Best Weight Tracking Apps for iPhone in 2026, by Need

The best weight tracking app for iPhone is the one that matches how you actually weigh in, and most of them do the same basic job: you type in a number and get a chart. The differences that matter are smaller. Does it smooth out the daily noise? Can you add photos? Does it want an account? Will it work with the scale you already own? We give an overall pick, then a best option for each of those needs, because the right app for someone counting calories is the wrong one for someone who only wants a calm line on a graph.

First, a disclosure. This guide was written by the team that makes Periscope, one of the apps below, and we've named it our overall pick for a specific kind of user. We researched every app from its App Store listing and official website or privacy policy in October 2026. We haven't used each app day to day for weeks, so where a listing or site is silent we've written "Not stated" instead of guessing. Prices and ratings are US App Store figures and will change.

What makes a good weight tracking app?

A good tracker shows you the trend behind your weigh-ins, makes logging take seconds, and doesn't ask for more of your data than it needs. Everything else is a bonus that matters to some people and not others.

The trend is the big one. Your weight moves from one morning to the next because of water, salt, food in transit and hormones. In one man weighed daily for more than 9,500 days, the typical day-to-day change was about 0.5% of body weight, roughly a pound at 180 pounds, and bigger swings are common after a salty meal or a hard workout. A smoothed line, usually some kind of moving average, filters that out so you can see what's actually happening. Our explainer on trend weight covers how that works, and why your weight fluctuates daily covers the causes.

After that, it comes down to what you want:

• Progress photos, for the weeks when the scale stalls but your body is still changing.
• Predictions, if a projected goal date motivates you.
• Privacy and export, if you want your data on your phone and portable.
• Apple Watch, if you'd rather log from your wrist.
• Food tracking, if you're counting calories anyway.
• Smart scale support, usually through Apple Health.

How we compared

We checked each app against the same criteria using its App Store page and official site:

1. Price on the US App Store in October 2026, including what sits behind a paywall.
2. Account: whether you have to sign up before logging a weight.
3. Storage: on your device, in your own iCloud, or on the developer's servers.
4. Trend line or predictions.
5. Progress photos, widgets, Apple Health, Apple Watch and export.
6. Track record: rating, rating count and how recently the app was updated.

We left out apps that hadn't been updated in over a year or had very few ratings, except where they fill a gap no one else does.

What are the best weight tracking apps for iPhone?

Our overall pick is Periscope, for one reason: it's the only app in this guide that puts a smoothed trend line, weekly to yearly reports with BMI, progress photos with a before/after slider and Home Screen widgets in one place without charging for any of it. Weights and photos stay on your phone, and it syncs with Apple Health, so smart-scale readings come in on their own. It isn't the right fit for everyone, and the tables show where others lead.

Picks and price:

Features:

The smart-scale apps and Apple Health are covered in their own sections below.

The best apps, one by one

Periscope: best overall for a free, focused tracker

Best for: people who want weight, a smoothed trend and progress photos in one app, without paying for anything.

We make Periscope, so we're biased, and here is the specific case for ranking it first. MacroFactor is the only other app in this guide with a trend line, photo comparison and widgets together, and it costs $71.99 a year. Periscope has no subscription, ads or in-app purchases.

What stands out:

• Photos built into weigh-ins. Add up to two photos to any entry, then compare any two entries with a before/after slider or press Play to animate the change. An alignment tool lets you fit each photo to a body outline, so the two line up. (Our guide to progress photos covers lighting and timing.)
• A proper trend. The Reports tab has weekly, monthly and yearly cards, each with a lag-corrected moving average, rate of change per week, lowest weigh-in, BMI if you add your height, and an optional goal line. Cards can be shared as images. (For a one-off number, our BMI calculator works in the browser.)
• Widgets. Home Screen and Lock Screen widgets show the trend chart, goal progress, key stats such as your weekly rate, and a monthly summary.
• Apple Health sync. Turn it on and weigh-ins from Health, including a smart scale's, come in each time you open the app.
• The basics done well. Reminders (daily, every three days or weekly), Face ID lock, kg or lbs, multiple weigh-ins a day, eight languages, and support back to iOS 15.1.

What to know: you create an account with Sign in with Apple; weights, photos and notes stay on your phone and our server stores only account details. It's iPhone only, with no Apple Watch app, no export and no backup between devices. It doesn't predict goal dates. The Home chart shows raw weigh-ins; the smoothed line is in Reports and the widgets.

