Best Weight Loss Apps for iPhone in 2026: Trackers vs Programs

The best weight loss apps for iPhone aren't really competitors: a calorie counter with millions of foods, a psychology-based program with coaches, a dosing log for GLP-1 medication and a simple weight chart all show up for the same search. They answer different questions, and choosing well starts with knowing which question is yours.

A disclosure before we start. This guide comes from the team that makes Periscope, a free weight tracker that appears below. We researched each app from its App Store listing and official website in October 2026. We haven't followed every program for weeks, so where something isn't stated by the developer we say "Not stated". We've also left out the results figures some apps publish about their own users, because we can't check them. Prices and ratings are from the US App Store and change often. If you only want a tracker, our comparison of the best weight tracking apps for iPhone goes deeper on that category.

What kind of weight loss app do you need?

There are three broad types, and most people need one or two of them, not all three.

Weight trackers measure the outcome. You log your weight (by hand or from a smart scale) and the app shows the trend. Some add progress photos, predictions or reports. They don't tell you what to eat.

Calorie and macro counters track the input. You log food, often by barcode or photo, and the app keeps you within a daily budget. Most also log weight, though usually as a simple chart.

Coaching programs guide behavior. They wrap food tracking in a plan, lessons, community, and sometimes human coaches or clinical care. They cost the most. If you're torn between the first two, our weight tracker vs calorie counter guide covers what the research says about each.

The National Institute of Diabetes and Digestive and Kidney Diseases puts it bluntly: "A weight-loss program is more than a book or app." It says a good program includes a reduced-calorie eating plan, a plan for activity, ongoing support with self-monitoring and feedback, and a plan for keeping the weight off. That's a useful lens. A calorie counter covers the eating plan. A coaching app tries to cover all of it. A weight tracker covers the self-monitoring part, which matters: a 2015 review of 17 studies found regular self-weighing was associated with more weight loss.

How we compared

For each app we looked at:

1. What it's for: tracking weight, logging food, coaching, or a mix.
2. Price on the US App Store in October 2026. Many of these apps list a dozen in-app purchase prices, including intro and legacy offers, so we quote ranges or the developer's own stated price.
3. Account: whether you need one, and where your data is stored.
4. Weight features: a smoothed trend line, progress photos, Apple Health.
5. Apple Watch support, from each App Store compatibility list.
6. Track record: rating and number of ratings.

The best weight loss apps at a glance

Type, price and track record:

What each one does:

Which apps track the outcome?

Periscope: best free way to track your results

Best for: anyone who wants to see their weight trend and their changing shape, whichever plan they're following, or with no plan at all.

We make Periscope, so take our view as informed but not neutral. It answers one question, "is this working?", and leaves the how to you. Weigh in (several times a day if you like) and the Reports tab turns those numbers into weekly, monthly and yearly cards: a smoothed trend line that evens out day-to-day water-weight swings, your weekly rate of change, your lowest weigh-in, an optional goal line and, if you add your height, BMI (our BMI calculator explains the ranges). Photos are where it differs from most program apps: attach up to two to a weigh-in, then slide between any two dates or play them as an animation. Widgets on the Home Screen and Lock Screen keep the trend in view between check-ins, and weights and photos are stored on your phone.

It pairs well with everything else on this page. It syncs with Apple Health, so if your program app or smart scale saves weight to Health, it shows up in Periscope and you don't need to log twice.

What to know: Periscope doesn't log food, set calorie targets, plan meals or coach you. The apps below do, and Periscope works alongside them. It uses Sign in with Apple and is iPhone only, with no export, Apple Watch app or syncing between devices.

Price as of October 2026: free, with no ads, subscription or in-app purchases.

Happy Scale: best tracker for goal predictions

Best for: people motivated by knowing roughly when they'll reach their goal.

Happy Scale also focuses on the outcome, and goes further than Periscope on forecasting: it projects your future weight at your current pace and lets you set milestones and event dates. It has been around since 2012, and asks for no account. Progress photos aren't mentioned. The two are compared in detail in Periscope vs Happy Scale.

Price as of October 2026: free; Deluxe $1.99 a month, $11.99 a year or $39.99 lifetime.

Which apps track what you eat?

MyFitnessPal: best for the biggest food database

Best for: logging almost anything you eat, including restaurant and packaged food.

MyFitnessPal's listing cites more than 20.5 million foods, along with macro tracking, an AI coach, a GLP-1 log, water, fasting and workouts. Weight lives in a Progress tab with a chart, and you can attach a photo to a weigh-in. It has an Apple Watch app and connects to Apple Health.

What to know: it's account-based, and a smoothed trend line isn't described.

Price as of October 2026: free; Premium $19.99 a month or $79.99 a year (other price points are listed).

Lose It!: best for straightforward calorie budgeting

Best for: a calorie budget and weight-loss schedule without much else in the way.

Lose It! sets a calorie budget tied to a schedule for reaching your goal weight, and its listing describes a database of 56 million-plus items and recipes. It supports GLP-1 tracking and intermittent fasting, and it has an Apple Watch app. Its Premium tier adds photo and voice meal logging, the barcode scanner, body measurements and syncs with devices such as Fitbit, Garmin, Withings scales and HealthKit.

