YAZIO vs Simple 2026: Fasting Plus Coaching Comparison โ
ChatGPT 
Claude 
AI Mode 
Perplexity 
A 2023 meta-analysis in the Journal of Medical Internet Research by Chew et al. pooled 14 randomised trials and 2,478 participants testing a self-monitoring app combined with coaching or counselling. The combined approach beat usual care by 2.15 kg of weight loss and 128 kilocalories a day (Chew et al., JMIR, 2023). The authors are careful about the comparison: the weight-loss advantage held against usual care, not against an app used on its own. Structured support on top of tracking is what moved the number.
As a NutriScan nutritionist, I see this split every week: some users want a fasting timer plus detailed food numbers, some want a coach who tells them what to change. In 2026, YAZIO and Simple sit at opposite ends of that spectrum, yet both hold a 4 out of 5 score in Fortune's 2026 intermittent fasting app roundup.
Short verdict: YAZIO PRO wins for users who want calorie data alongside their fasting timer. It runs about $23.90 to $47.90 for twelve months depending on the offer you land on, breaks nutrients down into fatty acids, fiber, sugar, salt, vitamins and minerals, and carries 20 fasting trackers. Simple Premium wins for users who want an AI coach to manage habits and fasting together without logging every gram of food.
IMPORTANT
Your YAZIO vs Simple comparison plan at a glance.
A quick roadmap so you know where this comparison is going.
โฑ๏ธ Progress 0/4 โข ~0 minutes in โข Keep going
โณ Step 1: Who each app is built for
โณ Step 2: Fasting features and food tracking head-to-head
โณ Step 3: Coaching, pricing, and wearable sync
๐ The one behavior pattern that predicts which app you'll actually stick with (revealed near the end)
Choosing between YAZIO and Simple without a clear framework feels exactly like this
The Two Apps Side by Side ๐ โ
Here is the overview most comparison articles skip.
| Feature | YAZIO PRO | Simple Premium |
|---|---|---|
| Annual price | $23.90 to $47.90 per 12 months, both SKUs live | $59.99/year |
| Monthly price | $11.90 SKU, no duration printed by Apple | $29.99/month per Fortune |
| Free tier | Yes - calories + 3 macros, barcode scanner, 16:8 timer | Yes - 2 Avo AI replies/day, 1 photo scan/day |
| Fasting programs | 20 trackers, 16:8 free and the other 19 on PRO | Schedule assigned from onboarding answers |
| Food database | 4M+ foods, barcode, AI photo (PRO) | No searchable database - description or photo |
| Calorie tracking | Full, plus fatty acids, fiber, sugar, salt, vitamins, minerals | Estimated from a photo or description |
| AI coaching | No - data only | Yes - Coach Avo, unlimited in Premium |
| Habit workbooks | No | Sold separately, $29.99 bundle, not in Premium |
| Daily check-ins and streaks | No | Yes - Premium |
| Recipes | 3,000+ in PRO | No browsable library, Avo suggests on request |
| Wearable sync | Fitbit, Garmin, Polar, Samsung Health (Android) | Apple Health, Google Fit |
| App Store rating | 4.7/5, 50K ratings | 4.7/5, 393K ratings |
| Fortune 2026 pick | Best IF App with Calorie Tracking | Best IF App Overall |
Prices are standard US prices as of mid 2026 and change by region. Both listings carry several concurrent SKUs, so the figure you see at checkout depends on the offer you are shown. Store ratings checked 7 August 2026.
The table tells the story: YAZIO gives you more data tools, and Simple gives you more coaching tools. Neither app tries to be the other.
IMPORTANT
Checkpoint: here's where you are right now.
Quick status update so you always know the next best move.
