MSDC vs Calculus Gacha!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MSDC
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MSDC - 蒙古语语音数据采集应用 通过MSDC采集来自内蒙古,青海,新疆等地蒙古语使用者的语音数据。 用于蒙古族语音识别,语音输入,语音合成及蒙古语教育等领域的研发。 支持的方言:察哈尔,额济纳,巴林,科尔沁,喀喇沁,鄂尔多斯,土尔扈特,青海,布里亚特及其他。 ■合作单位: 株式会社阿拉慕斯 YouTeacher株式会社 日本蒙古族信息技术协会
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: MSDC at none against Calculus Gacha!'s 3. MSDC also leads on iOS requirement (11.0 vs 13.0). Calculus Gacha!'s advantage is update cadence (every 2 days vs every 2 weeks). On price, 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 3 one-off in-app purchases. MSDC asks for nothing beyond the download.
MSDC ships an update every 2 weeks, Calculus Gacha! every 2 days. The most recent releases landed on September 15, 2026 and August 16, 2026 respectively.
| Parameter | MSDC | Calculus Gacha! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 11 MB | 81 MB |
| Age rating | 4+ | 4+ |
| Developer | YouTeacher Inc. | Shunsuke Nakamura |
In-app purchases
MSDC
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 Plus(500)$2.99
- 履歴管理機能オプション$2.99









