# 531 Strength vs 1

531 Strength and 1 both sit at 4.9 stars, but that hides the real split: 94% of 531 Strength's written reviews are positive against 39% of 1's. 531 Strength also leads on price (Free vs $1.99) and ratings volume (12K vs 1.1K). 1's advantage is in-app purchases (none vs 4) and ads (none vs shown). On rating, update cadence and device support there is nothing between them.

531 Strength is free to download; 1 costs $1.99 up front. 531 Strength sells 4 one-off in-app purchases. 1 asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for 531 Strength against 4.8 for 1. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 1.1K, 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 39% of 1's.

531 Strength ships an update every 2 months, 1 every 3 months. The most recent releases landed on November 1, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | 531 Strength | 1 |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.9 (12K ratings)](https://appshunter.io/ios/app/531-strength/id1062989244/reviews)** | [4.8 (1.1K ratings)](https://appshunter.io/ios/app/1-rm/id1274191954/reviews) |
| Number of ratings | **12K** | 1.1K |
| Positive reviews | **94.0% of reviews** | 39.4% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 26 MB | 47 MB |
| Requires iOS | 18.0 | **10.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 9+ |
| Developer | [Henrik Jachobsen](https://appshunter.io/developer/497731838) | [Bodybuilding.com](https://appshunter.io/developer/380871023) |

## 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


### 1

[App page](https://appshunter.io/ios/app/1-rm/id1274191954)

Easily calculate and track your one-rep max (1RM) for any lift. Estimate your maximum weight safely without testing, and monitor your progress over time with detailed charts. Improve your training with expert articles.

**Highlights:** Calculate 1RM and percentages, Support for various lifts, Track 1RM history with charts, Add notes to calculations, Access expert training articles, Imperial/metric system support

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

**In-app purchases:** none

**What reviewers like**

- 🚀 Great for calculating reps
- 👍 Good, simple app
- 👍 Quick easy to use tool

**What reviewers complain about**

- 🐛 Numbers won't work
- 🐛 Single digit reps only
- 🐛 Links to articles not working
- 🐛 Keeps billing user
- 🐛 Inability to filter exercise history

**Reported bugs**

- Numbers won't work
- Single digit reps only
- Links to articles not working
- Keeps billing user
- Inability to filter exercise history

**Requested features**

- Show max weight for different rep ranges
- Option to count uneven weights
- Display percentages at all times
- Show percentile of max among lifters
- Allow selecting exercise to see PR chart


## Frequently asked questions

### Is 531 Strength free?

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

### Is 1 free?

1 costs $1.99, with no in-app purchases.

### Which has better reviews, 531 Strength or 1?

531 Strength is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while 1 averages 4.8 from 1.1K ratings.

### Do 531 Strength or 1 have ads?

531 Strength shows ads; 1 does not.

### Which is updated more often, 531 Strength or 1?

531 Strength ships an update every 2 months, and 1 every 3 months. Most recently, 531 Strength was updated on November 1, 2026 and 1 on October 29, 2026.

---

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