# Casty vs Calculus Gacha！

The clearest difference is in-app purchases: Casty at none against Calculus Gacha！'s 4. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Calculus Gacha！ sells 4 one-off in-app purchases. Casty asks for nothing beyond the download.

Casty ships an update every 2 days, Calculus Gacha！ every 3 days. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Casty | Calculus Gacha！ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/casty/id6740439860/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Free | — |
| Size | 23 MB | 83 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Wai Yip Li](https://appshunter.io/developer/1789980681) | [Shunsuke Nakamura](https://appshunter.io/developer/1828229182) |

## What reviewers say

### Casty

[App page](https://appshunter.io/ios/app/casty/id6740439860)

Transform PDF documents into engaging podcasts with live transcripts and a built-in dictionary. Listen offline to educational content in Japanese or English after generation.

**Highlights:** Convert PDFs to podcasts, Live transcripts, Built-in dictionary, Offline listening, Japanese and English support

**Features:** macOS Compatibility

**In-app purchases:** none


### Calculus Gacha！

[App page](https://appshunter.io/ios/app/calculus-gacha/id6753078774)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 不定方程式ガチャ利用オプション | $0.99 | one-time |
| AI Tutor Pass | $2.99 | one-time |
| AI Tutor Plus(500) | $2.99 | one-time |
| 履歴管理機能オプション | $2.99 | one-time |


## Frequently asked questions

### Is Casty free?

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

### Is Calculus Gacha！ free?

Calculus Gacha！ is free to download, with in-app purchases available.

### Do Casty or Calculus Gacha！ have ads?

Neither Casty nor Calculus Gacha！ shows ads.

### Which is updated more often, Casty or Calculus Gacha！?

Casty ships an update every 2 days, and Calculus Gacha！ every 3 days. Most recently, Casty was updated on October 18, 2026 and Calculus Gacha！ 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.*