# 531 Strength vs One Rep Max

531 Strength and One Rep Max both sit at 4.9 stars, but that hides the real split: 94% of 531 Strength's written reviews are positive against 33% of One Rep Max's. 531 Strength also leads on ratings volume (12K vs 1). One Rep Max's advantage is ads (none vs shown) and update cadence (every 10 days vs every 2 months). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. 531 Strength sells 4 one-off in-app purchases and One Rep Max sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for 531 Strength against 5.0 for One Rep Max. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 1, so its average is the more settled of the two. Written reviews are what separate them: 94% of 531 Strength's written reviews are positive against 33% of One Rep Max's.

531 Strength ships an update every 2 months, One Rep Max every 10 days. The most recent releases landed on November 12, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | 531 Strength | One Rep Max |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (12K ratings)](https://appshunter.io/ios/app/531-strength/id1062989244/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id1367332610/reviews)** |
| Number of ratings | **12K** | 1 |
| Positive reviews | **94.0% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 26 MB | 13 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Henrik Jachobsen](https://appshunter.io/developer/497731838) | [App Ktchn Ltd](https://appshunter.io/developer/870718126) |

## What reviewers say

### 531 Strength

[App page](https://appshunter.io/ios/app/531-strength/id1062989244)

This app simplifies tracking your progress on the 5/3/1 strength training program. It calculates and displays weights, reps, and sets based on your one-rep max, allowing you to easily plan and execute your workouts. Rounding options help match available gym plates.

**Highlights:** Calculate 5/3/1 weights, Track 1RM for exercises, View cycle step weights, Round weights to available plates, Full overview of weights, reps, sets

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Additional exercises | $1.99 | one-time |
| Adjustable set | $1.99 | one-time |
| Plate calculator | $1.99 | one-time |
| Progress log | $6.99 | one-time |

**What reviewers like**

- 🚀 Simple and efficient
- 👍 Intuitive interface
- 💪 Helps with strength gains
- 🔧 Customizable features
- ⏱️ Convenient timer

**What reviewers complain about**

- 🔢 Inaccurate percentage calculations
- 🗓️ Lack of ability to plan future workouts
- 📋 Limited exercise tracking
- 💰 Paid features not worth the cost

**Reported bugs**

- Rest timer stops when app is backgrounded
- Plate calculator not flexible enough

**Requested features**

- Ability to adjust training max separately from 1RM
- Option to track rep PRs and estimated 1RM
- Accessory exercise tracking and planning
- Sync progress across devices


### One Rep Max

[App page](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id1367332610)

Easily calculate your One Rep Max (1RM) for various strength exercises. Track your progress over time with saved calculations, view personalized percentages, and visualize your strength gains through charts. Supports multiple exercise types and custom units.

**Highlights:** Calculate One Rep Max, Save and track progress, View 1RM percentages, Log multiple exercise types, Create custom exercises, View strength gain charts, Imperial or Metric units

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1RM Pro Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is 531 Strength free?

531 Strength is free to download, with in-app purchases available.

### Is One Rep Max free?

One Rep Max is free to download, with in-app purchases available.

### Which has better reviews, 531 Strength or One Rep Max?

One Rep Max is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while One Rep Max averages 5.0 from 1 ratings.

### Do 531 Strength or One Rep Max have ads?

531 Strength shows ads; One Rep Max does not.

### Which is updated more often, 531 Strength or One Rep Max?

531 Strength ships an update every 2 months, and One Rep Max every 10 days. Most recently, 531 Strength was updated on November 12, 2026 and One Rep Max on November 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*