# BookLight vs ReadGem

The clearest difference is in-app purchases: ReadGem at none against BookLight's 3. BookLight's advantage is iOS requirement (15.1 vs 17.6). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. BookLight sells 3 in-app purchases, starting at $0.99 per month. ReadGem asks for nothing beyond the download.

BookLight ships an update every 5 days, ReadGem every 4 days. The most recent releases landed on September 18, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | BookLight | ReadGem |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 76 MB | 27 MB |
| Requires iOS | **15.1** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jungjun Lee](https://appshunter.io/developer/1485806455) | [NEXTAOI, Inc](https://appshunter.io/developer/1748938499) |

## What reviewers say

### BookLight

[App page](https://appshunter.io/ios/app/booklight-epub-translator/id6759386987)

This app helps language learners build vocabulary by translating words with a single tap while reading EPUB, PDF, or TXT files. It automatically saves new words and uses spaced repetition flashcards to aid memorization, eliminating the need for manual flashcard creation or app switching.

**Highlights:** Tap to translate words instantly, Automatic vocabulary saving, Spaced-repetition flashcards, Import EPUB, PDF, TXT files, Offline reading support, Customizable reading themes and fonts, Pronunciation audio

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Plan | $0.99 | per month |
| Yearly Plan | $7.99 | per year |
| Lifetime Plan | $9.99 | one-time |


### ReadGem

[App page](https://appshunter.io/ios/app/readgem-read-learn-languages/id6770457167)

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

**In-app purchases:** none


## Frequently asked questions

### Is BookLight free?

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

### Is ReadGem free?

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

### Do BookLight or ReadGem have ads?

Neither BookLight nor ReadGem shows ads.

### Which is updated more often, BookLight or ReadGem?

BookLight ships an update every 5 days, and ReadGem every 4 days. Most recently, BookLight was updated on September 18, 2026 and ReadGem on September 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.*