Obra - One Rep Max
One rep max calculator
Archived App (Last seen on 12 Apr 2026)
This is an archived listing of the app previously available on the App Store.Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.
About
Calculate your one-rep max by entering the weight lifted and reps performed. The app then predicts your one-rep max and shows you the reps you can achieve at various weights.
What's New in Obra
1.0
June 11, 2022
Developer apps
FAQ
How does Obra calculate your one-rep max?
Obra calculates your one-rep max by taking the weight you lifted and the number of repetitions you performed. It then uses this data to estimate your maximum single lift.
What kind of workout predictions does Obra offer?
Beyond the one-rep max, Obra predicts the different repetitions you should be able to perform at various weights, helping you plan your training.
Is Obra available on Android devices?
Currently, Obra is supported on iPhone and iPod devices. There is no information available regarding Android support at this time.
How often is Obra updated?
Obra was last updated on June 11, 2022, with version 1.0. Future updates will depend on developer plans.
What is the age rating for Obra?
Obra has an age rating of 4+, making it suitable for a wide range of users interested in fitness tracking.
Does Obra have ads?
No, Obra does not contain advertisements. It is a completely ad-free application.
What is the user feedback on Obra?
Obra has received a perfect rating of 5.0 stars from one user review, indicating positive initial reception.
Is Obra free to use?
Yes, Obra is completely free to download and use. There are no costs associated with its features or functionality.
