# Celer vs BookSync

The clearest difference is in-app purchases: BookSync at none against Celer's 4. BookSync also leads on iOS requirement (15.6 vs 18.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Celer sells 4 in-app purchases, starting at $7.99 per month. BookSync asks for nothing beyond the download.

Celer ships an update every 9 days, BookSync every 6 days. The most recent releases landed on October 30, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | Celer | BookSync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (21 ratings)](https://appshunter.io/ios/app/celer-adhd-and-focus-reader/id1641298256/reviews)** | — |
| Number of ratings | **21** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 6 days** |
| Monetization | Freemium | — |
| Size | 117 MB | 40 MB |
| Requires iOS | 18.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Mobile Craft MB](https://appshunter.io/developer/1299128266) | [Jwan Haj Sulaiman](https://appshunter.io/developer/1681381795) |

## What reviewers say

### Celer

[App page](https://appshunter.io/ios/app/celer-adhd-and-focus-reader/id1641298256)

This reading app uses guided highlighting to help users maintain focus and comprehension, especially beneficial for those with ADHD or dyslexia. It supports various file formats and offers a distraction-free environment to help you finish books and articles.

**Highlights:** Guided highlighting for focus, Adjustable reading pace, Distraction-free screen, Import EPUB, PDF, MOBI, RTF, TXT, Built-in RSS reader, Notes and highlights

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium month | $7.99 | per month |
| Premium quarter | $17.99 | per 3 months |
| Premium Year | $34.99 | per year |
| Premium Year Plan | $79.99 | per year |


### BookSync

[App page](https://appshunter.io/ios/app/booksync-read-together/id6813833270)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Celer free?

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

### Is BookSync free?

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

### Do Celer or BookSync have ads?

Neither Celer nor BookSync shows ads.

### Which is updated more often, Celer or BookSync?

Celer ships an update every 9 days, and BookSync every 6 days. Most recently, Celer was updated on October 30, 2026 and BookSync on October 15, 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.*