Seconds Pro Interval Timer vs Klasik Fit, LLC
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.
Klasik Fit, LLC
Track workouts, meals, and body measurements with your personal trainer. Set goals, monitor progress, and stay motivated with real-time messaging and reminders. Connects with wearable devices for seamless data syncing.
- Workout and meal tracking
- Progress monitoring
- Goal setting
- Real-time coach messaging
- Body measurement tracking
- Wearable device integration
- Workout reminders
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With the Klasik Fit App, you can start tracking your workouts and meals, measuring results, and achieving your fitness goals, all with the help of your personal trainer. - Access training plans and track workouts - Schedule workouts and stay committed by beating your personal bests - Track progress towards your goals - Manage your nutrition intake as prescribed by your coach - Set health and fitness goals - Message your coach in real-time - Track body measurements and take progress photos - Get push notification reminders for scheduled workouts and activities - Connect to wearable devices like Apple Watch (synced to Health app), Fitbit and Withings to sync body stats instantly Download the app today!
Screenshots
Verdict
Seconds Pro Interval Timer and Klasik Fit, LLC both sit at 4.8 stars, but that hides the real split: 80% of Seconds Pro Interval Timer's written reviews are positive against 33% of Klasik Fit, LLC's. Seconds Pro Interval Timer also leads on ratings volume (12K vs 27) and update cadence (fortnightly vs every 6 weeks). Klasik Fit, LLC's advantage is price (Free vs $7.99) and iOS requirement (15.5 vs 18.0). On rating, 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
Klasik Fit, LLC 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.
On the App Store both sit at effectively the same score — 4.8 for Seconds Pro Interval Timer against 4.6 for Klasik Fit, LLC. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 27, so its average is the more settled of the two. Written reviews are what separate them: 80% of Seconds Pro Interval Timer's written reviews are positive against 33% of Klasik Fit, LLC's.
Seconds Pro Interval Timer ships an update fortnightly, Klasik Fit, LLC every 6 weeks. The most recent releases landed on October 26, 2026 and October 25, 2026 respectively.
| Parameter | Seconds Pro Interval Timer | Klasik Fit, LLC |
|---|---|---|
| Price | $7.99 | Free — better |
| Rating | 4.8 (12K ratings) — better | 4.6 (27 ratings) |
| Positive reviews | 79.5% of reviews — better | 33.3% of reviews |
| Number of ratings | 12K — better | 27 |
| Update frequency | Fortnightly — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #10 — better | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 18.0 | 15.5 — better |
| Further details — not scored | ||
| Size | 98 MB | 181 MB |
| Age rating | 4+ | 4+ |
| Developer | Runloop Ltd | Klasik Fit, LLC |
Customer experience
Seconds Pro Interval Timer
Klasik Fit, LLC
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
Klasik Fit, LLC
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Seconds Pro Interval Timer
No in-app purchases
Klasik Fit, LLC
No in-app purchases
Questions
Is Seconds Pro Interval Timer free?
Is Klasik Fit, LLC free?
Which has better reviews, Seconds Pro Interval Timer or Klasik Fit, LLC?
Do Seconds Pro Interval Timer or Klasik Fit, LLC have ads?
Which is updated more often, Seconds Pro Interval Timer or Klasik Fit, LLC?
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