Where others beat it: Happy Scale on predictions, export and track record, Weight Diary and Weigh In on export and no-account setup, Monitor Your Weight and MacroFactor on Apple Watch.

Price as of October 2026: free.

Happy Scale: best for goal predictions

Best for: daily weighers who are motivated by a projected finish date.

Happy Scale is the app many people think of first for trend tracking. It smooths your weigh-ins with a moving average, predicts what you'll weigh in the future at your current pace, and lets you set milestone goals and event dates. It's been on the App Store since 2012, was updated in October 2026, and has a 4.89 average from 58,067 US ratings as of October 2026. Its privacy policy says health data stays on your device by default, and its site says it syncs between iPhone and iPad. You can export your log as a CSV file and protect it with a passcode.

What to know: progress photos aren't mentioned on its listing or site, it has no Apple Watch app, and some features sit behind Deluxe. For the full head-to-head, see Periscope vs Happy Scale; if you're already a user, our roundup of Happy Scale alternatives starts from what it doesn't do.

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

Weight Diary: best one-time purchase

Best for: a trend line and a time-to-target estimate, no account, no subscription.

If you'd rather pay once and never think about subscriptions or accounts, Weight Diary is the established choice: it has been on the App Store since 2011 and holds a 4.88 average from 2,625 ratings as of October 2026. Its graph runs a trend line through the daily noise and estimates a date for your target. Body fat, notes, Withings and Fitbit scales, Apple Health, Face ID and backup, import and export are all included, and data stays on your device or in your own iCloud backup.

What to know: no progress photos, no Apple Watch app, and it needs iOS 18. The free Weight Diary Lite is a separate app with fewer features, and its listing doesn't include Apple Health or scale sync.

Price as of October 2026: $7.99, once.

Weigh In: best free minimal app

Best for: logging weight and nothing else, privately, for free.

Weigh In is the most stripped-back app here, and its privacy story is the simplest: no account and a policy saying your entries are "not transmitted anywhere". Beyond a weight log you get a target, notes, reminders and graphs marking your start, target and average. It's also one of the few with CSV import and export, and it writes weigh-ins to Apple Health. Rating: 4.71 from 620.

What to know: no photos, no smoothed trend or predictions mentioned, no Apple Watch app.

Price as of October 2026: free, no in-app purchases.

Monitor Your Weight: best for Apple Watch and households

Best for: logging from your wrist, or tracking several people on one phone.

Monitor Your Weight packs in a lot: multiple profiles, body measurements, a target weight with a recommended time to reach it, BMI, body fat, average daily and weekly loss, a PIN lock, data export and web sharing with a doctor or coach. It connects Garmin, Withings, Aria and WiT scales and runs on iPhone, iPad, Mac and Apple Watch, back to iOS 13. Rating: 4.83 from 23,732.

What to know: cloud sync is a separate purchase that needs a login, and the listing doesn't describe progress photos.

Price as of October 2026: free; sync option $0.99.

Progress: best for body measurements

Best for: tracking waist, hips, arms and more alongside weight.

Now listed on the App Store as "Body Measurements Tracker App", Progress tracks 17 body measurements plus up to 10 custom ones, body fat and BMI, with front, side and back photos you can compare side by side. Apple Health sync works both ways on the free tier, and the listing says your data stays on your device and syncs through your own iCloud. Rating: 4.63 from 9,358.

What to know: photos are part of Pro, a trend line isn't mentioned, and it needs iOS 18.

Price as of October 2026: free; Pro $3.99 to $5.99 a month, $11.99 to $19.99 a year, or $29.99 lifetime (Apple lists several price points).

MacroFactor, Lose It! and MyFitnessPal: best if you log food

Best for: people who are counting calories anyway and want weight in the same place.

If you log food every day, a separate weight app may be one app too many. MacroFactor is the strongest on weight specifically: it smooths weigh-ins into a "Weight Trend" and uses it with your food log to estimate your energy expenditure and adjust your targets. It also has progress photos, widgets and an Apple Watch app. Rating: 4.84 from 23,128. It costs $11.99 a month, $47.99 for six months or $71.99 a year after a 7-day trial, and it needs an account.

