Casty vs Calculus Gacha！
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Casty
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.
- Convert PDFs to podcasts
- Live transcripts
- Built-in dictionary
- Offline listening
- Japanese and English support
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Convert PDF files into educational podcasts in Japanese or English Live transcript with built-in dictionary. Offline listening available after generation.
Calculus Gacha！
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● Fun, Gacha-Style Learning Tackle randomly selected questions and instantly check explanations and formulas as you go. ●AI Tutor Stuck on a problem? Ask the built-in AI tutor for a hint, a solving strategy, just the first step, or an explanation using a simpler similar problem — all tailored to the question you're working on. ● Learn by Topic Integration, limits, factorization, indeterminate equations, recurrence relations, differential equations, and more. Each topic is organized into categories so you can focus on exactly what you want to study. ● Helpful Support Features Hints, scratch paper, a timer, and other tools make learning smoother and more efficient. ● Automatic Study Tracking All solved questions are saved on your device, allowing you to review your progress and understanding anytime. ● Smart Question Selection Based on your learning history, the app prioritizes topics you struggle with, helping you learn more efficiently. --------------------------- Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.notion.so/calculus-gacha-joy-math-27ae4f0afd3b80cb9754ce138cbc80ca?source=copy_link
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Casty | Calculus Gacha！ |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 2 days — better | Every 3 days |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 23 MB | 83 MB |
| Age rating | 4+ | 4+ |
| Developer | Wai Yip Li | Shunsuke Nakamura |
In-app purchases
Casty
No in-app purchases
Calculus Gacha！
- 不定方程式ガチャ利用オプション$0.99
- AI Tutor Pass$2.99
- AI Tutor Plus(500)$2.99
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- 履歴管理機能オプション$2.99
