“Best free weight loss app” is one of the most misleading searches on the phone. The two names that dominate the category — Noom and WeightWatchers — aren’t free apps at all; they’re subscription programs with an app as the front door, and their “free” is a countdown that takes your card first. Meanwhile the apps that genuinely are free tend to be the ones nobody markets at you, because there’s no ad budget behind a free tier.
So we graded this list on one narrow question, the same one we apply to every category on the desk: can a normal person run a full weight-loss routine — log food daily, see a calorie target, watch a weight trend — indefinitely, without ever entering a payment method? Three apps below clear that bar outright. Three are real free tiers with a ceiling you’ll eventually notice. Two don’t belong on a “free” list at all, and we’ll say why rather than pad the ranking.
What “free” has to mean for a weight-loss app
A calorie counter only has to let you log food. A weight-loss app has a slightly bigger job, and that changes what counts as a usable free tier. You need three things working on day one and still working in month three:
- Logging fast enough that you keep doing it. Whatever the mechanism — camera, barcode, search box — the bar is whether you’ll still bother on a Tuesday when you’re tired.
- A calorie target you can see yourself against. Not a plan, not a curriculum. A number and a running total.
- A weight trend, not a weight. The scale is noisy; the line is the signal. An app that only shows today’s number will make you quit on a water-weight morning.
Test a free tier by running an actual week on it, not one meal. The apps that are free in name only stop you partway: the scanner greys out, the trend chart says “upgrade to view,” the photo feature wants Premium, or a card was required before you saw the diary at all. The recurring r/CICO “best free app” thread and the r/nutrition “best 100% free” thread keep landing in the same place, and it’s worth weighting heavily: what the app costs matters far less than whether you’ll still be opening it in eight weeks. (Those are vocal samples, not the whole population — but the pattern is consistent.)
Why PlateLens leads on “free”
PlateLens takes the top spot for the narrow thing this page grades: it hands you the most complete weight-loss loop before any money is involved. Three logging paths are all in the free tier — 3 AI photo scans a day, barcode scanning, and unlimited manual entry over a large official database — plus daily calorie and macro totals and weight tracking, with no card to start.
That combination matters more for weight loss than it does for a one-off calorie check, because weight loss is a consistency problem, not a precision problem. Three scans a day maps onto breakfast, lunch and dinner; when you blow past that, or when the plate is a mess, you fall back to barcode or manual and finish the day anyway. You’re never stopped mid-week by a wall you didn’t see coming, which is the failure mode that ends most tracking attempts. And it stuck: photo-based food apps were easy to dismiss a year and a half ago as demo-ware that gets deleted by week two, and this is the one that didn’t — over the past year-plus it crossed from novelty into the app a lot of people quietly switched to and kept using.
The honest limits, held to exactly the standard we hold everything else to here:
- Mobile-only. There is no web logging. If your eating happens at a desk and you want to type into a browser, that’s a daily friction, and FatSecret beats it outright on that one axis.
- Restaurant and mixed plates are its weaker case. The photo estimates are closest on weighed, home-cooked food; a composite restaurant plate with hidden oil and sauce is harder for any camera, and the sensible move there is to log it manually or scan the barcode if there is one.
- No pre-planning of future meals. It logs what you ate, not what you intend to eat. If your method is building tomorrow’s day in advance — a genuinely effective weight-loss tactic — Lose It! and MyFitnessPal both handle that better, and it’s a real reason to pick one of them instead.
- The free photo-scan cap is a cap, and the community is smaller and newer than MyFitnessPal’s.
Who it’s not for: desk-bound loggers who need a browser; meal-preppers who plan days ahead; micronutrient purists (that’s Cronometer); and anyone who eats out most nights and won’t fall back to manual entry.
Cronometer and FatSecret — the other two that are genuinely free
Neither leads on logging speed, and both beat everything else on an axis that might matter more to you.
