# indexx vs BookSynapse

The clearest difference is update cadence: BookSynapse at every 2 days against indexx's every 3 months. BookSynapse also leads on iOS requirement (15.0 vs 26.0). On price, ads, in-app purchases and device support there is nothing between them.

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

indexx ships an update every 3 months, BookSynapse every 2 days. The most recent releases landed on October 12, 2026 and October 18, 2026 respectively.

## The numbers

| Metric | indexx | BookSynapse |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 days** |
| Monetization | Ad-supported | — |
| Size | 4 MB | 6 MB |
| Requires iOS | 26.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [OKMIN LEE](https://appshunter.io/developer/1501145758) | [Jihye Shin](https://appshunter.io/developer/1895853325) |

## What reviewers say

### indexx

[App page](https://appshunter.io/ios/app/indexx/id6757661654)

Capture, organize, and share impactful sentences from books. This app uses OCR to extract text from photos or allows manual entry, linking each quote to its source and your reflections. Create shareable quote cards and track your reading journey with a personal library.

**Highlights:** Capture sentences via OCR or manual entry, Link quotes to book, page, and reflections, Generate shareable quote cards, Track reading progress and history, Barcode scanner for book registration, Personal sentence library

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

**In-app purchases:** none


### BookSynapse

[App page](https://appshunter.io/ios/app/booksynapse/id6764621912)

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

**In-app purchases:** none


## Frequently asked questions

### Is indexx free?

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

### Is BookSynapse free?

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

### Do indexx or BookSynapse have ads?

Neither indexx nor BookSynapse shows ads.

### Which is updated more often, indexx or BookSynapse?

indexx ships an update every 3 months, and BookSynapse every 2 days. Most recently, indexx was updated on October 12, 2026 and BookSynapse 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.*