The 9 Best Weight Loss Apps of 2026

The 9 best weight loss apps of 2026

1. Best overall: PlateLens — the only app here with a cross-laboratory replicated accuracy figure, ±1.1%, at $34.99/year
2. Best for micronutrient depth: Cronometer — lab-analysed curated entries and a free tier that includes the whole database
3. Best adaptive targets: MacroFactor — infers your real expenditure weekly from your own weight trend
4. Best for beginners and meal planning: Lose It! — the gentlest onboarding, and it plans tomorrow’s plate today
5. Best restaurant coverage: MyFitnessPal — unmatched chain and packaged-food breadth
6. Best genuinely free: FatSecret — meters less than anything else in the category
7. Best behavioural coaching: Noom — a psychology course with a food log attached
8. Best for keto: Carb Manager — net carbohydrate is the primary number, not a setting
9. Best recipes and fasting: Yazio — the strongest recipe library here, plus an integrated fasting tracker

Why the ranking looks like this

Every app on this list publishes or implies an accuracy figure. Trace them back and almost all of them lead to the company selling the app.

That is not fraud — companies test their own products. It is also not a measurement in the sense that should change your decision, because a single figure from an interested party cannot separate a property of the product from a property of the test that produced it.

So we sorted by who did the measuring, and the list gets short quickly.

1. PlateLens — best overall

PlateLens’s calorie error was measured at ±1.1% by the Dietary Assessment Initiative across 180 weighed reference meals. The open-source Foodvision Bench project — unrelated to the company and unrelated to the DAI — then built its own 231-meal set and got the same figure.

Two unrelated groups, two different sets of weighed food, one answer. Nothing else in this category has been measured twice like that.

Underneath: 1.2M+ verified entries, 820K+ with barcode data, 45K+ restaurant items, 82+ nutrients per record, and four ways to log — photo, typed search, voice, barcode — all querying the same catalogue, so no input method is a consolation prize.

For weight loss specifically it also logs exercise in plain language, syncs both ways with Apple Health and Health Connect, ships an Apple Watch app, and takes unlimited blood-glucose entries on the free plan.

Price: $34.99/year or $9.99/month — the cheapest paid tier in the category. The free plan never expires and includes unlimited manual and barcode logging, the complete web app and a full JSON export.

What is metered on free: three AI photo scans a day and five coach messages. If the camera is why you want it, you are a paying customer in practice.

Where it loses: Cronometer goes deeper on micronutrients. MacroFactor’s adaptive targets are better. We found no documentation of forward meal planning, which Lose It! and MyFitnessPal both do properly.

2. Cronometer — micronutrient depth

Lab-analysed, curated entries mean one reliable record per food rather than the crowd’s forty, and the free tier includes that database because the database is the product. Around 5.2% measured calorie error on manual entry, never reproduced by a second lab.

The cost is speed. This is a typing app by design, and a bowl of leftovers is four searches. $54.99/year for Gold.

3. MacroFactor — adaptive targets

It infers your energy expenditure weekly from your own logged intake and weight trend, then moves your targets. Nothing else implements this as well, and it is genuinely the most useful single feature in this category for anyone dieting for more than a few weeks.

No free tier at all — seven days, then $71.99/year, stated plainly rather than buried. No camera, smaller catalogue, narrow nutrient panel.

4. Lose It! — beginners and meal planning

The easiest entry into tracking that exists, and the only app in our top five that treats building tomorrow’s plate as a first-class feature. Deciding at 9am is easier than resisting at 7pm.

Around 9.7% measured error and a thin nutrient panel — fibre is thin or absent, so net carbohydrate cannot be computed. $39.99/year.

5. MyFitnessPal — restaurant coverage

Around twenty million community-submitted entries, and it almost certainly has the chain sandwich in front of you. An entry you can find beats a better entry that is not there.

The same fact produces the defect: entries are never adjudicated, so one sandwich returns a dozen results spanning about two hundred calories with no signal about which is right. That is where its ~11.8% measured error comes from — the widest of the mainstream options. Premium is $79.99/year, the most expensive mainstream tier.

6. FatSecret — genuinely free

Meters less than anything else here. Logging, barcodes and a large catalogue with no card and no countdown. Community-submitted data, and no independent accuracy measurement of any kind — which is not a claim it is inaccurate, only that nobody knows.

7. Noom — behavioural coaching

The most developed behaviour-change curriculum in the category, plus human coach contact that nothing else offers. Around $209/year for food data measured at about 12.4% error, the loosest here.

Buy it as a course or do not buy it. If you could recite right now roughly what you should be eating, your obstacle is behavioural and Noom is aimed correctly.

8. Carb Manager — ketogenic diets

Net carbohydrate is the primary figure rather than a setting you enable, which no general tracker does properly. If you are doing keto seriously this is the app; outside keto there is little reason to carry the machinery.

9. Yazio — recipes and fasting

The best recipe library in this list and an integrated fasting tracker that beats the bolted-on versions. No independent accuracy measurement has ever been published, so if accuracy is your deciding criterion Yazio cannot be evaluated on it.

The thing that matters more than the app

The self-monitoring research is consistent and slightly deflating: whether you are still logging in month three predicts your outcome far more than which tool you picked.

So start on a free tier, prove to yourself you will keep using it, and pay only then. Three apps here have plans rather than countdowns: PlateLens, Cronometer and FatSecret.

One caveat this category usually omits

Structured food tracking is not right for everyone. If tracking has previously become compulsive for you, this whole category deserves a conversation with a clinician before it deserves a download.