# Paul's Strength Book vs Flexibull

Paul's Strength Book and Flexibull are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly fortnightly. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Paul's Strength Book | Flexibull |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | Fortnightly |
| Size | 76 MB | 78 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [The PBE Group PTY LTD](https://appshunter.io/developer/1688607754) | [Flexibull Fitness](https://appshunter.io/developer/1816282485) |

## What reviewers say

### Paul's Strength Book

[App page](https://appshunter.io/ios/app/pauls-strength-book/id6449305088)

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

**In-app purchases:** none


### Flexibull

[App page](https://appshunter.io/ios/app/flexibull/id6746347632)

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

**In-app purchases:** none


## Frequently asked questions

### Is Paul's Strength Book free?

Paul's Strength Book is free to download, with no in-app purchases.

### Is Flexibull free?

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

### Do Paul's Strength Book or Flexibull have ads?

Neither Paul's Strength Book nor Flexibull shows ads.

### Which is updated more often, Paul's Strength Book or Flexibull?

Paul's Strength Book ships an update fortnightly, and Flexibull fortnightly. Most recently, Paul's Strength Book was updated on November 7, 2026 and Flexibull on November 8, 2026.

---

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