Lose It! (4.77 from 780,704) and MyFitnessPal (4.71 from 2,376,053) are the big food-logging apps, both with weight charts, Apple Health and Apple Watch support. MyFitnessPal lets you attach a photo to a weigh-in. Neither describes a smoothed trend line. If you've stopped logging food and only open MyFitnessPal to weigh in, see our guide to MyFitnessPal alternatives for weight tracking only.

Prices as of October 2026: Lose It! Premium is typically $39.99 a year; MyFitnessPal Premium is $19.99 a month or $79.99 a year. Both have free tiers.

Calorie counters and coaching programs get a fuller comparison in our best weight loss apps for iPhone guide.

Withings and RENPHO: best if you own their scale

Best for: people with a Withings or RENPHO smart scale.

Your scale's own app is the obvious first stop. It pulls readings in automatically, shows body composition the scale measures, and can pass weight on to Apple Health.

The Withings app covers weight and body composition from Withings scales plus activity, sleep and blood pressure from its other devices, with multiple profiles, doctor sharing and an Apple Watch app. It needs a Withings account and stores data in Withings' cloud. Rating: 4.58 from 367,189. Free, with an optional Withings+ subscription at $9.99 a month or $99.99 a year.

RENPHO Health shows BMI, body fat, body water, muscle and other metrics from RENPHO scales, supports multiple profiles and writes to Apple Health. It describes itself as cloud-based. Rating: 4.71 from 8,990. Free, no in-app purchases.

Neither describes a smoothed trend line or progress photos, so many people pair the scale app with a dedicated tracker that syncs with Apple Health.

Apple Health on its own: best if you want nothing extra

Best for: people who'd rather not install anything.

The Health app is already on your iPhone. It stores weight from you, your apps and any HealthKit scale, and Apple says that data is encrypted on your device and, when synced to iCloud with two-factor authentication, end-to-end encrypted. It charts your weight over time. It's free and needs nothing beyond your Apple Account.

What to know: Apple doesn't describe progress photos, a goal weight, a smoothed trend line or a prediction for weight in Health. Its "Export All Health Data" option produces a zip with an XML file, not a simple spreadsheet. For setup, permissions and duplicate entries, see our guide to Apple Health weight tracking.

Price: free.

Which weight tracking app should you pick?

If you want a simple tracker and don't count calories, start with Periscope. It's free, its trend line and reports take the sting out of daily swings, and the photo slider shows change the scale misses. Apple Health sync brings in smart-scale readings, and your weights and photos stay on your phone. Skip it if you need export, an Apple Watch app, iPad sync or an app with no account. Otherwise, start from what you want the app to do:

• A free tracker with a trend line and progress photos: Periscope.
• A projected goal date and milestones: Happy Scale.
• No account and export, paying once: Weight Diary.
• No account and CSV export, free: Weigh In.
• An Apple Watch app without food logging: Monitor Your Weight.
• Tape measurements as well as weight: Progress.
• You count calories: MacroFactor if the trend matters most to you, Lose It! or MyFitnessPal for the biggest food databases.
• You own a Withings or RENPHO scale: its own app first.
• You don't want another app: Apple Health.

Combinations work well too. A scale saves to Apple Health, and a tracker like Periscope or Happy Scale syncs it in. That way you keep the scale's body-composition numbers and get a cleaner trend view on top.

More focused roundups: free weight tracker apps with no subscription, private weight tracker apps, progress photo apps, BMI tracker apps and the wider weight loss apps for iPhone, from calorie counters to coaching programs. If you're deciding between approaches rather than apps, see weight tracker vs calorie counter and Apple Health vs a weight tracker app.

Whichever you choose, how often you weigh matters more than which app you use. Our piece on how often to weigh yourself covers the research. Daily weighing and photos don't suit everyone; if they make you anxious or you have a history of disordered eating, skip them, and the National Eating Disorders Association is there if you need support.

Sources

1. Periscope on the App Store
2. Happy Scale on the App Store and privacy policy
3. Weight Diary on the App Store, Weight Diary Lite and privacy policy
4. Weigh In on the App Store and privacy policy
5. Monitor Your Weight on the App Store
6. Progress (Body Measurements Tracker App) on the App Store
7. MacroFactor on the App Store
8. Lose It! on the App Store
9. MyFitnessPal on the App Store and Progress Photos FAQs
10. Withings on the App Store
11. RENPHO Health on the App Store
12. Apple Health
13. Day-to-day weight variability in one man over 9,521 days (PubMed)