Kairo vs Yazio
An honest, side-by-side look at how Kairo and Yazio compare — verified from real App Store listings and reviews (June 2026). Here's where Kairo comes out ahead.
Published accuracy
Reproducible benchmark vs USDA + Open Food Facts at /accuracy
Zero ads, no upsell
One subscription, no second Premium tier — everything included
Photo-AI + Body Map
AI photo scan is the core; food mapped to six body systems
EU/GDPR, German-built
EU-hosted, Centaurio UG, data cross-referenced with DGE + USDA
Kairo wins on accuracy you can check (a published, reproducible photo-AI benchmark), zero ads, and one all-in subscription with no second Premium tier; Yazio is the better fit if you specifically want a large European food database with intermittent fasting, recipes, and Android plus a web app.
Kairo is the AI calorie tracker that publishes how accurate it is. Most apps hand you a number and ask you to trust it; Kairo publishes a reproducible benchmark against USDA and Open Food Facts at kairocalories.com/accuracy — so you can check the method, not just the result. Photo-AI meal scanning is the core of the app, not a bolt-on, and there are no ads and no second "Premium" tier: the photo-AI, barcode scanner, full macros, Body Map and groups are all in one subscription, with no upsell mid-flow. It's also a tracker you'll actually open — a mood cat that reacts to your week, a Body Map that shows how your food feeds six body systems, and a metabolism that learns your real maintenance from your own weight trend. See the numbers for yourself at /accuracy. → Accuracy
Side by side
| Feature | KairoThis app | Yazio |
|---|---|---|
| Published accuracy benchmark | Yes — a reproducible benchmark on the full production photo path at kairocalories.com/accuracy: 16/16 test meals inside a ±20% per-100g gate, ~96% weighted-macro accuracy, scored against USDA + Open Food Facts (a fabricated source can't pass the scorer). | No published accuracy test; Yazio's own help center frames its photo results as an approximate estimate, not a guaranteed figure. |
| Third-party ads in the app | Yes — none, ever; the same clean experience from the first day, no ad-free upsell. | Ad-supported free tier — reviewers report ads after logging meals and frequent upgrade prompts; an ad-free experience is sold as a PRO benefit. |
| Photo-AI as the core flow | Yes — photo-AI is the core of the app, built into the single subscription from day one, not an add-on. | Has a photo AI, added in late 2025; independent 2026 reviews report it is PRO-gated in most markets, layered onto a manual logger. |
| Everything in one subscription, no second tier | Yes — one plan includes photo-AI, the barcode scanner, full macros, the Body Map and groups; there is no higher Premium tier to upgrade to. | Tiered — PRO gates photo logging, intermittent fasting, recipes, detailed nutrient breakdowns and an ad-free experience above the free tier. |
| Detailed nutrient breakdown for every meal | Yes — full calories and macros are shown for every analyzed meal, included in the subscription. | Detailed nutrient breakdowns (fiber, sugars, vitamins) are reported as blurred behind a PRO badge for free users. |
| EU/GDPR + German company & data | Yes — EU/GDPR-hosted, German company (Centaurio UG, Hofheim am Taunus), data cross-referenced with German DGE references + USDA, native German (du-form). | Also a German EU/GDPR company (YAZIO GmbH, Erfurt), majority-owned by France's Groupe SEB since 2023 — so EU operation isn't a Kairo-only point. |
| Body Map (nutrition → 6 body systems) | Yes — maps your nutrition onto 6 plain-language body systems (brain, heart, muscles, bones, digestion, immune). | No body-system view. |
| Metabolism that learns your real maintenance | Yes — adapts your target from your actual weight trend plus intake, not just a one-time formula. | No maintenance estimate that learns from your weight trend. |
| Free tier / cost to start | Subscription-only — Kairo asks you to subscribe up front; the full-price annual plan includes a 3-day free trial, and the price is shown before you buy. | Has a genuinely free, ad-supported tier you can keep using for manual logging, plus a 7-day PRO trial — a lower-cost way to start than Kairo. |
| Food database, fasting & recipes | Photo-AI estimates the meal directly plus a barcode scanner; DGE/USDA-cross-referenced numbers rather than a large catalog. No fasting tracker or recipe library. | Large food database with strong European-brand coverage, built-in intermittent fasting, and 2,900+ recipes with meal plans. |
| Platforms & languages | iOS-only by design (iPhone, Apple Watch, widgets), native English + German. | iOS, iPadOS, Android and a web app, in 20 languages. |
Published accuracy benchmark
Kairo
Yazio
Third-party ads in the app
Kairo
Yazio
Photo-AI as the core flow
Kairo
Yazio
Everything in one subscription, no second tier
Kairo
Yazio
Detailed nutrient breakdown for every meal
Kairo
Yazio
EU/GDPR + German company & data
Kairo
Yazio
Body Map (nutrition → 6 body systems)
Kairo
Yazio
Metabolism that learns your real maintenance
Kairo
Yazio
Free tier / cost to start
Kairo
Yazio
Food database, fasting & recipes
Kairo
Yazio
Platforms & languages
Kairo
Yazio
Feature details verified from each app's App Store listing & official site (June 2026).
