Comparison

Seconds Interval Timer vs Group Fitness Class Timer

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 interval timer app helps you build and run custom workouts for HIIT, Tabata, and circuits. It provides voice cues, runs in the background, and syncs with Apple Watch. Save workouts to Apple Health and track calories burned.

Highlights
  • Build custom timers for any workout
  • Voice cues for intervals
  • Runs in background with screen off
  • Syncs with Apple Watch
  • Color-coded interval display
  • Save workouts to Apple Health
  • Play music with cues
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

Group Fitness Class Timer

This app helps group fitness instructors plan and time their classes. It offers a library of exercises, customizable class structures, and on-wrist controls for seamless teaching. Plan, rehearse, and lead your sessions with integrated music and workout tracking.

Highlights
  • Class planning and interval timing
  • 900+ exercise library
  • Customizable class structures
  • Apple Watch integration
  • Music pairing with auto-ducking
  • Offline class support
Features
Read full description

More than a timer. Group Fit Studio is the all-in-one class planner and interval timer built for group fitness instructors. Design how your class flows, fill it with moves from a catalog of 900+ exercises, then press play to teach with your plan and timer working together. Whether you teach HIIT, Tabata, circuits, bootcamp, strength, yoga, Pilates, or barre, Group Fit Studio adapts to your format. Plan, timer, and music live in one app, and the class you build is exactly what the timer runs. GET STARTED IN MINUTES Pick a ready-made starter class and make it yours, or start from a blank page. Rehearse it as a live session before you teach it for real. ONE CLASS, ONE PLACE Each class gets one workspace: timed blocks, group intervals, and station rotations, plus warm-up and cool-down. Set the structure once, then refresh the moves week after week. PRESS PLAY Tap Start and the timer runs your class: work and rest countdowns, auto-advance, and skip forward or back on the fly. Pair an Apple Music playlist and it ducks under the countdown beeps. WEAR IT ON YOUR WRIST Your Apple Watch mirrors the live session, controls it from your wrist, and records the class as a workout in Health. FIND THE RIGHT MOVE 900+ exercises with step-by-step instructions and muscle targeting. Create your own and use them right away, or submit them to the shared catalog. MIX & MATCH WITH COMBOS Studio Combos put several exercises in one slot. Use the community's or build your own. BUILT FOR INSTRUCTORS - Ready-made starter classes to get you teaching in minutes - One workspace per class — structure and this week's exercises side by side - Studio Combos — pre-built or custom exercise groups for any slot - Timed, group, and station-based blocks — HIIT, Tabata, circuits, rounds, and more - Timed blocks with a sequence of moves — each gets its share of the clock, and the live timer calls out what's next - Suggested resistance for every move: Light, Medium, or Heavy, plus what to use, like 15 lb dumbbells or 2 white springs - Live session timer with work/rest countdowns, auto-advance, and interval navigation - Apple Watch companion with on-wrist session controls - Apple Music playlist pairing with auto-ducking countdown beeps - 900+ exercises with muscle and equipment filters - Create your own exercises and use them immediately in your classes - Offline support — your classes and sessions work without a connection - Session history to track what you taught and when Designed by a group fitness instructor with 19 years of teaching. Group Fit Studio is free to try. A subscription unlocks unlimited classes. --- Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Seconds Interval Timer4 screens
Group Fitness Class Timer4 screens

Verdict

The call

The clearest difference is update cadence: Group Fitness Class Timer at every 2 days against Seconds Interval Timer's monthly. Group Fitness Class Timer also leads on rating (5.0 vs 4.7). Seconds Interval Timer's advantage is ratings volume (24K vs 2) and iOS requirement (18.0 vs 26.0). On price, 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

Both are free to download. Seconds Interval Timer sells 1 one-off in-app purchase and Group Fitness Class Timer sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Group Fitness Class Timer holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

Seconds Interval Timer ships an update monthly, Group Fitness Class Timer every 2 days. The most recent releases landed on November 5, 2026 and October 31, 2026 respectively.

Scorecard4 real differences · 6 level
Seconds Interval Timer versus Group Fitness Class Timer: the parameters behind the verdict, then further details
ParameterSeconds Interval TimerGroup Fitness Class Timer
PriceFreeFree
Rating4.7 (24K ratings)5.0 (2 ratings) — better
Positive reviews74.5% of reviews—
Number of ratings24K — better2
Update frequencyMonthlyEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Apple WatchiPhone, iPad, Apple Watch
Requires iOS18.0 — better26.0
Further details — not scored
Size99 MB40 MB
Age rating4+4+
DeveloperRunloop LtdPaul Krause

Customer experience

Seconds Interval Timer

All ratings23,780 ratings
Positive92.9%
Neutral1.9%
Negative5.2%
Written reviews1,289 reviews
Positive74.5%
Neutral6.4%
Negative19.1%

Group Fitness Class Timer

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

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

Group Fitness Class Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
2 purchases

Group Fitness Class Timer

Subscriptions2
  • Group Fit Studio Monthly$4.991 Month
  • Group Fit Studio Yearly$29.991 Year

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is Group Fitness Class Timer free?
Group Fitness Class Timer is free to download, with in-app purchases available.
Which has better reviews, Seconds Interval Timer or Group Fitness Class Timer?
Group Fitness Class Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while Group Fitness Class Timer averages 5.0 from 2 ratings.
Do Seconds Interval Timer or Group Fitness Class Timer have ads?
Neither Seconds Interval Timer nor Group Fitness Class Timer shows ads.
Which is updated more often, Seconds Interval Timer or Group Fitness Class Timer?
Seconds Interval Timer ships an update monthly, and Group Fitness Class Timer every 2 days. Most recently, Seconds Interval Timer was updated on November 5, 2026 and Group Fitness Class Timer on October 31, 2026.

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