Demon Time vs Mastery Timer
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
Demon Time
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Every hour you grind feeds your demon. Demon Time is a focus timer that transforms your practice hours into a dark, addictive progression system. Track time on any skill or project, watch your demon evolve through 8 ranks โ from a tiny Ember to a fearsome Demon Lord โ and maintain your Possession Chain to prove you're built different. Inspired by the 10,000 hour rule, Demon Time makes the long grind feel rewarding from day one. Each session is a Ritual. Each project is a Demon you're raising. Skip a day and your demon starts rusting. Neglect it for a month and it begins to starve. But show up consistently? Your demon evolves, your rank ascends, and you earn Souls to customize your experience. SUMMONING CIRCLE TIMER Start The Ritual and watch the summoning circle track your session with rotating runes, glowing progress arcs, and floating ember particles. This isn't a boring countdown โ it's a ceremony. 8 DEMON RANKS Evolve from Ember (0h) to Demon Lord (10,000h). Each rank transforms your demon's visual form โ growing horns, wings, orbiting runes, and reality-warping effects as you ascend. LIVING DEMON MASCOTS Your demon lives inside the summoning circle. It thrives when you grind, dims when you slack, rusts when you disappear, and starves if you abandon it. Feed it or watch it die. POSSESSION CHAINS Maintain your streak by logging at least one session every day. Watch your chain grow from Sparked (3 days) to Immortal (365 days). Break it and feel the pain. SCROLLS (INSIGHTS) Discover when you're most productive, which sessions hit flow state, and how your hours compare week over week. Data presented as ancient wisdom from the underworld. RELICS (ACHIEVEMENTS) Unlock 30+ achievements โ from First Blood (1 hour) to Dawn Breaker (session that starts before midnight and ends after 5am). Each relic earns Souls. SOUL ECONOMY Earn Souls through grinding and spend them on cosmetic upgrades โ summoning circle skins, timer animations, ambient soundscapes, and profile flair. TRUE DEMON TIME Sessions between 12am and 5am earn bonus Souls and a special visual mode. The app knows when you're on demon time. Built for developers, musicians, artists, writers, students, and anyone tracking their 10,000-hour journey. Dark mode only. No ads in the free tier. Your grind deserves better than a pastel timer. Feed your demons. Keywords : focus,timer,productivity,hours,tracker,10000,pomodoro,streak,grind,study,practice,skill,habit,dark
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 in-app purchases: Demon Time at none against Mastery Timer's 1. Demon Time also leads on device support (4 vs 1). On price, ads and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Mastery Timer sells 1 one-off in-app purchase. Demon Time asks for nothing beyond the download.
| Parameter | Demon Time | Mastery Timer |
|---|---|---|
| Price | Free | Free |
| Update frequency | โ | Every 2 days |
| Ads | No | No |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad, Apple Watch, Vision Pro โ better | iPhone |
| Requires iOS | 17.6 | 16.4 โ better |
| Further details โ not scored | ||
| Size | 18 MB | 55 MB |
| Age rating | 17+ | 4+ |
| Developer | Sahil Chaddha | Arjun Gupte |
In-app purchases
Demon Time
No in-app purchases
Mastery Timer
- Friends$1.99