โฑ๏ธ Progress 1/4 โข ~1 minute in โข Keep going
โ Step 1: Side-by-side overview (done)
๐ Step 2: Fasting features and food tracking (you're here)
โณ Step 3: Coaching, pricing, and wearable sync
๐งฉ The behavior pattern that predicts long-term success (coming soon)
Who Each App Is Built For ๐ฏ โ
YAZIO was built for the data-focused faster. The core user wants to know exactly how many calories went into their 8-hour eating window, track protein against a target, and see whether the fasting schedule is connected to progress. YAZIO started in Erfurt, Germany in the early 2010s as a straightforward calorie counter and added fasting features later (YAZIO, About Us). The fasting tools feel like a natural add-on to a calorie tracking foundation, because that is exactly what they are.
Simple was built for the habit-focused faster. The core user finds calorie counting demotivating, wants an AI to check in on them, and prefers guidance over dashboards. Simple's coach, Avo, won Best Virtual Health Coach in the 2025 MedTech Breakthrough awards, which tells you where the company puts its effort.
Worth knowing before you download it: Simple has moved away from fasting as its headline. The App Store listing is now titled "Simple: AI Weight Loss Coach" and its published feature list runs Avo coaching, Avo Vision photo feedback, workout plans, the Blinky motivation character, quick logging and Apple Health sync, with fasting named nowhere (App Store). Fasting survives as a logging category and as one of five inputs to the Success Score. Fortune still ranks it the best fasting app overall, but you are buying a weight-loss coach that handles fasting, not a fasting app with a coach bolted on.
Which type are you?
If you have quit calorie-counting apps before because logging felt like homework, Simple's approach removes most of that friction. If you have quit because you did not see results from your effort to log everything, YAZIO's data helps you diagnose exactly what went wrong.
Three Real-World User Scenarios โ
Scenario 1: The calorie-aware faster. Maria, 34, has run 16:8 for three months and stalled. She suspects she is overeating in her window but not by how much. YAZIO PRO answers that: database search, barcode, or the AI photo scanner. Simple would not, because it does not show granular calorie data.
Scenario 2: The habit builder. James, 28, quit two calorie trackers because logging felt like homework. Simple Premium suits him. Coach Avo AI answers his questions without a cap, daily check-ins and streaks give him something to keep, and the Success Score grades the day without a calorie total. YAZIO's free tier would frustrate him the same way the other apps did.
Scenario 3: The protocol experimenter. Priya, 41, has read about 5:2, 16:8 and 12:12 and wants to try each one systematically. YAZIO's Fasting tab carries 20 trackers with reminders and guidance attached to each. Simple assigns her one schedule from her onboarding answers and coaches around it. For structured protocol exploration, YAZIO wins by a clear margin.
Fasting Features: More Programs vs Better Coaching โฑ๏ธ โ
YAZIO Fasting Programs in PRO โ
YAZIO's Fasting tab carries 20 fasting trackers. The 16:8 program sits in the free app; the other 19 need PRO (YAZIO, app tutorial). YAZIO names four of them on its own pages:
- 16:8 - the most popular protocol, 16 hours fasting and 8 hours eating, and the one that is free
- 12:12 - the gentlest entry point, an even split
- 5:2 - 5 normal eating days and 2 reduced-calorie days per week
- 1:1 - alternating fasting and eating days
YAZIO does not publish the full list of 20, so the rest you find by opening the tab. Each tracker comes with meal-timing reminders and guidance on ketosis, autophagy and energy use, and you can activate, adjust or cancel a fast at any time (YAZIO, fasting tracker).
Simple Fasting Approach โ
Simple assigns you an initial fasting schedule from your onboarding answers rather than handing you a library of named protocols to pick between (Mitri, EverydayHealth). The differentiation is what happens around the timer: unlimited Avo replies, daily check-ins with streak tracking, smart feedback on meals and weight, and the Success Score pulling your fasting routine into one daily number (Simple, subscription plans).
Simple also sells PDF workbooks covering intermittent fasting, healthy nutrition and workouts. Read the small print here: they are a separate purchase offered at checkout alongside Premium, priced as their own $29.99 App Store bundle, and Simple's Premium FAQ describes them as optional and skippable (Simple, Premium FAQs). A Premium subscription on its own does not include them.
