# OneBook vs Echolangs

The clearest difference is iOS requirement: OneBook at 15.0 against Echolangs's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. OneBook sells 2 in-app purchases, starting at $8.00 per month and Echolangs sells 3 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

OneBook ships an update every 9 days, Echolangs every 6 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | OneBook | Echolangs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (62 ratings)](https://appshunter.io/ios/app/onebook-learnmultilingual-hub/id6749743594/reviews)** | — |
| Number of ratings | **62** | — |
| Positive reviews | 97.3% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 6 days** |
| Monetization | Free | — |
| Size | 224 MB | 7 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [翊 林](https://appshunter.io/developer/1803147015) | [Gang Huang](https://appshunter.io/developer/1891838016) |

## What reviewers say

### OneBook

[App page](https://appshunter.io/ios/app/onebook-learnmultilingual-hub/id6749743594)

This app helps you read physical books by scanning pages to provide definitions and pronunciations without an internet connection. It preserves the original layout for a comfortable reading experience, free from glare.

**Highlights:** Scan physical books, Offline word lookup, Hear pronunciations, Preserve original layout, Glare-free reading

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| OneBook Premium Monthly | $8.00 | per month |
| AI Pack 1000 | $5.00 | one-time |


### Echolangs

[App page](https://appshunter.io/ios/app/echolangs/id6761864373)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Echolangs Pro | $1.99 | per month |
| Monthly Access | $3.99 | per month |
| EchoLangs Pro 1 Year | $34.99 | per year |


## Frequently asked questions

### Is OneBook free?

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

### Is Echolangs free?

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

### Do OneBook or Echolangs have ads?

Neither OneBook nor Echolangs shows ads.

### Which is updated more often, OneBook or Echolangs?

OneBook ships an update every 9 days, and Echolangs every 6 days. Most recently, OneBook was updated on October 28, 2026 and Echolangs on October 24, 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.*