Seconds Pro Interval Timer vs SYNC GO
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Seconds Pro Interval Timer
This interval timer app is designed for high-intensity interval training (HIIT), Tabata, and circuit training workouts. It features a large, color-coded display, customizable interval names, and background operation. It also integrates with Apple Health to track your fitness data.
- Full screen colored display
- Templates for HIIT, Tabata, Circuit Training
- Speaks interval names and provides warnings
- Assign music per interval
- Runs in background
- Share interval timers
- Apple Health integration
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Seconds Pro 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 Pro 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 Pro reads your body measurements and year of birth from Health to estimate calories burned. PAID ONCE, NOTHING TO UNLOCK - Seconds Pro is paid for up front. Every feature is included and every timer you make can be run as many times as you like. SECONDS AND SECONDS PRO - Seconds is the free version of this app. It has the same features, but each timer locks after one run until a single in-app purchase unlocks it. 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.
SYNC GO
This app is an all-in-one tool for creating music playlists for fitness classes. It allows instructors to access monthly music and video content, trim songs, and make playlists available offline. It also provides access to teaching aids and syncs content from a previous platform.
- Music playlist creation
- Trim songs to custom lengths
- Offline playlist access
- Access to monthly music/video content
- Syncs with SYNC Now
- Access to teaching aids
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Developed exclusively for Strong Nation's instructor network, SYNC Go is an all-in-one tool for music playlist creation. The app allows members to access their monthly music and video content provided to them by Strong Nation. Members can create a tailored playlist for their Strong Nation class. SYNC Go features trimming songs to any length to fit your class needs. Playlists can be made available offline when wifi and data are not accessible in class. Members can also easily access videos and the latest Strong Nation provided teaching aids. The app is only available to current licensed, premium Strong Nation Instructors who are members of the 'SYNC' program. Initial sign in is required to verify membership status. Your favorite content from SYNC Now automatically syncs with SYNC Go without missing a beat. The best part? You can access your playlists in class without needing Wi-Fi or mobile data. This app is for Premium SYNC Members only.
Screenshots
Verdict
The clearest difference is price: SYNC GO at Free against Seconds Pro Interval Timer's $7.99. SYNC GO also leads on iOS requirement (14.0 vs 18.0). Seconds Pro Interval Timer's advantage is update cadence (fortnightly vs every 4 months) and rating (4.8 vs 4.4). On ads, in-app purchases 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
SYNC GO is free to download; Seconds Pro Interval Timer costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Seconds Pro Interval Timer holds the better App Store score, 4.8 against 4.4. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 39, so its average is the more settled of the two. Written reviews point the same way: 80% of Seconds Pro Interval Timer's written reviews are positive against 67% of SYNC GO's.
Seconds Pro Interval Timer ships an update fortnightly, SYNC GO every 4 months. The most recent releases landed on September 24, 2026 and August 16, 2026 respectively.
| Parameter | Seconds Pro Interval Timer | SYNC GO |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 4.8 (12K ratings) — better | 4.4 (39 ratings) |
| Positive reviews | 79.9% of reviews — better | 66.7% of reviews |
| Number of ratings | 12K — better | 39 |
| Update frequency | Fortnightly — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #8 — better | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 18.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 94 MB | 51 MB |
| Age rating | 4+ | 4+ |
| Developer | Runloop Ltd | Zumba® Fitness |
Customer experience
Seconds Pro Interval Timer
SYNC GO
Bugs and requests
Seconds Pro Interval Timer
Reported bugs
4 issues- Intervals randomly pausing or skipping
- Music volume issues when launching the app
- Inconsistent audio cues and countdown
- Sync issues between devices
Requested features
6 requests- Ability to lock Apple Watch screen
- Option to see more than just the next exercise
- Fractional time settings (e.g. 7.74 seconds)
- More voice/audio customization options
- Improved sync between iPhone and iPad
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- Calendar integration to track workouts
SYNC GO
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Seconds Pro Interval Timer
No in-app purchases
SYNC GO
No in-app purchases
Questions
Is Seconds Pro Interval Timer free?
Is SYNC GO free?
Which has better reviews, Seconds Pro Interval Timer or SYNC GO?
Do Seconds Pro Interval Timer or SYNC GO have ads?
Which is updated more often, Seconds Pro Interval Timer or SYNC GO?
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