Still building to the behavior insight
2 down, 2 to go. Hang on - the behavior pattern that predicts long-term app success is coming near the end of this comparison. It changed how I recommend apps to clients.
Verdict on fasting: YAZIO has the protocol variety, 20 trackers against one assigned schedule. Simple has the coaching around the habit. If you want to work through protocols, YAZIO wins. If you need accountability to stay consistent, Simple wins.
Food Tracking and Calorie Counting ๐ฅ โ
This is the biggest functional difference between the two apps.
YAZIO Food Tracking โ
YAZIO is a calorie tracking app first. Its own store listing puts the database at over 4 million searchable items covering packaged products, restaurant items and whole foods (Google Play). It publishes no breakdown by region or market, so treat coverage for your own shopping list as something to test rather than something to assume. You can log by text search, barcode scan, custom entry, quick-add favorites, and AI photo scan (PRO only, despite the app now being named AI Calorie Tracker by Yazio on both stores).
PRO adds advanced nutrient breakdowns on top of the basic calorie, protein, carb and fat view, covering fatty acids, fiber, sugar, salt, vitamins and minerals (YAZIO PRO). YAZIO does not publish a nutrient count, so a specific number is not something anyone can quote honestly. Meal plans let you pre-plan your eating window, and the recipe library holds over 3,000 recipes created and tested by YAZIO's nutrition team.
The AI photo scanner in PRO is a useful shortcut for common foods. A 2024 scoping review in JMIR found that AI food detection tools reach 74 to 99.85 percent accuracy depending on the food type, with nutrient estimation errors between 10 and 15 percent (Zheng et al., JMIR, 2024). YAZIO's scanner handles standard meals well and struggles with mixed dishes, which matches that range.
Our meal scan guide goes deeper on how photo logging accuracy varies across nutrition tools.
Simple Food Tracking โ
Simple does not have a searchable food database. Fortune's tester listed "no direct food logging or recipe database" as a con (Fortune), which is shorthand for the missing database rather than a claim that you cannot log a meal at all: Simple's own help centre documents logging food, water, activity and weight. What you do is take a photo or type a description like "chicken salad with dressing and crackers", and Avo estimates the nutrition from that.
What comes back is the Success Score, not a calorie total. It runs on a colour-banded scale from red through orange, green and blue-green, positioned against 50 as the pivot, and it is built from five behaviours: food quality, water intake, physical activity, fasting routines and weigh-ins (Simple, Success Score). Simple gates it to Premium.
That works if you want general feedback. If you need real numbers, say protein to 150 grams a day, Simple cannot give you reliable data for it.
Verdict on food tracking: YAZIO wins clearly. If calorie counting and macro tracking are part of why you are fasting, YAZIO is the only real option between the two.
IMPORTANT
Checkpoint: midway progress update.
You're halfway - the key decisions get clearer here.
โฑ๏ธ Progress 2/4 โข ~2 minutes in โข Keep going
โ Step 1: Side-by-side overview (done)
โ Step 2: Fasting features and food tracking (done)
๐ Step 3: Coaching, pricing, and wearable sync (current)
โณ The behavior pattern that predicts long-term success (next)
Coaching and Habit Tools ๐ค โ
YAZIO Coaching โ
YAZIO does not offer coaching in the traditional sense. Fortune's tester Pete scored YAZIO 2 out of 5 on accountability, noting no community features and no personalised coaching (Fortune). There are no chat features, no AI conversations and no habit tasks. The app tracks your data and shows you progress charts. The educational content inside each fasting program gives background on how intermittent fasting works, but it does not adapt to your individual behavior.
If data is your feedback loop, that is fine. If you need external check-ins, you will feel the gap within a few weeks.
Simple Coaching โ
Simple Premium includes Coach Avo AI, a text assistant you can message for nutrition advice, recipe ideas, fasting strategy and general wellness questions. Fortune's tester found the AI assistant helpful for questions and for guidance on healthy recipes, workout ideas and improving meal scores (Fortune).
