# BookLight vs ReadAI Smart

The clearest difference is update cadence: BookLight at every 4 days against ReadAI Smart's fortnightly. On price, ads, in-app purchases 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 and ReadAI Smart sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

BookLight ships an update every 4 days, ReadAI Smart fortnightly. Both last shipped on October 28, 2026.

## The numbers

| Metric | BookLight | ReadAI Smart |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Fortnightly |
| Monetization | Free with in-app purchases | — |
| Size | 94 MB | 55 MB |
| Requires iOS | **16.4** | 16.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jungjun Lee](https://appshunter.io/developer/1485806455) | [Vladislav Condratiev](https://appshunter.io/developer/1884070455) |

## 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 |


### ReadAI Smart

[App page](https://appshunter.io/ios/app/readai-smart/id6761624062)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Base Monthly | $6.99 | per month |
| Pro Yearly | $49.99 | per year |


## Frequently asked questions

### Is BookLight free?

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

### Is ReadAI Smart free?

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

### Do BookLight or ReadAI Smart have ads?

Neither BookLight nor ReadAI Smart shows ads.

### Which is updated more often, BookLight or ReadAI Smart?

BookLight ships an update every 4 days, and ReadAI Smart fortnightly. Most recently, BookLight was updated on October 28, 2026 and ReadAI Smart on October 28, 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.*