# Obra - One Rep Max — One rep max calculator

> Calculates one-rep max and rep predictions based on lifted weight and reps. (iPhone/iPad app by Jose Aguilar.)

- Source: https://appshunter.io/ios/app/obra-one-rep-max/id1627351639 (this page in markdown: same URL + `.md`)
- Developer: [Jose Aguilar](https://appshunter.io/developer/1161822659)
- Category: Sports, Utilities
- Price: Free
- Rating: 5.00/5 from 1 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 4 MB
- Languages: English
- Released: 2022-06-11
- Data updated: 2026-06-13
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/obra-one-rep-max/id1627351639/reviews.md

## What is Obra?

There are no simple one-rep max calculators out there.

So here it is!
Enter the weight you lifted and the reps you performed and the app will show you your one-rep max and the different reps you should be able to perform at different weights.

## Key features

- One-rep max calculation
- Repetition prediction
- Weight and rep input
- Workout performance analysis


## Frequently asked questions about Obra

### 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.

## Version history (last 1 release)

### 1.0 — 2022-06-11

No release notes.

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## More apps by Jose Aguilar

- [My Gym Pass](https://appshunter.io/ios/app/my-gym-pass/id1161822660)
- [Obra Pass](https://appshunter.io/ios/app/obra-pass/id1163968471)

All apps by Jose Aguilar: https://appshunter.io/developer/1161822659

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-13.*