Why some switch to Kairo
Frequently reported Yazio gripes — stated neutrally, each with a source.
Several 2026 third-party reviews describe once-free functionality — notably the AI photo scan, and at times the barcode scanner — as moved behind the PRO paywall, with the free tier described as feeling like a limited trial. [source]
Free-tier users report frequent ads after logging meals and repeated upgrade prompts, including time-limited-discount urgency, and an ad-free experience is itself sold as a PRO benefit. [source]
Some reviewers say the daily streak and post-meal healthy-tip prompts feel judgy and report not finding a way to disable them, which they describe as unhelpful for users with an eating-disorder history. [source]
A method you can verify beats a number you're told to trust. Kairo is newer and has fewer ratings than the established players — but the accuracy benchmark, the EU/GDPR hosting and the German company behind it (Centaurio UG, Hofheim am Taunus) are all checkable today, and the German App Store rating is 4.6 from real users. Built clean in 2026: no ads, no second Premium tier, no crowd-edited database drift. The review count comes with time; the proof is already public.
FAQ
Is Kairo more accurate than Cal AI or MyFitnessPal?
We don't make that claim — it would need a controlled head-to-head test, and we haven't run one. The verifiable difference is disclosure: Kairo publishes a reproducible accuracy method and its results against USDA FoodData Central and Open Food Facts at kairocalories.com/en/accuracy. Our internal 16-meal benchmark (June 2026, full production photo path) shows about 3.5% mean per-100g calorie error on branded items versus labels, while generic whole foods are honestly harder (apple 9.9%, chicken breast 10.1%). It's a small internal benchmark, not a competitor head-to-head — and since the other apps don't advertise comparable figures, we compare on disclosure, not numbers.
What does Kairo do that these apps don't?
Four verifiable things. It publishes a reproducible accuracy benchmark against USDA and Open Food Facts — most trackers ask you to trust a number instead. It runs with no ads and has no second Premium tier: the photo-AI, barcode scanner and full macros are all in the one subscription. It hosts your data in the EU under GDPR, built by a German company (Centaurio UG) with food data cross-referenced against DGE reference values. And it adds a Body Map across six body systems plus an adaptive metabolism that learns your real maintenance from your weight trend. It also includes Apple Health, a native Apple Watch app, widgets, group challenges and streaks. iOS-only; a subscription app with a 3-day free trial on the yearly plan.
Are these apps free, and are they on iPhone?
All six are on iOS. On cost, they split: MyFitnessPal, Yazio, Cronometer and Lose It! have free ad-supported tiers you can use without paying, while Kairo and Cal AI are subscription apps you subscribe to in order to use. Kairo's plan includes a 3-day free trial on the yearly option with the price shown before you buy. What sets Kairo apart is that it runs with no ads and no second Premium tier — the barcode scanner and full macros are part of the one subscription, not a paid upgrade. For each app's current pricing, check its App Store listing.
Kairo is newer — why pick it over an established app?
Because new means no legacy debt: Kairo is built clean in 2026, with no ads, no second Premium tier, and food data sourced from DGE and USDA rather than crowd-edited entries. We'd rather give you a method you can check than a number you're asked to trust — the accuracy benchmark, the EU/GDPR hosting and the company behind it (Centaurio UG) are all verifiable today, and the German App Store rating is 4.6 from real users. Each app it's compared to has one specific moat (a larger database, a web app, Android, per-nutrient depth, or a free tier); pick those if that one thing is what you need.
Download Kairo free on iPhone — photo-AI tracking, the Body Map and an accuracy method we publish in full.
Download on the App Store