Short answer: Yuka is best if you want a fast, free, traffic-light score on packaged groceries in European supermarkets. SYE is best if your diet has constraints that change what “healthy” means for you — diabetes, celiac, severe allergies, pregnancy, keto — and you also want to scan restaurant menus or compare products head-to-head. Most people get the most value from using both, with Yuka as the default and SYE for situations where personalization actually matters.
This comparison is written by the developer of SYE. That makes it not neutral — but it’s accurate, because the answer to “which app should I use?” really does depend on your situation, and it’s worth your time to know which is which.
Quick comparison at a glance
| Feature | Yuka | SYE |
|---|---|---|
| Founded | 2017 (France) | 2026 (rewrite of older Flutter app) |
| Free tier | Yes, full barcode scanning | Yes, 3 scans/day all features |
| Premium | €9.99/year (annual only) | $2.99/month |
| Platforms | iOS + Android | iOS only (Android in roadmap) |
| Barcode scanning | ✓ | ✓ |
| Restaurant menu scanner | ✗ | ✓ (unique) |
| Whole-shelf aisle scan | ✗ | ✓ (unique) |
| Side-by-side product comparison | ✗ | ✓ (unique) |
| Personalized score by diet/condition | Limited | ✓ Full (age, BMI, conditions, allergens) |
| Allergen derivative matching | Surface-level | ✓ 100+ allergens with derivatives |
| Cosmetics scanning | ✓ | ✗ |
| Family / multi-profile | ✗ | ✓ (CloudKit sync) |
| Account required | ✓ | ✗ (no signup, no email) |
| Database size | ~3M products curated | 4M+ via Open Food Facts |
What is Yuka, and why is it everywhere in France?
Yuka is a French barcode-scanning app launched in 2017 by François and Benoît Martin and Julie Chapon. Point your phone at a packaged food’s barcode and it returns a 0–100 score with a green/yellow/orange/red color, plus a short reason (“too much salt”, “contains an additive classified as risky”). The same app rates cosmetics on similar criteria.
The app reached around 40 million users by 2024, mostly in France, Belgium, Spain, and Germany. Brand reformulations driven by Yuka pressure are now a documented phenomenon — for example, Intermarché reformulated 900 products between 2018 and 2020 in part to improve Yuka scores (source: Le Monde).
That’s the cultural footprint, and it’s real. If you live in a country where Yuka is widely used, the app’s coverage of local supermarket products is excellent.
What is SYE, and why does personalization matter?
SYE — short for Should You Eat It? — is an iOS food scanner that calibrates every score to your profile. You enter your age, sex, BMI, diet (vegan, keto, paleo, Mediterranean, low-FODMAP, etc.), allergens (with full derivative coverage), and any health conditions you want factored in (type 1 or 2 diabetes, celiac, IBS, pregnancy, gestational diabetes, hypertension, kidney disease, and more).
Every scan after that is calibrated for you specifically. The same Nutella jar produces three different verdicts:
- 25-year-old triathlete profile: “CONSIDER. High sugar but acceptable as occasional pre-workout fuel.”
- Type 2 diabetic profile: “AVOID. 56g sugar per 100g will spike blood glucose well past target.”
- Parent of a tree-nut-allergic child: “DANGER. Contains hazelnuts (tree nut). Severe allergic reaction risk.”
That’s the difference. Yuka asks “is this product healthy in general?” SYE asks “is this product right for you?”
Yuka’s strengths
The app is dominant for good reasons. Here’s what it does better than almost any competitor:
- Massive curated database. Yuka has manually verified millions of products on top of Open Food Facts. In a French or Belgian supermarket, scan rate hits ~95%.
- Simple traffic-light visuals. No reading required. The color is the answer.
- Cosmetics scanning. Yuka rates cosmetic ingredients on toxicity and allergen risk. SYE doesn’t do this.
- Cross-platform. iOS and Android both supported.
- Brand pressure. Yuka has measurably moved the food industry in France. That’s not nothing.
- Free for the core experience. You can use the barcode scanner indefinitely without paying.
