CHALLENGE
Halloween Dress-Up
Weigh in on 3 days before Nov 1 and your companion earns a pumpkin. Make it 6 days for a witch's hat.
Scalin: Weight Tracker
Daily trends & a little buddy
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
Meet your little weigh-in companion. Follow your trend, celebrate progress and, if you take a weekly GLP-1, see what your weight does between shots.
A little buddy for the ups and downs.
Scalin is a weight tracker with a small companion and a big personality. Log your weigh-ins, follow a smoother trend, and get a little perspective when today's number surprises you.
YOUR TREND, WITH CONTEXT
See how your weight is changing over time. Scalin smooths your weigh-ins into a trend estimate, called "true weight" in the app, so you can look beyond a single reading. Track your weekly pace, set a goal, and explore an estimated range for a future date as your history builds.
A COMPANION WITH CHARACTER
Your little buddy follows you around the app and comments on your progress, pauses, and daily ups and downs. Choose Supportive, Snarky, or Merciless to find your kind of company. Change the tone whenever you like, or mute a line that doesn't land.
MAKE ROOM FOR THE WHOLE JOURNEY
Track weight loss, gain, or maintenance in kg or lb. Review your history, add a missed weigh-in, and edit an entry when you need to. Record notes and possible reasons for a change, then look back at the bigger picture. Celebrate milestones along the way.
ON A WEEKLY GLP-1?
Turn on shot tracking during setup or in Settings. Today marks your shot day, your chart marks each shot, and after a few weeks Scalin shows which days after a shot your weigh-ins run lowest and highest against your trend. Log the dose, the injection site (Scalin suggests the next one) and how the days after felt. Add an optional shot-day reminder. Scalin keeps the record; decisions about your medication stay with your clinician.
FITS INTO YOUR MORNING
- Log on iPhone, or use the Digital Crown on Apple Watch.
- Connect Apple Health to import weight history and save new weigh-ins, with your permission.
- Bring in readings from a smart scale through Apple Health if its app saves weight there.
- See your trend in widgets, Apple Watch complications and, if you like, the Dynamic Island.
- Ask Siri about your trend, or ask Scalin directly, answered on your iPhone.
- Set an optional weigh-in reminder.
KEEP YOUR NUMBER PERSONAL
Widgets keep your absolute weight hidden by default. Add an app lock with Face ID, Touch ID, or your device passcode, and export your history as CSV whenever you need it. No Scalin account is required.
Scalin focuses on weight tracking. It doesn't count calories, calculate BMI, prescribe a diet, or advise on medication. Trends and forecasts are estimates based on your entries, not medical measurements or guarantees of future results.
SUBSCRIPTION
A subscription is required to use Scalin after setup. Available plans, prices, and any free trial you are eligible for are shown before purchase.
Payment is charged to your Apple Account when you confirm a purchase, or at the end of an applicable free trial. Subscriptions renew automatically unless canceled at least 24 hours before the current period ends. Manage or cancel your subscription in your Apple Account settings.
Terms of Use: https://scalinapp.com/terms
Privacy Policy: https://scalinapp.com/privacy
Events
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Halloween, a GLP-1 companion, a weekly read-back, and Scalin in a few new places.
- Halloween dress-up: weigh in on 3 days between Oct 23 and Nov 1 to earn a little pumpkin, or on 6 for a witch's hat.
- On a weekly GLP-1? Mark your shot day, log each shot (dose, site and how the days after felt) and see what your weight does between shots. Turn it on in Settings › GLP-1 shots.
- Your week: in the first days of each week, Today reads back the one before — what your trend did, how far the scale wandered around it, and your loudest morning.
- Share your line: turn your trend into a short vertical video for Stories, Reels and TikTok. Only the change is in it, never your weight.
- Ask Scalin: ask about your weigh-ins — "When was I last below 80?" — answered on your iPhone with Apple Intelligence.
- Siri: "How's my trend in Scalin", "How was my week in Scalin" or "Ask Scalin". Spoken answers keep your weight private unless you show it in widgets.
- Dynamic Island: let Scalin keep you company there. Turn it on in Settings › Widgets & Watch.
- Scalin now speaks German, Spanish and French.
The developer, Gleb Matsko, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Health & Fitness
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Gleb Matsko
- Size
- 29.9 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later. - Apple Watch
Requires watchOS 10.0 or later.
- iPhone
- Languages
English and 3 more
- English, French, German, Spanish
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Scalin Membership: Yearly $44.99
- Scalin Membership: Weekly $4.99
- Copyright
- © 2026 Gleb Matsko