Seconds Interval Timer vs TimerNinja
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Seconds Interval Timer
This app provides a versatile interval timer for various workout types like Tabata, HIIT, and circuit training. It features a clear, full-screen display, customizable alerts, and background operation. Users can also utilize a stopwatch and countdown timer, with integration for Apple Health.
- Full-screen colored display
- Templates for HIIT, Tabata, Circuit Training
- Voice and audio alerts
- Music assignment per interval
- Background operation
- Apple Health integration
- Stopwatch and countdown timer
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Seconds is an interval timer for HIIT, Tabata, EMOM, circuits and any workout built from timed intervals. It calls each interval out loud, keeps running with the screen off, and runs on iPhone, iPad and Apple Watch. Apple has featured it, and Joe Wicks, The Body Coach, has said it is the fitness app he uses more than any other. BUILD ANY WORKOUT - Start from a HIIT, Tabata or circuit template, or build a timer from scratch with sets, rounds and intervals of different lengths. - Chain timers into one compound timer, so a warm-up flows into the main set and then a cool-down. - Color-code every interval so you know what is coming before the beep. - Share a timer with a friend in one tap. HEAR IT, DON'T WATCH IT - Voice cues call out each interval by name and warn you before the next one starts. - Beeps and bells are there too if you would rather not be talked at. - Play your own music, per timer or per interval. Cues duck the music and it comes back up when they are done. - The timer keeps going in the background while you use other apps or the screen sleeps. ON THE GYM FLOOR - A full-screen, color-coded display you can read from across the room, in portrait or landscape. On iPad it uses the whole screen. - A lock button stops a stray tap from pausing your set. APPLE WATCH - Seconds runs on the watch by itself, so the phone can stay in the locker. Timers you build on the phone sync to the wrist, and Quick Intervals builds a basic circuit on the watch itself. MORE TIMERS - A stopwatch that marks your best and worst laps. - A countdown timer with five preset durations (three on Apple Watch). APPLE HEALTH - Save workouts and mindful sessions to Health. With a heart rate monitor connected, Seconds reads your body measurements and year of birth from Health to estimate calories burned. FREE TO TRY, ONE PAYMENT TO UNLOCK - Everything is available from the first launch. Build any timer and run it. - Each timer locks after you run it once. A single in-app purchase removes the lock on every timer you make. SECONDS AND SECONDS PRO - Seconds Pro is the same app, paid once up front, with nothing to unlock. The two are separate products and a purchase in one does not carry over to the other. If you bought Seconds Pro, download Seconds Pro. If you bought the unlock in Seconds, download Seconds and use Restore Purchases.
TimerNinja
Track time for workouts and productivity with versatile timer options. Supports Apple Watch integration, Apple Health recording, and SharePlay for synchronized challenges with friends. Offers customizable themes and multiple timer types.
- Multiple timer types (Stopwatch, Countdown, Intervals, EMOM, Pomodoro)
- Apple Watch standalone app and remote control
- Record workouts to Apple Health
- SharePlay for synchronized workouts with friends
- Customizable dark and light themes
- Standalone Apple Watch app
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TimerNinja is the simple, flexible interval timer for workouts, training sessions, and any other timed activity — on iPhone, iPad, Apple Watch, Apple TV, Mac, and Apple Vision Pro. TIMERS FOR EVERY ACTIVITY • Stopwatch — count up, with an optional time cap • Timer — a simple countdown • Intervals — work/rest rounds • Multi-interval — chain interval groups together • EMOM — Every Minute On the Minute • Tabata — 20 seconds on, 10 seconds off • Pomodoro — focus and break cycles (Plus) • Custom — build anything with nested, repeating intervals (Plus) YOUR TIMER, EVERYWHERE • Live Activities keep your timer on the Lock Screen and in the Dynamic Island • Start your favorite timers from Home Screen and Lock Screen widgets • Control Center controls let you start, pause, and resume without opening the app • Siri & Shortcuts: start any saved timer by voice, automate your routine, or put it on the Action Button on Apple Watch Ultra • Your saved timers show up in Spotlight search BUILT FOR APPLE WATCH • Run timers standalone on your watch, or use it as a remote control for the timer on your iPhone • Record workouts to Apple Health with heart rate and calories — just pick an activity type when you start • Watch-face complications and Smart Stack support put your timers one tap away ALWAYS IN SYNC • Saved timers sync automatically across your devices with iCloud • SharePlay keeps timers perfectly in sync with friends anywhere in the world — challenge them to a workout • Share any timer as a link; anyone can open it instantly, even without the app SOUNDS THAT CUT THROUGH • Clear countdown beeps, interval cues, and finish sounds • Spoken announcements that call out each interval by name (Plus) • Extra sound packs — Airhorn, Ruan, Taiko, and more (Plus) MADE TO BE GLANCED AT • A distraction-free full-screen timer you can read from across the gym • Beautiful light and dark themes for both the app and the timer screen • Localized into 11 languages TimerNinja is free to use. TimerNinja Plus unlocks the Pomodoro and Custom timer types, spoken announcements, and extra sound packs. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.timerninja.com/privacy
Screenshots
Verdict
The clearest difference is ratings volume: Seconds Interval Timer at 24K against TimerNinja's 8. Seconds Interval Timer also leads on rating (4.7 vs 4.4) and iOS requirement (18.0 vs 26.0). TimerNinja's advantage is review sentiment (83% vs 75%) and device support (6 vs 3). On price, update cadence, 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. Seconds Interval Timer sells 1 one-off in-app purchase and TimerNinja sells 4 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
Seconds Interval Timer holds the better App Store score, 4.7 against 4.4. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 75% of Seconds Interval Timer's written reviews are positive against 83% of TimerNinja's, so the app with the better star average is not the one people write more warmly about.
Seconds Interval Timer ships an update monthly, TimerNinja every 3 weeks. The most recent releases landed on September 24, 2026 and September 8, 2026 respectively.
| Parameter | Seconds Interval Timer | TimerNinja |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (24K ratings) — better | 4.4 (8 ratings) |
| Positive reviews | 75.0% of reviews | 83.3% of reviews — better |
| Number of ratings | 24K — better | 8 |
| Update frequency | Monthly | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro — better |
| Requires iOS | 18.0 — better | 26.0 |
| Further details — not scored | ||
| Size | 95 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Runloop Ltd | Heftii, Inc. |
Customer experience
Seconds Interval Timer
TimerNinja
Bugs and requests
Seconds Interval Timer
Reported bugs
2 issues- Timer sometimes stops working unexpectedly
- Issues with restoring purchases on new devices
Requested features
5 requests- Ability to change beep/alert volume independently
- Option to delay transition between intervals
- Sync workouts across devices
- More preset workout templates
- Heart rate monitoring integration
TimerNinja
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Seconds Interval Timer
- Advanced Version$7.99
TimerNinja
- TimerNinja+ Monthly$2.991 Month
- TimerNinja+ Family Monthly$3.991 Month
- TimerNinja+ Yearly$9.991 Year
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- TimerNinja+ Family Yearly$14.991 Year
Questions
Is Seconds Interval Timer free?
Is TimerNinja free?
Which has better reviews, Seconds Interval Timer or TimerNinja?
Do Seconds Interval Timer or TimerNinja have ads?
Which is updated more often, Seconds Interval Timer or TimerNinja?
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