# Flex vs Notebook

The clearest difference is in-app purchases: Flex at none against Notebook's 2. Notebook's advantage is update cadence (every 2 weeks vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Notebook sells 2 in-app purchases, starting at $14.99 per month. Flex asks for nothing beyond the download.

Flex ships an update every 3 months, Notebook every 2 weeks. The most recent releases landed on August 5, 2026 and August 17, 2026 respectively.

## The numbers

| Metric | Flex | Notebook |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 weeks** |
| Size | 23 MB | 24 MB |
| Requires iOS | **17.6** | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [sean ELLISON](https://appshunter.io/developer/1471381369) | [Stanislav Ponamorenko](https://appshunter.io/developer/1830031506) |

## What reviewers say

### Flex

[App page](https://appshunter.io/ios/app/flex-ability-concepts/id6478976363)

**Features:** macOS Compatibility

**In-app purchases:** none


### Notebook

[App page](https://appshunter.io/ios/app/notebook-ai-voice-notes/id6753011789)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly access | $14.99 | per month |
| Annual access | $59.99 | per year |


## Frequently asked questions

### Is Flex free?

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

### Is Notebook free?

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

### Do Flex or Notebook have ads?

Neither Flex nor Notebook shows ads.

### Which is updated more often, Flex or Notebook?

Flex ships an update every 3 months, and Notebook every 2 weeks. Most recently, Flex was updated on August 5, 2026 and Notebook on August 17, 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.*