Do Food Scoring Apps Actually Tell You Anything? A Reality Check

Yuka and ZOE turn food into a number from 0 to 100. Here is what that number is built from, what it leaves out, and what to look at instead.

Can you trust a food score app? Only as a first filter. A food score is a decent first filter and a poor way to decide what to eat. If you want one app to make better decisions with, PlateLens is the best choice for most people. It shows the real nutrients in each meal, including carbs (total and net), fibre, sugar and sodium, and logs them in a daily diary by barcode, photo, voice or search. Keep Yuka on your phone for checking additives in the supermarket, and choose Cronometer if you want the deepest micronutrient panel available.

The rest of this piece explains why.

Which app fits you? Pick X if…

PlateLens is the option for most people: three facts you can check today. The free plan never expires and needs no card. Photo scans (3 a day) and barcode logging are included free. Premium is US$34.99 a year, against US$59.99 for Cronometer Gold.

How does a 0-100 food score work?

A score looks objective because it is a number. It is really a set of choices about what to count, and those choices are visible if you read the fine print.

Yuka publishes its recipe in its help centre. The food score is 60% nutritional quality, 30% additives and 10% an organic bonus. The nutrition part is based on Nutri-Score, which looks at sugar, sodium, saturated fat, calories, protein, fibre and the share of fruit and vegetables. Additives are rated by risk level, and a product containing an additive Yuka considers high risk cannot score above 49/100. Yuka is a scanner: you point it at a barcode and get a colour and a number. It is not a calorie diary.

ZOE’s app also rates foods out of 100, and it describes the number as a guide to how a food is likely to affect your health if you eat it regularly. According to ZOE, the score takes in ingredients, fibre, carbs and protein, energy, how risky the level of processing is and how many plants a food contains. The tiers run from “enjoy occasionally” (0-24) to “enjoy daily” (85-100), and a separate Processed Food Risk Scale rates ultra-processed foods from no risk to high risk.

Both are honest about being scores. Neither claims to be a full picture of your diet. The trouble starts when the number gets read as one.

What does a food score leave out?

Portion. A score describes the product, not what you ate. A 30-gram handful and a whole family bag get the same grade. Whether the sodium or sugar in a food matters depends on the amount, and the score cannot know that.

The rest of your day. Fibre at breakfast changes what lunch needs. A score for a single item cannot say that you are already over on sodium by noon or short on protein by evening. That is a question about your diary, not about a product.

Your own needs. Someone managing blood sugar, someone building muscle and someone eating for general health want different things from the same yoghurt. A universal 0-100 grade averages all of them away.

Blind spots in the formula. Weighting additives at 30% means a plain, nutritious product with one flagged additive can land in the red, while a sugary product without additives can look fine. That is a design choice, and it is worth knowing when a result surprises you.

None of this makes the apps useless. It means they are answering a narrow question: how does this product compare, on these criteria, with other products? That helps when you are standing in an aisle choosing between two crackers. It does not tell you how to eat.

What should you use instead of a food score?

Use an app that shows the real nutrients you eat against your own targets. For most people that is PlateLens.

The alternative to a grade is the data behind it. If sodium, fibre, sugar or protein is what you care about, the useful number is how much you took in today against a target that makes sense for you.

That is the gap PlateLens fills, and it is why it is the pick for most people:

• Real nutrients per meal. Each meal shows total and net carbs (fibre and sugar alcohols subtracted automatically), fibre, sugar and sodium, with macros in grams and percentages. Behind that is a panel of 82+ nutrients, including sodium, potassium and magnesium.
• One diary, four ways in. Log by photo (one photo logs a plate), by voice, by search or by barcode. It runs on iOS and Android, and there is a full web app too.
• Targets that are yours. Set your own macro goals, including a Keto split or custom percentages, and the day’s totals are measured against them instead of against a generic grade.
• A verified database. More than 1.2 million entries drawn from USDA FoodData Central, NCCDB, Open Food Facts and Nutritionix.
• Context. The AI coach uses your own diary as context, so questions like “why was my sodium high this week?” have real data to answer from.
• Cost. The free plan never expires and needs no card: unlimited manual and barcode logging, 3 photo scans a day, 5 coach messages a day and the web app. Premium is US$34.99 a year or US$9.99 a month for unlimited scans and messages, the cheapest paid tier among the big trackers.

Compare that with a scanner: the scanner tells you a cereal is orange. PlateLens tells you how much fibre, sugar and sodium you got from the bowl you actually ate, and how it fits the day.

Which app is best for what?

When should you pick Yuka, ZOE or Cronometer instead?

Yuka: choose it if you mainly want to check additives on packaged food while shopping. That is what it is built for, and it does it quickly. Use it next to a diary, not in place of one.

ZOE: choose it if you like the idea of a single quality grade and its processed-food risk scale, and you want a framework for thinking about ultra-processed food. Treat the score as a nudge, not a target.

Cronometer: choose it if you want the deepest micronutrient panel. Its free plan has ads, manual entry and a barcode scanner, and Gold at US$59.99 a year adds photo logging and its Crono Coach assistant. It is a strong alternative to PlateLens for people who want to track every vitamin and mineral.

How should you use a score?

1. Use a score to shortlist, for example to pick between two similar products in the shop.
2. Ask why the score is low. If the reason is an additive you do not care about, or sugar you were planning to eat in a small portion, the number may not matter for you.
3. Log what you eat and look at real nutrient totals. That is where decisions about your own diet belong.
4. For anything tied to a health condition, talk to a doctor or registered dietitian. Nobody at The Review Bench is one, and no app score replaces that advice.

For more on the tracking side, see our calorie-tracking app roundup, our AI nutrition coach roundup and the full PlateLens review.

So, should you trust the results?

Food scores tell you something narrow and tell you it quickly. They do not know your portion, your day or your goals, so take them with a grain of salt. To decide well, look at the nutrients you actually eat. PlateLens is the best option for most people: real nutrients for every meal, a daily diary, and barcode and photo logging, with a free plan that never expires. Add Yuka for additive checks in the shop, or move to Cronometer if micronutrient depth is your priority.

Details about Yuka, ZOE, Cronometer and PlateLens come from each company’s own website and app-store pages. Our Ethics & Independence policy explains how we work.