# 531 Strength vs Built to Scale

The clearest difference is in-app purchases: Built to Scale at none against 531 Strength's 4. Built to Scale also leads on ads (none vs shown) and update cadence (weekly vs every 2 months). 531 Strength's advantage is ratings volume (12K vs 2). On price, rating, review sentiment and device support there is nothing between them.

Both are free to download. 531 Strength sells 4 one-off in-app purchases. Built to Scale asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for 531 Strength against 5.0 for Built to Scale. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 2, 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 100% of Built to Scale's.

531 Strength ships an update every 2 months, Built to Scale weekly. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 531 Strength | Built to Scale |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (12K ratings)](https://appshunter.io/ios/app/531-strength/id1062989244/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/built-to-scale-wod-tracker/id6761081387/reviews)** |
| Number of ratings | **12K** | 2 |
| Positive reviews | 94.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 26 MB | 14 MB |
| Requires iOS | 18.0 | **15.4** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Henrik Jachobsen](https://appshunter.io/developer/497731838) | [Steven Gill](https://appshunter.io/developer/1887695230) |

## 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


### Built to Scale

[App page](https://appshunter.io/ios/app/built-to-scale-wod-tracker/id6761081387)

This app helps you log and track your fitness workouts, focusing on your personal progress and consistency. It analyzes your training patterns to help you maximize each session and earn achievements for building habits. The app captures your actual performance without prescribing specific routines or judging modifications.

**Highlights:** Log workouts and track movements, Analyze workload trends and demand signals, Earn achievements for consistency, View effort across movement groups, No prescribed programming or judgment, Personal data privacy and cloud backup option

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 531 Strength free?

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

### Is Built to Scale free?

Built to Scale is free to download, with no in-app purchases.

### Which has better reviews, 531 Strength or Built to Scale?

Built to Scale is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while Built to Scale averages 5.0 from 2 ratings.

### Do 531 Strength or Built to Scale have ads?

531 Strength shows ads; Built to Scale does not.

### Which is updated more often, 531 Strength or Built to Scale?

531 Strength ships an update every 2 months, and Built to Scale weekly. Most recently, 531 Strength was updated on November 6, 2026 and Built to Scale on October 31, 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.*