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About By Then

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.

What’s new

Version 2026.3 · Updated August 1, 2026

Minor bug fixes and updates. Some stability improvements to tap areas.

App privacy

The developer, Michael Lysons, reported these privacy practices to Apple.

Data Not Collected

The developer does not collect any data from this app.

Alternatives to By Then

Looking for apps like By Then? Here are 6 similar apps on the App Store. The highest rated is Pediapal: Child Health Monitor (5.0/5), and all 6 are free to download.

By Then vs. alternatives
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By Then – Free August 1, 2026
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