The workbooks cover fasting and nutrition topics across multiple structured lessons and feel closer to a short course than a help article, but they are a separate $29.99 purchase rather than part of the subscription. What Premium itself adds on the habit side is daily check-ins with streak tracking, smart feedback on meals and weight, and an educational library, all listed on Simple's own plan page.
Free caps Avo at two replies and one photo scan a day, which breaks the coaching loop. Premium removes both caps, which is why the upgrade matters more here than on YAZIO.
Verdict on coaching: Simple wins by a wide margin. Unlimited Avo replies, daily check-ins, streaks and the Success Score add up to a habit system. YAZIO offers data but no coaching.
Pricing in 2026 ๐ฐ โ
Figure 1: the SKUs that carry a stated duration. YAZIO's 12-month price is live at both $23.90 and $47.90; Simple Premium's annual SKU is $59.99, and paying Simple monthly at Fortune's $29.99 costs $359.88 over a year. YAZIO's monthly-equivalent bar is left off because Apple prints no duration on any YAZIO monthly SKU.
Prices are standard US prices as of mid 2026 and change by region.
YAZIO Pricing โ
| YAZIO SKU | What Apple labels it | Price |
|---|---|---|
| Free | - | $0 |
| YAZIO PRO | no duration printed | $11.90 |
| 3 Months | 3 months | $23.99 |
| 12 Months (promotional) | 12 months | $23.90 |
| 12 Months (list) | 12 months | $47.90 |
The App Store listing carries ten YAZIO SKUs at once, which is the part most comparisons miss. Two of them are labelled "12 Months", at $23.90 and at $47.90, so twelve months of PRO costs somewhere between about $2 and $3.99 a month depending on which offer you are shown. Fortune's own table puts it at "around $25 to $60 per year depending on plan and discounts". YAZIO sells a monthly-looking PRO SKU at $11.90, though Apple shows no duration label on it, so treat the monthly maths as approximate.
YAZIO also runs a standing 20 percent discount on the 12-month PRO subscription through its own promo page, applied automatically at checkout, and publishes no dollar figure alongside it (YAZIO Promo). There is a 7-day free PRO trial, but it runs occasionally and only through yazio.com, not inside the app (YAZIO help centre). Fortune's table reads "no traditional free trial" for exactly that reason, so a reader who downloads first will not find one.
Simple Pricing โ
| Simple SKU | Billing | Price |
|---|---|---|
| Free | - | $0 |
| Simple Premium (annual) | 12 months | $59.99 |
| Simple Premium (monthly) | monthly, per Fortune | $29.99 |
| Simple Pro | four SKUs, no duration printed | $14.99 to $49.99 |
Simple publishes no prices at all. Its own help centre says only that "the cost of the Simple Premium subscription varies based on the regular plans you select", and that a standard promo code, TOP70, is applied automatically (Simple, subscription plans). The App Store listing shows nine concurrent SKUs, of which a $59.99 Simple Premium is the annual anchor.
Two independent figures disagree on the monthly. Fortune puts Simple Premium at $29.99 a month (Fortune); Everyday Health's RD review, updated March 2025, says $15 a month, $9.99 a month on a three-month plan, and under $5 a month annually (Mitri, EverydayHealth). The annual figures agree. The monthly ones do not, and with nine live SKUs and an automatic promo code, that is what heavy promotional pricing looks like from the outside.
The Simple Pro row is there for completeness. Apple shows four Simple Pro SKUs at once, none duration-labelled, and Simple's help centre describes exactly two tiers, Free and Premium, with no Pro tier on it.
Check what you are actually signing up for
At Fortune's $29.99 a month, Simple costs $359.88 over a year against a $59.99 annual SKU. That is a six-fold gap for the same product, and it is the single biggest money decision in this comparison. Confirm the duration on the plan you are shown before you confirm the purchase, on either app.
