# Calculator AI vs EPUB Reader

The clearest difference is price: Calculator AI at Free against EPUB Reader's $0.99. Calculator AI also leads on update cadence (every 8 days vs every 3 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Calculator AI is free to download; EPUB Reader costs $0.99 up front. Calculator AI sells 2 in-app purchases, starting at $9.99 per 7 days and EPUB Reader sells 3 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Calculator AI ships an update every 8 days, EPUB Reader every 3 months. The most recent releases landed on October 24, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Calculator AI | EPUB Reader |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 3 months |
| Size | 11 MB | 15 MB |
| Requires iOS | **17.0** | 17.6 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Aya Labs B.V.](https://appshunter.io/developer/1505783699) | [乐祥 胡](https://appshunter.io/developer/1572365721) |

## What reviewers say

### Calculator AI

[App page](https://appshunter.io/ios/app/calculator-ai-math-solver/id6747848256)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Calculator AI Pro | $9.99 | per 7 days |
| Calculator AI Pro | $9.99 | per 7 days |


### EPUB Reader

[App page](https://appshunter.io/ios/app/epub-reader-for-epub-book/id6756795788)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Insight Reader Premium - weekly | $0.99 | per 7 days |
| Insight Reader Premium - yearly | $39.99 | per year |
| EPUB365 Premium  - lifetime | $59.99 | one-time |


## Frequently asked questions

### Is Calculator AI free?

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

### Is EPUB Reader free?

EPUB Reader costs $0.99, and also offers in-app purchases.

### Do Calculator AI or EPUB Reader have ads?

Neither Calculator AI nor EPUB Reader shows ads.

### Which is updated more often, Calculator AI or EPUB Reader?

Calculator AI ships an update every 8 days, and EPUB Reader every 3 months. Most recently, Calculator AI was updated on October 24, 2026 and EPUB Reader on October 30, 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.*