Comparison

Seconds Pro Interval Timer vs Group Fit Trainer

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

Group Fit Trainer

Connect with clients seeking your specific fitness expertise, whether it's strength training, Pilates, or sports. Manage your schedule, service area, and payments seamlessly to build your own successful fitness business.

Highlights
  • Connect with niche clients
  • Set your own schedule
  • Manage service area
  • Streamlined payment system
  • Flexible booking and cancellations
  • Secure data storage
Features
Read full description

Run your entire personal training business in one place. Group Fit handles your bookings, scheduling, payments, and messaging so you can focus on coaching. Now accepting trainers across the USA and Canada. Bring your existing clients, or get discovered by new ones. Either way, the admin is on us. LESS ADMIN, MORE COACHING • Stop chasing payments: clients pay in-app, with weekly payouts • Stop the back-and-forth: customers can only book the days and times you open • No more conflicts: approve bookings, reschedule, and see your whole month in one calendar SET YOUR RATES, GET PAID WEEKLY • Set your own price per specialization • Weekly payouts, every cent itemized • Transparent commission, every transaction logged • Earnings trends by activity, customer, and time A PROFILE THAT SELLS YOU • Showcase certifications, insurance status, experience, and specializations • Add your bio and photos • Reviews from real sessions build your reputation • One link clients can use to choose you with confidence YOU CONTROL YOUR AVAILABILITY • Set the days and time ranges you're open, customers can only book within them • Define each location with a travel radius and a buffer between sessions • Offer in-home, studio, and virtual, across different cities on different days • No back-and-forth: customers pick from the times you've made available COACH BEYOND THE SESSION • Build reusable workout and nutrition plan templates • Weekly split builder: Push/Pull/Legs or custom, with sets, reps, weight ranges, and cardio • Progressive-overload suggestions bump targets in one click • Set calorie and macro targets, clients log by food search or barcode • Assign plans to any client you've trained, no roster to import • Client overview: see who's active and who needs a nudge, with per-client charts, goals, and a branded progress PDF • Log a session on a client's behalf RUN THE SESSION • See every request with activity, time, customer, and PAR-Q in one view • Customer health questionnaire (PAR-Q) linked from each request • Session details: meeting link, price, commission, and session code • Reschedule cleanly, customer notified instantly GET DISCOVERED Beyond your own clients, you're visible to customers already searching for trainers by activity and city across the USA and Canada. No marketing spend required. Get set up in 6 guided steps and go live faster than you think. Download Group Fit for Trainers and take back your time.

Screenshots

Seconds Pro Interval Timer4 screens
Group Fit Trainer4 screens

Verdict

The call

The clearest difference is price: Group Fit Trainer at Free against Seconds Pro Interval Timer's $7.99. Group Fit Trainer also leads on update cadence (every 6 days vs fortnightly) and iOS requirement (15.1 vs 18.0). Seconds Pro Interval Timer's advantage is rating (4.8 vs 4.2) and review sentiment (80% vs 50%). 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

CostPrice · In-app purchases · Ads · Monetization

Group Fit Trainer 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.

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 5, 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 50% of Group Fit Trainer's.

UpkeepUpdate frequency

Seconds Pro Interval Timer ships an update fortnightly, Group Fit Trainer every 6 days. The most recent releases landed on October 15, 2026 and October 4, 2026 respectively.

Scorecard8 real differences · 3 level
Seconds Pro Interval Timer versus Group Fit Trainer: the parameters behind the verdict, then further details
ParameterSeconds Pro Interval TimerGroup Fit Trainer
Price$7.99Free — better
Rating4.8 (12K ratings) — better4.2 (5 ratings)
Positive reviews79.7% of reviews — better50.0% of reviews
Number of ratings12K — better5
Update frequencyFortnightlyEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#9 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.015.1 — better
Further details — not scored
Size94 MB42 MB
Age rating4+4+
DeveloperRunloop LtdGroup Fit Technologies Inc

Customer experience

Seconds Pro Interval Timer

All ratings12,104 ratings
Positive94.7%
Neutral1.9%
Negative3.4%
Written reviews1,520 reviews
Positive79.7%
Neutral6.0%
Negative14.3%

Group Fit Trainer

All ratings5 ratings
Positive80.0%
Neutral0.0%
Negative20.0%
Written reviews6 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

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

Group Fit Trainer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Seconds Pro Interval Timer

No in-app purchases

None

Group Fit Trainer

No in-app purchases

Questions

Is Seconds Pro Interval Timer free?
Seconds Pro Interval Timer costs $7.99, with no in-app purchases.
Is Group Fit Trainer free?
Group Fit Trainer is free to download, with no in-app purchases.
Which has better reviews, Seconds Pro Interval Timer or Group Fit Trainer?
Seconds Pro Interval Timer is rated higher. Seconds Pro Interval Timer averages 4.8 out of 5 from 12K ratings, while Group Fit Trainer averages 4.2 from 5 ratings.
Do Seconds Pro Interval Timer or Group Fit Trainer have ads?
Neither Seconds Pro Interval Timer nor Group Fit Trainer shows ads.
Which is updated more often, Seconds Pro Interval Timer or Group Fit Trainer?
Seconds Pro Interval Timer ships an update fortnightly, and Group Fit Trainer every 6 days. Most recently, Seconds Pro Interval Timer was updated on October 15, 2026 and Group Fit Trainer on October 4, 2026.

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