Keep Time! vs Mastery Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Keep Time!
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1.Simple To-Do List 2.Easy To Trace Your Time 3.Statical Analisis 4.Remind You To Execute Your Plan 5.Pomodoro Technique 6.Procrastination Killer This App, Free ,No advertisement ,No Pay in it, Ever No remind comment.If you think it 's good , bad, or something you want to tell the maker, Comment it ,email : ibowandarrow@163.com, Thank you very much. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Mastery Timer
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Mastery Timer turns the time you spend getting good at something into visible progress. Pick the skills you want to master. Writing, reading, an instrument, a language, a sport, meditation, anything. Give each one a daily goal, and fill its bar a little more every day. Every minute counts toward the bigger picture: the path to 10,000 hours of mastery. As your hours add up you rise through 25 ranks, from your very first session to true mastery, and the app tells you something new at every single hour. Not only at the milestones, every hour. What is shifting in your craft, what you have unlocked, how far you have come. No points to lose. No guilt. No streaks that punish you for a missed day. Lifetime hours and ranks only ever go up. If you skip a day, a streak simply starts again, quietly. Mastery Timer is built for years of use, not for a quick hit. Features - Create as many skills as you want, each with its own daily goal - A clean bar you fill each day, with a gentle gong when you reach your goal - A lifetime mastery view: your hours, your current rank, and encouragement that changes every hour - Tailored progress for each kind of skill, from writing to music to fitness - Fully offline and private. Your practice stays on your device. No account, no data collected - A calm, distraction free design The work is the point. Mastery Timer just makes the hours add up where you can see them.
Screenshots
Verdict
The clearest difference is update cadence: Mastery Timer at every 2 days against Keep Time!'s every 5 weeks. Keep Time!'s advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.4). On price, ads and in-app purchases 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. Keep Time! sells 1 in-app purchase, starting at $1.99 per year and Mastery Timer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Keep Time! ships an update every 5 weeks, Mastery Timer every 2 days. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Keep Time! | Mastery Timer |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 5 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 12.0 — better | 16.4 |
| Further details — not scored | ||
| Size | 4 MB | 55 MB |
| Age rating | 4+ | 4+ |
| Developer | 锡蕃 林 | Arjun Gupte |
In-app purchases
Keep Time!
- Annually7 Days trial$1.991 Year
Mastery Timer
- Friends$1.99