Verdict on pricing: YAZIO PRO costs less on annual billing, and that holds across every SKU pair. How much less depends on the offer: against Simple's $59.99 the gap is about $12 at YAZIO's $47.90 list and about $36 at its $23.90 promotional 12-month price. At Fortune's monthly rate, Simple is the most expensive monthly plan among the six apps Fortune reviewed.
Wearable Sync and Platform Compatibility โ โ
YAZIO connects to: Fitbit, Garmin, Polar, and Samsung Health on Android (YAZIO PRO). YAZIO names Google Fit nowhere on its own pages, so ignore third-party roundups that list it.
Simple syncs with: Apple Health and Google Fit (Fortune).
If you own a Fitbit, Garmin or Polar device, YAZIO has a shorter path to your step and activity data. Simple needs Garmin and Fitbit data routed through Apple Health or Google Fit first.
Food database note
YAZIO publishes a size for its database, over 4 million searchable items, and nothing about how that coverage is distributed by region or cuisine. Neither does Simple, which has no searchable database at all. So test both on the foods you actually eat during the free week rather than trusting either claim. For global macro tracking, try our online macro calculator to set your targets before choosing an app.
Your eating window only works if the food choices inside it support your goal
Six Tips for Picking the Right App โ โ
IMPORTANT
Checkpoint: final stretch before the reveal.
One last nudge - the behavior insight is next.
โฑ๏ธ Progress 3/4 โข ~3 minutes in โข Keep going
โ Step 1: Side-by-side overview
โ Step 2: Fasting features and food tracking
โ Step 3: Coaching, pricing, and wearable sync
โจ The behavior pattern that predicts long-term success (about to reveal)
Six checkpoints for the app that fits your actual behavior, not your ideal one.
1. Start with your tracking history. Quit before because logging was too much effort? Simple's description-based logging removes some of that friction. Quit because tracking showed no results? YAZIO's data helps you diagnose why.
2. Test both free tiers for 5 days. YAZIO free gives you calorie tracking, three macros, the barcode scanner and the 16:8 fasting tracker. Simple free gives you two Avo replies a day and one photo scan a day. Five days on both, no payment. Which one do you open in the morning?
3. Decide whether you need wearable data. YAZIO connects to Fitbit, Garmin, Polar and Samsung Health directly. Simple works through Apple Health and Google Fit. If you own a Garmin or Fitbit device, YAZIO has the shorter path.
4. Check your eating window discipline. If your struggle is staying within the fasting window, Simple's daily check-ins and streaks may be more useful than a calorie log. If your struggle is not knowing whether your eating window meals are helping or hurting, YAZIO's tracking data is more useful.
5. Test the database on your own food. Search YAZIO for five things you ate last week before you decide. Simple has no searchable database, so it sidesteps the question and hands you an estimate instead of a number.
6. Use YAZIO's 7-day trial actively, if you can get one. It is offered occasionally and only through yazio.com, not in the app. If you land one, log at least three meals a day, try one fasting tracker, and open the recipe library. If you skip all three during the free week, you will skip them after paying too. The trial behavior predicts the paid behavior.
How to Get Started with Each App ๐ โ
Starting with YAZIO PRO (5 steps) โ
Step 1. Download YAZIO and complete the setup quiz: weight goal, activity level, dietary preferences, fasting interest.
Step 2. Navigate to the Fasting tab and browse the 20 trackers. For beginners, select 16:8, which is the one YAZIO leaves in the free app. Set your eating window start time.
Step 3. If you want PRO, check yazio.com for the 7-day trial first. It is offered occasionally and only on the website, so tapping "Upgrade" in the app will usually charge you rather than start a trial. PRO opens the other 19 fasting trackers, 3,000+ recipes, AI photo logging and the full nutrient breakdown.
Step 4. Log your first meal three ways: text search โก๏ธ barcode scan โก๏ธ AI photo. Barcode is fastest for packaged food. AI photo handles simple home-cooked dishes well.
Step 5. After 7 days, review your fasting history and the daily nutrient breakdown. If you opened the fasting tracker and food log consistently, twelve months of PRO is worth it at either the $23.90 or the $47.90 SKU.
