# OpenBook vs PUMPZZ

The clearest difference is update cadence: PUMPZZ at every 4 days against OpenBook's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. OpenBook sells 2 in-app purchases, starting at $3.99 per month and PUMPZZ sells 5 in-app purchases, starting at $2.99 per 7 days. Whichever you choose, the download price is not the number that matters.

OpenBook ships an update every 2 weeks, PUMPZZ every 4 days. The most recent releases landed on October 14, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | OpenBook | PUMPZZ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (25 ratings)](https://appshunter.io/ios/app/pumpzz-gym-workout-tracker/id6759228538/reviews)** |
| Number of ratings | — | **25** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 2 weeks | **Every 4 days** |
| Monetization | — | Free with in-app purchases |
| Size | 55 MB | 161 MB |
| Requires iOS | 15.5 | **15.1** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [OpenArcX Pty Ltd](https://appshunter.io/developer/1870700465) | [Alex Tirim](https://appshunter.io/developer/1855322163) |

## What reviewers say

### OpenBook

[App page](https://appshunter.io/ios/app/openbook-workout-tracker/id6758069172)

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OpenBook Full Access - Monthly | $3.99 | per month |
| OpenBook Full Access - Yearly | $29.99 | per year |


### PUMPZZ

[App page](https://appshunter.io/ios/app/pumpzz-gym-workout-tracker/id6759228538)

This app guides your gym workouts by suggesting weights and reps for each set. It automatically adjusts your training based on your progress, allowing for flexible workout modifications and detailed logging of various set types. Access a large exercise library with offline capabilities.

**Highlights:** AI-driven weight and rep suggestions, Adaptable workout scheduling, Detailed set type logging, Plate calculator, Offline exercise library, Progressive overload tracking

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Repstack Pro Weekly | $2.99 | per 7 days |
| Repstack Pro Monthly | $9.99 | per month |
| Repstack Pro Yearly | $39.99 | per year |
| Repstack Pro Yearly Exit | $39.99 | per year |
| Repstack Pro Lifetime | $119.99 | one-time |


## Frequently asked questions

### Is OpenBook free?

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

### Is PUMPZZ free?

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

### Do OpenBook or PUMPZZ have ads?

Both OpenBook and PUMPZZ show ads.

### Which is updated more often, OpenBook or PUMPZZ?

OpenBook ships an update every 2 weeks, and PUMPZZ every 4 days. Most recently, OpenBook was updated on October 14, 2026 and PUMPZZ on October 18, 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.*