What to know: a lot of the convenience sits in Premium. Progress photos and a smoothed trend aren't stated.

Price as of October 2026: free; Premium is typically $39.99 a year, with other price points listed.

MacroFactor: best if you want the app to adjust your targets

Best for: people who will log food and weigh in consistently, and want the math done for them.

MacroFactor turns your daily weigh-ins into a "Weight Trend", then uses that trend and your food log to estimate how much energy you actually burn and adjust your calorie and macro targets. It's the most weight-literate of the calorie apps: it also has progress photos with side-by-side comparison, 21 body metrics, widgets and an Apple Watch app showing scale and trend weight.

What to know: there's no free tier after the 7-day trial, and you get the most out of it only if you log food. It needs an account.

Price as of October 2026: $11.99 a month, $47.99 for six months or $71.99 a year.

Which apps coach you through a program?

WeightWatchers: best structured program with human support

Best for: people who want a well-known system, live sessions and access to professionals.

WeightWatchers is built around its Points program, with ZeroPoint foods, a barcode scanner and macro tracking. The listing also describes live virtual sessions with weight loss coaches, 1:1 support from registered dietitians, a members' community, a GLP-1 program with dose tracking, and a clinical service (Med+) for eligible members. There's an AI body scanner for 3D progress and syncing with Apple Health and Fitbit. It has an Apple Watch app.

What to know: it's a membership, and some services (like dietitian support or medication) depend on eligibility, insurance or extra cost.

Price as of October 2026: monthly plans listed at $19.99 to $24.99, and a 6-month digital plan at $108.99.

Noom: best for a psychology-led approach

Best for: people who want to work on the habits behind eating as well as the numbers.

Noom combines AI food logging with calorie and macro tracking, daily lessons on psychology and behavior change, step tracking with rewards, meal plans, Noom Move workout classes, community groups and optional 1:1 coaching. A separate Noom Med tier offers access to GLP-1 medication if you're eligible. It syncs with Apple Health, Fitbit, Garmin and Withings.

What to know: there's no Apple Watch app in its compatibility list, and the full value depends on doing the daily lessons.

Price as of October 2026: the listing says plans start at $17 a month, based on a $209 annual plan; Noom Med starts at $69 a month, not including medication. In-app purchases are listed from $44.99 to $199.99.

Simple: best AI coach without calorie counting

Best for: people who want light-touch daily guidance and dislike counting calories.

Simple centers on an AI coach that gives personalized advice, photo-based food feedback ("no calorie math"), beginner-friendly workouts and a daily Success Score, with a cartoon character that reacts to what you log. You can log food, water, activity and weight. It has a Home Screen widget, Apple Health integration and an Apple Watch app.

What to know: it's subscription-based. Weight charts and trend smoothing aren't described in detail.

Price as of October 2026: Simple Pro and Premium subscriptions are listed between $14.99 and $59.99; billing periods aren't shown on the listing.

Which weight loss app should you pick?

If you already know roughly what you're changing (eating a bit less, moving a bit more) and want a simple way to see whether it's working, we'd start with Periscope. It's free, it smooths daily swings into a trend with weekly to yearly reports and BMI, and its photos show change when the scale stalls. It syncs with Apple Health, so it works alongside any program app that saves your weight there. Otherwise, ask what you actually need help with:

• "I know what to do; I just want to see if it's working." A weight tracker. Periscope if you want photos and a trend for free; Happy Scale if you want predictions.
• "I need to see what I'm eating." MyFitnessPal or Lose It!.
• "I'll log food carefully and want my targets adjusted." MacroFactor.
• "I want structure, people and a plan." WeightWatchers or Noom.
• "I want daily nudges without counting." Simple.
• "I'm on a GLP-1 medication." WeightWatchers, Noom, MyFitnessPal and Lose It! all mention GLP-1 support. Talk to your prescriber about what to track.

Most people end up with two apps: one for the input (food or a program) and one for the outcome. If you go that way, set your program app to save weight to Apple Health and let your tracker sync it in, so you only weigh in once.

Two cautions. Whatever app you use, aim for a steady pace; our guide to a realistic weight loss rate per week covers what the CDC and NHS suggest. And if logging food, weighing or photos makes you anxious, or you have a history of disordered eating, these tools may not be right for you. The National Eating Disorders Association offers support, and if you'd rather not count anything, see how to know you're in a calorie deficit without counting.

Sources

1. NIDDK. Choosing a Safe & Successful Weight-loss Program
2. Zheng Y, et al. Self-weighing in weight management: a systematic literature review. Obesity. 2015.
3. Periscope on the App Store
4. Happy Scale on the App Store
5. MyFitnessPal on the App Store and Progress Photos FAQs
6. Lose It! on the App Store
7. MacroFactor on the App Store
8. WeightWatchers Program on the App Store
9. Noom on the App Store
10. Simple: AI Weight Loss Coach on the App Store