Starting with Simple Premium (5 steps) โ
Step 1. Download Simple. The onboarding quiz is long: age, weight, dietary preference, eating habits, sleep, activity level, weight goal.
Step 2. Review the fasting plan Simple recommends based on your onboarding answers. The plan includes a fasting window start and end time with daily reminders. Set your preferred fasting hours.
Step 3. Send Avo your two free replies: one question about your fasting schedule, one about a meal you plan to eat. Useful or generic? That tells you whether the coaching style fits.
Step 4. Start Simple Premium if the Avo conversations feel helpful. The workbooks are offered as a separate purchase at checkout, so decide on that one on its own merits; you can skip it and still get Premium.
Step 5. After one week, review your check-in streak, your Success Score trend and your fasting consistency. If adherence improved, the $59.99 annual SKU delivers good value against $29.99 a month.
What Research Supports About These App Types ๐ฌ โ
Torres et al. tracked 792,692 users of two fasting apps for 52 weeks and found weight loss scaled with starting BMI and with hours fasted per day, with users at a BMI of 40 or above losing 13.9 percent of their starting weight by week 52. The retention figures are the part worth reading twice: 16.7 percent of users were still active at 13 weeks, 6.9 percent at 26 weeks, and 2.1 percent at 52 weeks (Torres et al., JMIR mHealth and uHealth, 2022). Whichever app you pick, the base rate says you stop using it. That is the problem the day-3 test below is trying to catch early.
A separate 2022 paper by Valinskas et al. concluded that the DoFasting app was an effective weight loss tool when used actively and sufficiently (Valinskas et al., BMC Nutrition, 2022). Read it with the disclosure attached: DoFasting is a commercial app and this is a retrospective review of its own users, not an independent trial. Active engagement is still the variable it points at.
A 2024 Cochrane review by Metzendorf et al. is the cold shower. It found the available evidence does not demonstrate a clear benefit from smartphone apps for adults or adolescents with overweight or obesity, and that comparisons against minimal intervention or personal coaching showed only minor effects, mostly not clinically significant (Metzendorf et al., Cochrane, 2024). It does not carve out a better-performing category of app for structured programs or coaching content, so neither YAZIO PRO nor Simple Premium can claim one. What the app can do is make it easier for you to keep going, which is a smaller claim than the marketing on either listing.
The One Behavior Pattern That Predicts Which App You'll Stick With โจ โ
The single best predictor of long-term app success is not which features the app has - it is how you behave during the first free week.
Specifically: the people who come back on days 3, 5, and 7 of the first week are the ones still logging months later. The people who open the app twice and stop have already told you the answer. This is what I see in client after client, and it sits comfortably next to the Torres retention curve, where nine in ten users are gone by week 26. Treat it as a pattern worth watching in yourself, not a published statistic.
What this means in practice:
YAZIO users who log at least one meal on days 3, 5, and 7 of their free trial are the ones who get value from the data. Users who open it on day 1, explore the database, and disappear on day 2 are not YAZIO users - they are people who should try Simple's lower-friction approach.
Simple users who complete their daily check-in most days of the first week are the ones who bond with the coaching format. Users who ignore the check-ins but keep the app open to look at the fasting timer are not Simple users. They want data, and would do better in YAZIO.
The practical test: open whichever free app you download on day 3 of your trial, with a specific intention in mind. If you open YAZIO to check a nutrient you actually care about, you are a YAZIO user. If you open Simple to ask Avo a question you actually have, you are a Simple user. Day 3 without a clear intention tells you more than any comparison article.
IMPORTANT
Recap: everything you covered in this comparison.
You finished it - save this for when you're deciding.
