# Gaubook vs Prompt Optimizer

The clearest difference is in-app purchases: Gaubook at none against Prompt Optimizer's 5. Prompt Optimizer's advantage is update cadence (every 4 days vs weekly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Prompt Optimizer sells 5 in-app purchases, starting at $2.99 per month. Gaubook asks for nothing beyond the download.

Gaubook ships an update weekly, Prompt Optimizer every 4 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Gaubook | Prompt Optimizer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Weekly | **Every 4 days** |
| Size | 61 MB | 44 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CapriTech Global Services](https://appshunter.io/developer/1710698729) | [VideoMeet Private Limited](https://appshunter.io/developer/1588056376) |

## What reviewers say

### Gaubook

[App page](https://appshunter.io/ios/app/gaubook/id6760097483)

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

**In-app purchases:** none


### Prompt Optimizer

[App page](https://appshunter.io/ios/app/prompt-optimizer/id6760383819)

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro - Monthly | $2.99 | per month |
| Pro - Quarterly | $9.99 | per 3 months |
| Starter - 30 Credits | $0.99 | one-time |
| Growth - 75 Credits | $1.99 | one-time |
| Pro Pack - 180 Credits | $3.99 | one-time |


## Frequently asked questions

### Is Gaubook free?

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

### Is Prompt Optimizer free?

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

### Do Gaubook or Prompt Optimizer have ads?

Neither Gaubook nor Prompt Optimizer shows ads.

### Which is updated more often, Gaubook or Prompt Optimizer?

Gaubook ships an update weekly, and Prompt Optimizer every 4 days. Most recently, Gaubook was updated on October 31, 2026 and Prompt Optimizer 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.*