By Then
Weight gain/loss companion
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
A weight gain/loss calculator for people who have weight goals they want to achieve.
If you need to gain weight or lose weight, By Then will tell you what you need to do to achieve that goal. Simply enter your current weight and target weight, and then either a weekly weight change you can commit to or a target date, and By Then will calculate the rest.
The widgets allow you to perform the calculations right on your Home Screen for added convenience.
A one-off purchase unlocks the weekly weight-change projections view and a number of themes to personalise the app.
Simple, focused, to the point; you'll know where you need to be, By Then.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Minor bug fixes and updates.
Some stability improvements to tap areas.
The developer, Michael Lysons, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Michael Lysons
- Size
- 6.3 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Unlock all features $5.00
- Copyright
- © (c) 2026 - Michael Lysons