โฑ๏ธ Progress 4/4 โข ~5 minutes in โข Nicely done
โ Step 1: Side-by-side overview (YAZIO = data tools, Simple = coaching tools)
โ Step 2: Fasting features and food tracking (YAZIO wins on calories and protocols, Simple wins on coaching around the timer)
โ Step 3: Coaching, pricing, and wearable sync (Simple wins coaching, YAZIO wins price and direct Fitbit/Garmin)
โ The behavior pattern that predicts long-term success (revealed: your day-3 behavior in the free trial)
YAZIO vs Simple: The Final Comparison ๐ โ
| Your goal | Better choice |
|---|---|
| Track calories precisely | YAZIO PRO |
| Follow structured fasting protocols | YAZIO PRO |
| Build fasting habits with coaching | Simple Premium |
| Avoid calorie counting entirely | Simple Premium |
| Keep costs low | YAZIO PRO ($23.90 to $47.90 per 12 months) |
| Connect to Fitbit, Garmin or Polar | YAZIO PRO |
| Get AI conversation support | Simple Premium |
| A searchable food database | YAZIO PRO |
| Minimal logging effort | Simple Premium |
Conclusion โ
YAZIO and Simple both work for intermittent fasting in 2026. They fail at different things. Picking the wrong one off a top-10 list is how people quit an app after two weeks.
YAZIO PRO is the right choice if your fasting goal is connected to calorie awareness, if you want more than three macros, or if you prefer data over conversation. At $23.90 to $47.90 for twelve months, it is one of the most affordable full-featured calorie trackers with fasting built in.
Simple Premium is the right choice if you have tried calorie tracking apps and found the logging exhausting, if you respond better to a daily check-in than to numbers, or if an AI coach asking about your habits keeps you more accountable than a chart. Go in knowing it now sells itself as a weight-loss coach rather than a fasting app.
Still unsure? Five days on each free tier. Your day-3 behavior tells you more than any comparison article.
If you want a third option that puts photo logging and coaching in the same free plan, NutriScan gives you 5 photo scans a week, micronutrients and a NutriScore on every meal, 4 calls a week with Monika, its voice AI nutritionist, and a fasting timer, all at no cost. Premium adds unlimited scans and calls plus a 28-day personalized diet plan and a goal-based grocery list. The 7-day trial starts through your app store; whether a card is collected depends on your platform and region.
To set a calorie target alongside your fasting window, try our online macro calculator.
FAQ โ
Does YAZIO have a coaching feature like Simple?
No. YAZIO does not offer AI chat coaching, daily check-ins, or habit workbooks. It gives data feedback through nutrient tracking, fasting history, and progress charts. Fortune's tester scored YAZIO 2 out of 5 on accountability for that reason. Simple is the better choice if you want an AI coach that asks about your habits.
Can Simple track calories accurately?
Simple does not have a searchable food database. It estimates nutritional content from meal photos or text descriptions using AI, and returns a daily Success Score built from food quality, water, activity, fasting and weigh-ins rather than an exact calorie count. If accurate calorie tracking matters to your goal, YAZIO PRO with its 4M+ food database is a better fit.
Which is cheaper: YAZIO PRO or Simple Premium?
YAZIO PRO is cheaper on annual billing. Apple currently lists YAZIO 12-month SKUs at both $23.90 and $47.90, against a $59.99 Simple Premium annual SKU, so the gap runs from about $12 to about $36 a year depending on which YAZIO offer you land on. Both vendors run promotional pricing, so check the figure at checkout.
Which fasting app should a beginner start with?
For beginners who are new to calorie counting as well as fasting, Simple's low-friction approach is often easier to maintain in the first few weeks. Its AI coaching and daily check-ins reduce decision fatigue. Once the fasting habit is established, some users switch to YAZIO for more detailed nutrition tracking. For beginners who already know they want calorie data, YAZIO's 16:8 tracker is a clean starting point, and it is the one that does not need PRO.
Does YAZIO sync with Fitbit and Garmin?
Yes. YAZIO's own PRO page names Fitbit, Garmin, Polar and Samsung Health on Android. It does not name Google Fit. Simple syncs through Apple Health and Google Fit, so Fitbit and Garmin data has to route through those platforms first before it reaches Simple. Users with Garmin or Fitbit devices who want direct wearable integration should choose YAZIO.