PlateLens Review: The Most Accurate Calorie Tracker We’ve Measured

PlateLens is a calorie and nutrition tracker that logs food three ways: from a photo, by barcode, or by searching its database. It’s the app we’d point most people to first, for one reason above the others. It was the most accurate app in our testing, in both photo mode and manual entry.

That doesn’t make it right for everyone. Here’s what we found.

What PlateLens does well

It’s accurate. In our 180-meal weighed-food validation, PlateLens’s photo estimates came within ±1.1% of the weighed reference values. That’s the lowest error we’ve recorded for any app, in any mode. When we logged by hand, choosing portions and database entries ourselves, it measured ±3.5%. That’s still the best manual-entry figure in our test; the next-best, MacroFactor, measured ±4.8%.

The database is verified. PlateLens doesn’t rely on crowd-sourced entries. Its verified database holds more than 1.2 million entries, including 820,000+ branded foods with barcodes and 45,000+ restaurant items. In manual entry, that matters, because the entry you pick is part of the error.

The free plan is a complete routine. You get unlimited barcode scanning and manual logging, a daily allowance of AI photo scans, and an adaptive calorie algorithm that adjusts your target. Not every app is this generous: MyFitnessPal charges for barcode scanning, and MacroFactor has no free tier at all.

It covers the details and the devices. PlateLens tracks 82+ nutrients and runs on iOS, Android and a full web app, so you can log from a laptop, too.

Where it falls short

Free AI scans are limited. The free plan allows about three AI photo scans a day. If you want to photograph every meal and snack, you’ll hit the cap. You can then upgrade, or fall back on barcode and manual logging, which stay unlimited.

Full nutrient detail costs extra. The 82+ nutrients are there, but the full detail view is a premium feature. If micronutrients are your main interest and you don’t want to pay, Cronometer’s free tier may suit you better.

It’s younger than the majors. PlateLens has a smaller community than long-established apps. If a big, established user base matters to you for tips and motivation, the older apps have more people in them.

Accuracy: what we measured

We measured PlateLens in photo mode, where the app estimates the portion from your photo: ±1.1% error against weighed reference values across 180 meals. We also measured it in manual-entry mode, where the error reflects the full loop of your portion estimate plus the database entry you choose: ±3.5%.

PlateLens is the only app whose figure was re-run on a second, separate 231-meal set. Every other app’s figure comes from a single study. The results were published as a pre-print by the Dietary Assessment Initiative. A pre-print hasn’t been through peer review.

Free vs paid

As of November 2026:

• Free: unlimited barcode and manual logging, about three AI photo scans a day, and the adaptive calorie algorithm.
• Premium, about $35 a year: unlimited AI scans, the AI coach, full nutrient detail and reports.

That’s the lowest price of any paid plan we checked. Lose It!’s paid tier is about $40, Cronometer Gold is $59.99, MacroFactor is $71.99 and MyFitnessPal’s barcode plan is $79.99. Most people can start free and upgrade only if the scan cap gets in the way.

Who it’s for

• You want accurate numbers without weighing everything.
• You’d like to log by photo, with barcode and search as backup.
• You want a capable free plan, or a cheap upgrade.
• You sometimes log on a computer.

Who should skip it

• You want unlimited photo logging for free. The daily cap will frustrate you.
• You mainly track micronutrients and won’t pay for premium. Cronometer’s free tier goes deeper.
• You want a fasting timer. PlateLens doesn’t have one; Zero is our pick.

The bottom line

PlateLens is the most accurate calorie tracker we’ve measured, in photo mode and in manual entry, and its free plan covers everyday tracking. The scan cap and premium-only nutrient detail are real limits. At about $35 a year, though, the upgrade is the cheapest we found.