Comparison

Seconds Pro Interval Timer vs HIIT (Watch) Timer

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

HIIT (Watch) Timer

This app offers a straightforward interval timer designed for Apple Watch, iPhone, and iPad. It features a clean interface, live heart rate monitoring, haptic feedback, and detailed workout summaries, seamlessly integrating with the Health app.

Highlights
  • Apple Watch independent app
  • Live heart rate monitoring
  • Haptic feedback and audio alerts
  • Workout summary with calories and heart rate
  • Health app integration
  • Customizable intervals (warm-up, cooldown, rest)
  • Complications for quick access
Features
Read full description

A simple HIIT app specifically engineered for Apple Watch. It also provides a simple HIIT timer for iPhone/iPad. With easy setup, clean display, live heart rate, haptic feedback, workout summary and completely independent Apple Watch app experience, your interval workouts will undoubtedly be fun. The workout also adds up to the move and exercise rings on Apple Watch. Features: • Super easy setup Digital crown makes setting intervals a breeze. The app remembers your previous settings. • Clean display Large fonts, vivid colors, live heart rate • Workout summary Calories burned, average and max heart rate, total time • Health app integration Workouts are saved to the Health app • Audio alerts and haptic feedback Subtle haptic feedback guiding you through the intervals. You can also set audio beep alerts if you want. • Runs in background A completely independent Apple Watch app experience • Complications They show the time left for the workout. Also, they are a quick way to launch the app. • More settings + Warm up interval + Cooldown interval + Last rest interval + Halfway alert + 8 sec warning during rest + Interval change warning (when 5 seconds are remaining) • Extra A simple HIIT timer for iPhone/iPad * Note: Though this app is primarily designed for Apple Watch, it also provides a simple iPhone/iPad HIIT timer.

Screenshots

Seconds Pro Interval Timer4 screens
HIIT (Watch) Timer3 screens

Verdict

The call

The clearest difference is rating: Seconds Pro Interval Timer at 4.8 against HIIT (Watch) Timer's 4.2. Seconds Pro Interval Timer also leads on ratings volume (12K vs 12) and update cadence (fortnightly vs every 2 months). HIIT (Watch) Timer's advantage is price ($3.99 vs $7.99) and iOS requirement (16.0 vs 18.0). On review sentiment, ads, in-app purchases and monetization model 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

CostPrice · In-app purchases · Ads · Monetization

Seconds Pro Interval Timer costs $7.99 and HIIT (Watch) Timer $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Seconds Pro Interval Timer holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: Seconds Pro Interval Timer has 12K ratings behind it against 12, so its average is the more settled of the two. Written reviews split almost evenly too, at 80% and 80% positive.

UpkeepUpdate frequency

Seconds Pro Interval Timer ships an update fortnightly, HIIT (Watch) Timer every 2 months. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

Scorecard6 real differences · 5 level
Seconds Pro Interval Timer versus HIIT (Watch) Timer: the parameters behind the verdict, then further details
ParameterSeconds Pro Interval TimerHIIT (Watch) Timer
Price$7.99$3.99 — better
Rating4.8 (12K ratings) — better4.2 (12 ratings)
Positive reviews79.9% of reviews80.0% of reviews — better
Number of ratings12K — better12
Update frequencyFortnightly — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidPaid
Best chart rank#10 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS18.016.0 — better
Further details — not scored
Size94 MB44 MB
Age rating4+4+
DeveloperRunloop LtdRhythmicWorks

Customer experience

Seconds Pro Interval Timer

All ratings12,056 ratings
Positive94.7%
Neutral1.9%
Negative3.4%
Written reviews1,499 reviews
Positive79.9%
Neutral6.0%
Negative14.1%

HIIT (Watch) Timer

All ratings12 ratings
Positive83.3%
Neutral8.3%
Negative8.3%
Written reviews10 reviews
Positive80.0%
Neutral10.0%
Negative10.0%

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
Show 1 more
  • Calendar integration to track workouts

HIIT (Watch) Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Seconds Pro Interval Timer

No in-app purchases

None

HIIT (Watch) Timer

No in-app purchases

Questions

Is Seconds Pro Interval Timer free?
Seconds Pro Interval Timer costs $7.99, with no in-app purchases.
Is HIIT (Watch) Timer free?
HIIT (Watch) Timer costs $3.99, with no in-app purchases.
Which has better reviews, Seconds Pro Interval Timer or HIIT (Watch) Timer?
Seconds Pro Interval Timer is rated higher. Seconds Pro Interval Timer averages 4.8 out of 5 from 12K ratings, while HIIT (Watch) Timer averages 4.2 from 12 ratings.
Do Seconds Pro Interval Timer or HIIT (Watch) Timer have ads?
Neither Seconds Pro Interval Timer nor HIIT (Watch) Timer shows ads.
Which is updated more often, Seconds Pro Interval Timer or HIIT (Watch) Timer?
Seconds Pro Interval Timer ships an update fortnightly, and HIIT (Watch) Timer every 2 months. Most recently, Seconds Pro Interval Timer was updated on September 24, 2026 and HIIT (Watch) Timer on September 21, 2026.

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