# Fast Idea Book vs ObSort

The clearest difference is in-app purchases: Fast Idea Book at none against ObSort's 2. ObSort's advantage is update cadence (every 4 days vs monthly). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ObSort sells 2 in-app purchases, starting at $1.99 per month. Fast Idea Book asks for nothing beyond the download.

Fast Idea Book ships an update monthly, ObSort every 4 days. Both last shipped on October 30, 2026.

## The numbers

| Metric | Fast Idea Book | ObSort |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fast-idea-book/id6749139776/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 3 MB |
| Requires iOS | 18.5 | **17.6** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Bahattin Duran](https://appshunter.io/developer/1677311418) | [Hanquan Liang](https://appshunter.io/developer/1607751967) |

## What reviewers say

### Fast Idea Book

[App page](https://appshunter.io/ios/app/fast-idea-book/id6749139776)

Quickly capture fleeting thoughts via text, voice, or photo with a single tap. Access your ideas through widgets, the Share Sheet, or Siri. Organize and review them later, with advanced features unlocked via subscription.

**Highlights:** One-tap text, voice, and photo capture, Home Screen capture widget, Share Sheet integration, On-device voice transcription, Tags and quick review, Siri integration, iCloud sync

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

**In-app purchases:** none


### ObSort

[App page](https://appshunter.io/ios/app/obsort/id6753699464)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ObSort Pro Monthly | $1.99 | per month |
| ObSort Pro Lifetime | $4.99 | one-time |


## Frequently asked questions

### Is Fast Idea Book free?

Fast Idea Book is free to download, with no in-app purchases.

### Is ObSort free?

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

### Do Fast Idea Book or ObSort have ads?

Neither Fast Idea Book nor ObSort shows ads.

### Which is updated more often, Fast Idea Book or ObSort?

Fast Idea Book ships an update monthly, and ObSort every 4 days. Most recently, Fast Idea Book was updated on October 30, 2026 and ObSort on October 30, 2026.

---

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