If your need is “scan a barcode in a supermarket and get a fast, simple verdict on whether the product is generally healthy,” Yuka is excellent.
Where Yuka falls short
Real limitations that matter for some users:
1. The score is the same for everyone
This is the big one. Yuka’s score doesn’t change based on who’s holding the phone. A 25-year-old triathlete and a 65-year-old type 2 diabetic see identical “Bad” verdicts on a Coke. That’s accurate at the population level but misleading for anyone whose dietary needs differ from the average. Read why this fails diabetics in our generic-scoring breakdown.
2. Barcode-only
Yuka works on packaged products. You can’t:
- Photograph a restaurant menu and ask “what’s safe for me?”
- Photograph a fresh-produce shelf or bulk-bin section
- Scan an entire grocery aisle to compare 20 yogurts at once
If your scanning needs go beyond packaged groceries, Yuka has nothing for you.
3. Allergen detection is surface-level
Yuka catches the headline allergens (gluten, lactose, nuts) when they’re explicitly labeled. It struggles with derivatives: ingredients that contain the allergen but use a different name. “Casein” is dairy. “Modified food starch” can be wheat-derived. “Carmine” isn’t vegan. SYE maintains a 100+ allergen derivative reference and matches them automatically.
4. No comparative scanning
Standing in front of two protein bars trying to decide between them? You scan one, then the other, then mentally compare. SYE’s Quick Compare does the comparison for you and tells you which fits your profile.
5. Account required + ad-supported
Yuka requires an email signup to use the app. Premium ($9.99/year) removes ads and adds long-term tracking. SYE has zero accounts, no tracking, no ads on any tier.
Where SYE wins
1. Personalized scoring (the core difference)
Already covered above, but worth restating: every score is calibrated for your profile. This is the point of the entire app.
2. Restaurant menu allergen detection
Photograph any restaurant menu. SYE’s vision AI extracts each dish, infers likely allergens from typical preparation, and flags items containing what you’ve marked. Gluten, nuts, dairy, shellfish, eggs, sesame, soy, sulfites — whatever you’ve configured. We wrote a celiac restaurant survival guide showing the workflow end-to-end.
This feature is unique to SYE. No competitor in the food scanner category ships it. For users with severe allergies, the experience changes from “interrogate the waiter and hope” to “photograph the menu, scan, order with confidence.”
3. Quick Compare (head-to-head)
Scan two products, get a side-by-side breakdown plus a clear winner — calibrated for your profile. Stand in the cereal aisle, scan two boxes, see which has less sugar relative to your goals.
4. Aisle Scan
Photograph an entire supermarket shelf. SYE identifies every visible product, ranks them by fit to your profile, and labels the top three with gold/silver/bronze badges. Useful when you’re choosing among 20 yogurts or 30 granola bars.
5. 100+ allergens with derivative matching
The matching engine knows that “casein”, “whey”, and “lactose” all relate to dairy; that “modified food starch” can hide wheat; that “carmine” comes from insects (not vegan). Yuka catches the obvious labels — SYE catches the hidden ones.
6. Family profiles
Multiple profiles in one app, each with its own diet/conditions/allergens, synced via CloudKit. Useful for households where the parent has hypertension, the kid has a peanut allergy, and the partner is keto. Yuka has no equivalent.
7. Privacy by design
No accounts. No email collection. No ad networks. No analytics that track you across apps. Your profile lives in your private iCloud (or locally on the device if you don’t use iCloud). The only thing leaving your phone is the scan request, which goes to a Cloud Function that processes and discards immediately.
What SYE doesn’t do (yet)
Honest list:
- No Android app. iOS only. On the roadmap, no firm date.
- Smaller user base. SYE launched in 2026. Yuka has 8 years of user-driven brand pressure that we don’t.
- No cosmetics scanning. Yuka does this; we don’t.
- Smaller European brand footprint. Yuka has hand-curated millions of European local products. SYE relies on Open Food Facts (4M+) which is more global but slightly thinner on niche regional brands.
If any of those are deal-breakers, Yuka is the right choice. It’s free, it works, and it’s an easier recommendation if your dietary needs are average.
