# Bibliobooks vs Celer

The clearest difference is in-app purchases: Bibliobooks at none against Celer's 4. Bibliobooks also leads on iOS requirement (9.0 vs 17.0). Celer's advantage is update cadence (every 10 days vs every 3 weeks). On price, 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. Bibliobooks asks for nothing beyond the download.

Bibliobooks ships an update every 3 weeks, Celer every 10 days. The most recent releases landed on October 9, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Bibliobooks | Celer |
| --- | --- | --- |
| 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 | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 10 days** |
| Monetization | — | Freemium |
| Size | 66 MB | 62 MB |
| Requires iOS | **9.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Digital Books S.L.](https://appshunter.io/developer/562198775) | [Mobile Craft MB](https://appshunter.io/developer/1299128266) |

## What reviewers say

### Bibliobooks

[App page](https://appshunter.io/ios/app/bibliobooks/id1118343811)

**Features:** macOS Compatibility

**In-app purchases:** none


### Celer

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

Enhance your reading speed, focus, and comprehension with a scientifically-backed method. This app offers an immersive environment and assistive technology to help you absorb information faster and retain it better. It's an essential tool for students, professionals, and individuals with neurodivergent reading needs.

**Highlights:** Read 2-3x faster, Sharpen focus with immersive environment, Boost memory and retention, Assistive tool for ADHD & Dyslexia, Import EPUB, PDF, mobi, rtf, txt, Read articles and web content, Customizable themes

**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 |


## Frequently asked questions

### Is Bibliobooks free?

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

### Is Celer free?

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

### Do Bibliobooks or Celer have ads?

Neither Bibliobooks nor Celer shows ads.

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

Bibliobooks ships an update every 3 weeks, and Celer every 10 days. Most recently, Bibliobooks was updated on October 9, 2026 and Celer on October 8, 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.*