# 531 Strength vs Armstrong Pull

The clearest difference is review sentiment: 531 Strength at 94% against Armstrong Pull's 25%. 531 Strength also leads on rating (4.9 vs 2.0) and ratings volume (12K vs 3). Armstrong Pull's advantage is in-app purchases (none vs 4) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

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

531 Strength holds the better App Store score, 4.9 against 2.0. That said, the two scores are not equally well evidenced: 531 Strength has 12K ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 94% of 531 Strength's written reviews are positive against 25% of Armstrong Pull's.

531 Strength ships an update every 2 months, Armstrong Pull every 4 weeks. The most recent releases landed on October 31, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | 531 Strength | Armstrong Pull |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.9 (12K ratings)](https://appshunter.io/ios/app/531-strength/id1062989244/reviews)** | [2.0 (3 ratings)](https://appshunter.io/ios/app/armstrong-pull-up/id1530660333/reviews) |
| Number of ratings | **12K** | 3 |
| Positive reviews | **94.0% of reviews** | 25.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 26 MB | 88 MB |
| Requires iOS | 18.0 | **10.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Henrik Jachobsen](https://appshunter.io/developer/497731838) | [Mooncheon Song](https://appshunter.io/developer/625976926) |

## 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


### Armstrong Pull

[App page](https://appshunter.io/ios/app/armstrong-pull-up/id1530660333)

This application provides a structured visual guide for the Armstrong Pullup Program. It outlines daily routines, including maximum effort sets, pyramid training, and varied grip techniques, to help users progressively increase their pull-up numbers.

**Highlights:** Daily workout routines, Maximum effort set tracking, Pyramid training guide, Varied grip training, Visual progress guide, Repeat hardest day option

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

**In-app purchases:** none


## Frequently asked questions

### Is 531 Strength free?

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

### Is Armstrong Pull free?

Armstrong Pull is free to download, with no in-app purchases.

### Which has better reviews, 531 Strength or Armstrong Pull?

531 Strength is rated higher. 531 Strength averages 4.9 out of 5 from 12K ratings, while Armstrong Pull averages 2.0 from 3 ratings.

### Do 531 Strength or Armstrong Pull have ads?

531 Strength shows ads; Armstrong Pull does not.

### Which is updated more often, 531 Strength or Armstrong Pull?

531 Strength ships an update every 2 months, and Armstrong Pull every 4 weeks. Most recently, 531 Strength was updated on October 31, 2026 and Armstrong Pull on October 24, 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.*