Which app should you pick?
Use Yuka if you…
- Shop primarily in European supermarkets and want maximum local product coverage
- Don’t have specific dietary conditions (no diabetes, no severe allergies, no celiac, no kidney disease, etc.)
- Also want to scan cosmetics
- Are on Android (SYE is iOS-only as of 2026)
- Want a fast, no-thinking experience without setup
Use SYE if you…
- Have a dietary condition that makes generic scores misleading: diabetes, celiac disease, IBS, kidney disease, hypertension, gestational diabetes, severe allergies
- Eat at restaurants and want allergen detection on menus
- Want to compare two products head-to-head before buying
- Scan whole shelves to pick the best of many similar products
- Manage food for multiple family members with different restrictions
- Care about not having an account / no email collection / no ad tracking
- Are on iOS
Use both if you…
Honestly, that’s reasonable. Yuka for daily scanning of common European supermarket products where personalization doesn’t matter. SYE for restaurants, sensitive purchases, and anything where your specific profile changes the answer.
The apps aren’t mutually exclusive. They’re optimized for different parts of the same problem.
How accurate are these apps, really?
Both apps source product data largely from Open Food Facts, the open database with 4M+ products. The scoring algorithms are different:
- Yuka uses a proprietary algorithm weighting nutrition (60%), additives (30%), and organic certification (10%), then applies a 0–100 grade.
- SYE uses Google Gemini Vision for menu/aisle analysis, layered with deterministic Nutri-Score and NOVA classification, then adjusted per user profile.
Both apps will occasionally be wrong on specific products — usually because Open Food Facts has incomplete or outdated ingredient lists. If accuracy on a specific product matters, cross-reference the actual ingredient list on the package.
Frequently asked questions
Is Yuka or SYE better for diabetics?
SYE is better for diabetics because its scoring incorporates your blood-glucose constraints (carb load, glycemic index, sugar substitutes) directly into the score. Yuka uses a population-average algorithm that flags Coke as bad for everyone equally — useful as a general signal, not actionable as a diabetes management tool.
Does SYE replace Yuka?
No. Yuka has a stronger product database in Europe and a free tier with no scan limit. SYE adds personalization, restaurant menu scanning, and head-to-head comparison that Yuka doesn’t offer. Most users with specific dietary needs benefit from running both.
Are Yuka and SYE free?
Both have free tiers. Yuka’s free tier includes unlimited barcode scans with ads. SYE’s free tier includes 3 scans per day with all features (Aisle Scan, Quick Compare, Menu Detection). SYE Pro at $2.99/month removes the daily cap.
Does Yuka scan restaurant menus?
No. Yuka only scans barcoded packaged products. SYE is the only mainstream food scanner that scans restaurant menus and detects allergens in cooked dishes.
Is my data private with Yuka and SYE?
SYE has no accounts and stores your profile locally + in your private iCloud. Nothing is linked to your identity. Yuka requires an email signup; consult their privacy policy for retention specifics.
Can I use Yuka or SYE for my kid’s allergies?
Both can flag allergens, but SYE’s allergen engine is more thorough. SYE supports family profiles (one app, separate child/parent settings) and matches 100+ allergens including derivative names. Yuka has surface-level allergen flagging without family profiles.
Why is SYE not on Android yet?
Resources. Building two native apps in parallel is a significant undertaking for a solo developer. Android is on the roadmap; no committed date. If Android matters to you and you have specific dietary needs, Yuka is the right pick today.
The bottom line
Yuka is excellent at what it does: fast, free, generic scoring on European supermarket products. SYE is excellent at a different job: personalized scoring for people whose diet is shaped by a condition or allergy, plus restaurant menus and aisle comparisons that no competitor offers.
If you have type 2 diabetes, celiac disease, severe allergies, or are pregnant — SYE will give you better answers because the scores are calibrated to you. If you’re a healthy adult shopping in a French supermarket who just wants a quick traffic-light verdict on a snack — Yuka is hard to beat and works fine.
Most people benefit from having both apps installed. They don’t compete; they complement.