JabClock vs Metta Timer
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
JabClock
A highly configurable round timer designed for combat sports and interval training. Customize rounds, rest, and alerts for a focused workout. Features glove-friendly controls and offline functionality.
- Configurable rounds and rest periods
- Multiple built-in training presets
- Create and save custom presets
- Variety of sound alerts
- Adjustable volume and haptic feedback
- Glove-friendly shake to pause
- Offline functionality
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JabClock is a precision round timer built for boxing, MMA, Muay Thai, and interval training. Set your rounds, rest periods, and warning alerts — then focus on your workout. FEATURES • Fully configurable rounds, rest duration, preparation countdown, and warning alerts • Five built-in presets: Pro Boxing, Quick Rounds, HIIT Tabata, MMA, and Muay Thai • Create and save unlimited custom presets for any training style • Choose from six distinct sound alerts: bell, buzzer, clap, airhorn, whistle, and beep • Adjustable volume, haptic feedback, and visual flash warnings • Shake to pause — designed for use with boxing gloves on • Proximity sensor support for hands-free pause and resume • Keep Screen On mode so your timer stays visible mid-workout • Clean, glove-friendly interface with large countdown display and round tracking • Works offline with no account required Whether you're training solo at home or timing rounds at the gym, JabClock keeps you on pace so you can stay focused on what matters.
Metta Timer
This app provides a customizable interval timer for various activities like training, meditation, and daily rituals. It offers unique visual styles, text-to-speech cues, and a variety of sounds to enhance focus and presence during practice.
- Customizable interval sequences
- Text-to-speech spoken cues
- Six unique visual styles
- Zen Mode for distraction-free sessions
- Import custom sounds
- Timer presets and history tracking
- Data backup and sharing
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Metta Timer: train, sit, brew. A beautifully crafted interval timer for physical training, meditation, and mindful daily rituals. Set a different photo for every interval — your meditation cushion, the trail ahead, the tea kettle, the stance you're holding — and let each phase of your practice have its own visual anchor. PHOTO BACKGROUNDS FOR EVERY INTERVAL This is what makes Metta Timer different. Assign your own image to each interval in a timer. Not one wallpaper for the whole session, but a unique photo per phase. Warm-up, work, rest, cool down: each can show the image that keeps you focused. Photos display on the Current screen and in Zen Mode fullscreen, with a subtle progress bar so you always know where you are. Share timers with photos embedded in `.mttimer` files so friends and students see your setup before they import. TRAIN Build custom interval sequences with groups and rounds. Chain phases together, each with its own duration, sounds, spoken cues, and photo. Keep your eyes on your practice, not your phone. SIT Gentle temple bells mark your meditation transitions. No jarring alarms. A photo of your altar during sitting, incense or candle visuals during transition, whatever helps you stay present. Swipe to change animated visuals without breaking your session. BREW A mindful bell when your patience is rewarded. A photo of the cup while the water steeps. Set it and forget it. SCHEDULE MODE Plan intervals by clock time, not just duration. Set start and end times for each phase, ideal for a morning routine, timed tea steps, or a class on a schedule. The timer waits until the right moment and can join mid-schedule if you open the app late. SIX ANIMATED VISUALS PLUS PHOTO Breathing Circle, Spiral Incense, Vertical Incense, Diagonal Incense, Hourglass, and Burning Candle, each crafted with care. Or choose Photo on any interval. Mix freely: photo for meditation, hourglass for exercise, candle for cool-down, all in one timer. ZEN MODE Tap the fullscreen icon for a distraction-free screen. Animated visuals fill the darkness; photo intervals go edge-to-edge with time and progress along the bottom. Swipe to cycle styles mid-session. Tap anywhere to exit. TEXT-TO-SPEECH Type any phrase and hear it at the start or end of any interval. Customize voice, speed, and pitch. Works with voice packs on iPhone and Android. SOUNDS Bell, Chime, Gong, Beep, Singing Bowl, Temple Brass Bell, Temple Bell, Temple Chime, Wooden Fish (1x and 3x), Big Temple Bell, Giant Temple Bell. Import your own MP3, M4A, WAV, or AIFF files. TIMER BUILDER Unlimited timers and intervals. Groups organize phases with independent round counts. Per interval: name, duration, color, sounds, announcements, animated visual or photo. Duplicate presets with one tap. Reorder with drag and drop. STREAKS AND HISTORY Completed timers are recorded automatically. Track consecutive practice days, total completions, and total time. Delete individual records anytime. SHARE Send any preset as a `.mttimer` file via AirDrop, Messages, email, Quick Share, or any app. Photos travel with the timer. Recipients preview everything before importing. PRESETS One Minute of Silence, Chan (Zen) Meditation, Brew High Mountain Green Tea, Horse Stance, Kung Fu Stances, and HIIT Training, ready out of the box. Set any preset as your default. BACKUP AND RESTORE Export presets and completion history as JSON. On Android, files save to Downloads automatically. Import presets or merge history onto a new device. PRIVACY All data stays on your device. No accounts. No ads. No tracking. Ever. PERFECT FOR Meditation, mindfulness, breathwork, yoga, HIIT, circuit training, martial arts, tea ceremony, kung fu, qi gong, taiji, Chan, Zen, Pomodoro, and any practice where a picture is worth a thousand reminders. Made with love and care by Metta Grove.
Screenshots
Verdict
The clearest difference is ads: Metta Timer at none against JabClock's shown. Metta Timer also leads on monetization model (free vs ad-supported) and iOS requirement (16.6 vs 18.6). On price, rating, ratings volume and update cadence 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. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for JabClock against 5.0 for Metta Timer. Both are backed by a comparable volume of ratings — 8 and 3 respectively.
JabClock ships an update every 4 days, Metta Timer every 3 days. The most recent releases landed on September 17, 2026 and September 29, 2026 respectively.
| Parameter | JabClock | Metta Timer |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (8 ratings) | 5.0 (3 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 8 — better | 3 |
| Update frequency | Every 4 days | Every 3 days — better |
| Ads | Yes | No — better |
| In-app purchases | No | No |
| Monetization | Ad-supported | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.6 | 16.6 — better |
| Further details — not scored | ||
| Size | 6 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | David Luong | Loc Huynh |
Customer experience
JabClock
Metta Timer
In-app purchases
JabClock
No in-app purchases
Metta Timer
No in-app purchases









