Mastery vs devdex
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Mastery
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- Register the time you have spent so far when you add a skill. No need to count up from 0 minutes. - You can set your favorite color for each skill. - Add as many skills as you like. - When you finish your study, for example, add the time you have worked on it with a few taps.
devdex
This app helps developers practice coding syntax for JavaScript, TypeScript, and Swift. It offers over 200 questions, tracks your progress with a weekly streak, and provides statistics on accuracy and quantity. Links to official language documentation are also included.
- JavaScript, TypeScript, Swift support
- Over 200 practice questions
- Weekly streak tracker
- Accuracy and quantity statistics
- Links to language documentation
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v1.0 Features: - JavaScript, TypeScript, Swift - Over 200 questions - Weekly streak tracker - Accuracy and quantity stats - Links to language docs LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: Mastery at none against devdex's 2. Mastery also leads on update cadence (every 8 days vs every 3 weeks) and iOS requirement (9.0 vs 15.1). devdex's advantage is ads (none vs shown). On price 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. devdex sells 2 in-app purchases, starting at $4.99 per month. Mastery asks for nothing beyond the download.
Mastery ships an update every 8 days, devdex every 3 weeks. The most recent releases landed on October 10, 2026 and October 24, 2026 respectively.
| Parameter | Mastery | devdex |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 8 days — better | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 9.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 56 MB | 41 MB |
| Age rating | 4+ | 4+ |
| Developer | Yudai Abe | Trevor Pennington |
In-app purchases
Mastery
No in-app purchases
devdex
- Devdex Monthly$4.991 Month
- Devdex - Yearly$34.991 Year
