# One Rep Max vs 531 Strength

The clearest difference is review sentiment: 531 Strength at 94% against One Rep Max's 57%. 531 Strength also leads on rating (4.9 vs 4.4) and ratings volume (12K vs 185). One Rep Max's advantage is update cadence (every 6 days vs every 2 months) and iOS requirement (15.0 vs 18.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. One Rep Max sells 2 in-app purchases, starting at $2.99 per month and 531 Strength sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

531 Strength holds the better App Store score, 4.9 against 4.4. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 185, so its average is the more settled of the two. Written reviews point the same way: 57% of One Rep Max's written reviews are positive against 94% of 531 Strength's.

One Rep Max ships an update every 6 days, 531 Strength every 2 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | One Rep Max | 531 Strength |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (185 ratings)](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710/reviews) | **[4.9 (12K ratings)](https://appshunter.io/ios/app/531-strength/id1062989244/reviews)** |
| Number of ratings | 185 | **12K** |
| Positive reviews | 57.1% of reviews | **94.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | **Every 6 days** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 52 MB | 26 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Charles Vanderhoff](https://appshunter.io/developer/950621709) | [Henrik Jachobsen](https://appshunter.io/developer/497731838) |

## What reviewers say

### One Rep Max

[App page](https://appshunter.io/ios/app/one-rep-max-1rm-calculator/id950621710)

Safely estimate your maximum lift potential for various strength exercises using scientific formulas. Track your progress visually, set goals, and fine-tune estimates with perceived exertion. Ideal for powerlifters, CrossFit athletes, and strength enthusiasts.

**Highlights:** Precise 1RM calculations with 7 scientific formulas, RPE integration for fine-tuned estimates, Custom exercise tracking for any lift, Visual progress graphs, Percentage charts for training, Goal setting and progress monitoring

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1RM Pro Monthly | $2.99 | per month |
| 1RM Pro Annual | $19.99 | per year |

**What reviewers like**

- 👍 Easy to use interface
- 📊 Tracks progress with charts
- ➕ Plate calculator bonus feature
- 📈 Supports multiple 1RM formulas
- 💪 Helpful for tracking RMs

**What reviewers complain about**

- 💰 Subscription required for features
- 💸 Features moved behind paywall
- 😩 Useless without subscription
- 🚫 Basic features now paid
- 💸 High subscription cost

**Reported bugs**

- Features behind paywall
- Forced ads
- Deleted lifting history
- Lost all logs with update
- Weight limit restriction

**Requested features**

- Allow editing of logs (date/time)
- Manual entry for weight preferred over slider
- Include different 1RM formulas (Epley, Brzycki)
- Ability to create custom graphs
- Fix weight limit restriction


### 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


## Frequently asked questions

### Is One Rep Max free?

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

### Is 531 Strength free?

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

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

531 Strength is rated higher. One Rep Max averages 4.4 out of 5 from 185 ratings, while 531 Strength averages 4.9 from 12K ratings.

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

Both One Rep Max and 531 Strength show ads.

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

One Rep Max ships an update every 6 days, and 531 Strength every 2 months. Most recently, One Rep Max was updated on November 3, 2026 and 531 Strength on November 5, 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.*