Comparison

Seconds Interval Timer vs RockFit

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

RockFit

Features
Read full description

With the RockFit App, you will have access to workout programs designed specifically to help you reach your fitness and health goals! You can follow & track your workouts, your nutrition, your lifestyle habits, measurements and results–all with the help of your coach. FEATURES: - Access training plans and track workouts - Follow along to exercise and workout videos - Track your meals and make better food choices - Stay on top of your daily habits - Set health and fitness goals and track progress towards your goals - Gain milestone badges for achieving new personal bests and maintaining habit streaks - Message us in real-time - Track body measurements and take progress photos - Get push notification reminders for scheduled workouts and activities - Connect your Apple Watch to track workouts, steps, habits, and more right from your wrist - Connect to other wearable devices and apps like the Apple Health App, Garmin, Fitbit, MyFitnessPal, and Withings devices to track workouts, sleep, nutrition, and body stats and composition Download the app today!

Screenshots

Seconds Interval Timer4 screens
RockFit4 screens

Verdict

The call

The clearest difference is in-app purchases: RockFit at none against Seconds Interval Timer's 1. RockFit also leads on iOS requirement (15.5 vs 18.0). On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Seconds Interval Timer sells 1 one-off in-app purchase. RockFit asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 8 level
Seconds Interval Timer versus RockFit: the parameters behind the verdict, then further details
ParameterSeconds Interval TimerRockFit
PriceFreeFree
Rating4.7 (24K ratings) — better—
Positive reviews74.5% of reviews—
Number of ratings24K — better—
Update frequencyMonthlyMonthly
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS18.015.5 — better
Further details — not scored
Size99 MB171 MB
Age rating4+4+
DeveloperRunloop LtdRockFit LLC

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

RockFit

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
None

RockFit

No in-app purchases

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is RockFit free?
RockFit is free to download, with no in-app purchases.
Do Seconds Interval Timer or RockFit have ads?
Neither Seconds Interval Timer nor RockFit shows ads.
Which is updated more often, Seconds Interval Timer or RockFit?
Seconds Interval Timer ships an update monthly, and RockFit monthly. Most recently, Seconds Interval Timer was updated on October 26, 2026 and RockFit on October 24, 2026.

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