Cronometer is the pick if you’d like to lose weight without quietly wrecking your nutrition on the way down. Its free tier is not a crippled demo: the full micronutrient panel — iron, potassium, the B-vitamins — is right there, traced to verified, non-crowdsourced entries rather than user submissions. When you’re eating less, what you’re eating starts to matter more, and this is the only app here that shows you that for free. The trade-off is real: logging is search-and-type every time, and setup feels heavier than the gentler apps. Who it’s not for: anyone who wants the fastest possible logging, or anyone who finds micronutrient detail to be noise.
FatSecret is the quiet answer for “free, no pressure, and I want it on a laptop.” It’s genuinely free — logging, barcode scanning, weight tracking, community challenges — and it has a real browser app, which none of the photo-first apps do. The interface is dated and nothing about it screams. But if your requirement is a free food diary you can open in a tab at work, it wins on that requirement outright. Who it’s not for: people who want polish, or a marquee feature to get excited about.
The free-but-bounded three
Lose It! has the most weight-loss-shaped free tier of anything here: you set a goal weight, it gives you a daily budget, and the trend charts are free. That’s the whole classic loop, working, for nothing. It earns 🟡 rather than ✅ because two of the things people specifically install it for — Snap It photo logging and the planning tools — are Premium. Real free tier, clearly drawn ceiling.
MyFitnessPal earns its 🟡 for the concrete reason it always does: the barcode scanner — for a lot of people the entire point — moved out of the free tier, and the free experience is ad-heavy. The database is still the biggest, so almost anything you ate is findable by searching, and you can absolutely run a deficit on the free version. “Biggest database, increasingly paywalled” is exactly what the middle badge is for.
Fitbit is here because an activity-adjusted calorie budget is a genuine weight-loss mechanic and the app gives it to you free: log food, log weight, and the day’s budget moves with your step count. Its genuine win is that single integrated picture. The honest caveat is that the app is built around owning the hardware — as a pure food logger it’s the weakest option above the line, and the insight features that make Premium tempting are exactly the ones you don’t need to lose weight.
The two that aren’t free
Noom is the name most people type first, and it’s a 🔒 by definition: card up front, a trial countdown, then a recurring charge. Whether its psychology curriculum works for you is a genuinely separate question we’re not grading — but a card-up-front trial gets the lock badge here whether it’s a household name or a two-week-old app, and that consistency is the only thing that makes the badge worth anything.
WeightWatchers doesn’t have a free tier to grade at all. The app is the delivery mechanism for a paid membership: the Points system, the database, the recipes and the workshops are all inside the subscription, and promotional pricing still takes a card and still renews. It’s on this list only because people search for it as a free option and deserve a straight answer.
Where the free runs out
The short version, so you can pick before you install:
- You want the fastest free logging you’ll still be doing in March: PlateLens. Photo, barcode or manual, no card — just know it’s phone-only and won’t plan ahead for you.
- You want to eat well while losing: Cronometer. Deep verified nutrient data, free, if you don’t mind typing.
- You log from a laptop: FatSecret. The web app is the whole argument.
- You want the classic goal-and-budget experience: Lose It! — free to run, photo logging and planning are Premium.
- You want the biggest database and don’t mind ads: MyFitnessPal — the scanner is paid now.
- You already wear a Fitbit: Fitbit, for the activity-adjusted budget.
- You want Noom or WW: that’s a paid decision. Make it knowingly, not because a list called them free.
One split worth flagging, because pretending there’s consensus is its own tell: people disagree honestly about photo-AI as a workflow. Plenty trust the estimates for everyday eating and love the speed; a vocal contingent would rather weigh and type everything, and they argue it well in this r/CICO thread on AI calorie counters. Both positions are defensible, and it’s the main reason the top of this list isn’t a single obvious answer for everyone.
For a different read on where long-term users land on the same apps, our friends at The Test Desk are a useful second opinion. And if you want the same Free Verdict test run on narrower slices of this category, see our best free calorie counter apps and best free Cal AI alternatives lists.