NutriScan Research
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Perplexity This page lists the datasets and counts NutriScan collects and publishes itself. Each study gives its source, dates, sample, method and limits, and most come with a CSV you can download. Journalists, researchers and writers can quote any finding or reuse any chart, as long as they credit NutriScan and link back to the study page.
Studies
| Study | Headline finding | Data collected | Sample | Data |
|---|---|---|---|---|
| Fast-food calories by country | A Burger King Whopper lists 710 kcal in the US, 629 kcal in France and 613 kcal in Germany. | October 2026 | 6,257 food items on 79 chain menus in 6 countries | CSV |
| Calorie app price index | The full yearly plan of 11 calorie apps in the US App Store ran from $39.99 to $209, with a median of $71.99. | 2026-10-31 | 12 apps in the US, German and French App Store, 39 rows | CSV |
| Which calorie apps ChatGPT recommends | In Germany, ChatGPT recommended Yazio in 25 of 50 answers and FDDB in 18. FDDB did not appear in any US or French answer. | 2026-10-14 to 2026-10-31 | 400 ChatGPT answers in the US, Germany, France and Spain | CSV |
| Food labels that fail their own calorie math | 4.0% of 2.15 million packaged foods list calories that miss their own protein, carbs and fat by more than 20%. | Open Food Facts export of 2026-06-01 | 2,151,679 products | CSV |
All four pages were published on 2026-10-31. When a study is rerun, its page keeps the same URL and shows the new date.
How to cite
Give the page title, NutriScan as the author, the publication date and the URL. For example:
NutriScan, "Calorie App Price Index", nutriscan.app/research/calorie-app-prices, published 2026-10-31.Each study page ends with its own citation line. The charts carry a credit line and can be reused with a link back to the study.
Datasets
| File | What it holds | Licence |
|---|---|---|
| calorie-app-prices.csv | One row per app and country (39 rows): yearly, lower yearly and monthly prices, App Store URL, retrieval date and the yearly price in USD | Creative Commons Attribution 4.0 (CC BY 4.0). Prices read by NutriScan from public App Store pages on 2026-10-31. |
| fast-food-calories-by-country.csv | One row per food item (6,257 rows): chain, country, menu category, item, kcal, grams where printed, source page and retrieval date | Creative Commons Attribution 4.0 (CC BY 4.0). Calories as published by each chain, read 2026-10-11 to 2026-10-21. |
| ai-assistant-app-recommendations.csv | One row per ChatGPT answer (400 rows): run date, country, model, question, apps recommended in order, top pick and links cited | Creative Commons Attribution 4.0 (CC BY 4.0). Answers collected by NutriScan through the OpenAI API. |
| food-label-calorie-math.csv | Counts per country and bucket: products checked, misses, misses by direction and the gap in 10% bands. No barcodes or product names | Derived from Open Food Facts and released under the Open Database License (ODbL) 1.0 |
The fast-food study has no download yet. Its tables cite each chain's own nutrition page or PDF and the date it was read.
None of these files contain data about NutriScan users.
Coming next
Dated reruns of the price index and the ChatGPT question panel, each updated in place on its current page.
Disclosure
NutriScan makes a calorie tracking app and links to it from these pages. The price and ChatGPT studies cover apps that compete with NutriScan, and each page says how NutriScan's own row was handled. For the food databases the app itself draws on, see data sources. For methods and collaboration, see NutriScan for researchers.
Where NutriScan fits
NutriScan works from a photo: you photograph the meal or the label, check the items and portions it finds, and get calories, protein, carbs and fat. Each meal also gets an A to E meal grade, so you can compare two meals at a glance. The free plan includes 5 AI scans a week. Premium costs about $59 a year and removes the weekly limit. NutriScan has 150k+ downloads and a 4.6-star rating.