Comparison

GymNext Flex Timer vs HIITLY

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

Head to head
About

GymNext Flex Timer

This app offers advanced interval training timing with customizable modes and the ability to control an external LED display. It integrates with wearables and heart rate monitors for a comprehensive workout experience.

Highlights
  • Control external LED displays
  • Multiple customizable timer modes (Tabata, EMOM, etc.)
  • Save and recall favorite workouts
  • Apple Watch control
  • Audio sync with music
  • Heart rate monitor integration
  • Control multiple LED displays
Features
Read full description

Meet the future of interval training. GymNext Flex Timer is the only timer app that combines powerful workout programming with control of large, wall-mounted LED displays—giving you the best of both worlds. Traditional gym timers rely on clunky remotes and are difficult to use. Mobile apps are flexible, but hard to see across the room. Flex Timer solves both. Build and control your workouts from your phone while displaying them on bright, easy-to-read LED screens anywhere in your gym. Perfect for HIIT, CrossFit, circuits, bootcamps, boxing, MMA, strength training, and more. Features: • Use the app on its own or connect to GymNext LED displays for maximum visibility • Core timer modes include Count Up/Down, Round, Tabata, EMOM, Mixed Intervals, and Sets with Rest • Plan your personal workouts or full classes in advance—everything ready in one tap • Share timers with athletes and trainers instantly using simple links • Save workouts to your library for quick access • Control your timer from Apple Watch—completely hands-free • Smart audio sync keeps your music and timer cues perfectly aligned • Connect multiple Bluetooth heart rate monitors and track performance in real time • Set custom heart rate zones for better training feedback • Control multiple timers across your gym at the same time • Run different workouts simultaneously for group training • Reliable Bluetooth control with no line-of-sight limitations “This will eventually become the standard for all gyms” – Garage Gym Reviews “All our coaches love the clock” – CrossFit Barrie “We love it to death” – Wolverine Strength & Conditioning Download Flex Timer and upgrade the way you train. We’re always improving. Have feedback? Reach us at support@gymnext.com

About

HIITLY

This interval timer app allows for quick setup of custom workouts with adjustable intervals, rest periods, and rounds. It offers voice cues or beeps, background functionality, and detailed workout history to track progress. Ideal for HIIT, Tabata, and circuit training.

Highlights
  • Customizable intervals, rest, and rounds
  • Voice cues or beeps
  • Background functionality
  • Detailed workout history and stats
  • Repeat past workouts
  • Unlimited custom timer creation
Features
Read full description

A simple and beautiful interval timer built for your workouts. Set it up in seconds: Just drag to customize your intervals workout, rest, rounds, and more. Tap to start. That’s it. Your music stays in control: ∙ Continue using your favorite music apps during workouts. ∙ Choose between voice cues or beeps for each interval. ∙ Multitask freely — audio guides keep you on track even when you switch apps or follow an online workout. No more manual tracking: ∙ Access detailed history and stats to monitor your progress. ∙ Instantly repeat past workouts without setting them up again. Perfect for HIIT, Tabata, Stretch and circuit training. The app is designed for high-intensity interval training with features made for serious results: Display rounds, cycles, and durations clearly. Built-in interval stopwatch. Fully functional in the background. Create and save unlimited custom timers. Voice guidance to keep you focused. Got ideas to make the app better? Tap “Contact Support” in the app and share them with us — we’re always working to improve our Interval Timer!

Screenshots

GymNext Flex Timer4 screens
HIITLY4 screens

Verdict

The call

The clearest difference is in-app purchases: HIITLY at none against GymNext Flex Timer's 2. HIITLY also leads on update cadence (every 6 days vs every 3 weeks) and rating (5.0 vs 4.8). GymNext Flex Timer's advantage is ratings volume (2.1K vs 2) and device support (4 vs 2). On price, ads, monetization model and iOS requirement 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. GymNext Flex Timer sells 2 in-app purchases, starting at $8.99 per month. HIITLY asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

HIITLY holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: GymNext Flex Timer has 2.1K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

GymNext Flex Timer ships an update every 3 weeks, HIITLY every 6 days. The most recent releases landed on October 13, 2026 and September 24, 2026 respectively.

Scorecard5 real differences · 5 level
GymNext Flex Timer versus HIITLY: the parameters behind the verdict, then further details
ParameterGymNext Flex TimerHIITLY
PriceFreeFree
Rating4.8 (2.1K ratings)5.0 (2 ratings) — better
Positive reviews71.7% of reviews—
Number of ratings2.1K — better2
Update frequencyEvery 3 weeksEvery 6 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreeFree
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS15.0 — better15.1
Further details — not scored
Size185 MB27 MB
Age rating4+4+
DeveloperHomick EnterprisesMatys Bouziane

Customer experience

GymNext Flex Timer

All ratings2,119 ratings
Positive96.6%
Neutral1.1%
Negative2.4%
Written reviews173 reviews
Positive71.7%
Neutral6.4%
Negative22.0%

HIITLY

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

Bugs and requests

GymNext Flex Timer

Reported bugs

2 issues
  • Saved timers not consistently loading
  • Segmented timers not saving properly

Requested features

4 requests
  • Watch app integration for remote control
  • Background audio playback when app is closed
  • Customizable voice options
  • Lap timer functionality

HIITLY

Not enough reviews yet to summarise bugs or requests.

In-app purchases

2 purchases

GymNext Flex Timer

Subscriptions2
  • Flex Timer Pro Monthly7 Days trial$8.991 Month
  • Flex Timer Pro Yearly1 Month trial$79.991 Year
None

HIITLY

No in-app purchases

Questions

Is GymNext Flex Timer free?
GymNext Flex Timer is free to download, with in-app purchases available.
Is HIITLY free?
HIITLY is free to download, with no in-app purchases.
Which has better reviews, GymNext Flex Timer or HIITLY?
HIITLY is rated higher. GymNext Flex Timer averages 4.8 out of 5 from 2.1K ratings, while HIITLY averages 5.0 from 2 ratings.
Do GymNext Flex Timer or HIITLY have ads?
Neither GymNext Flex Timer nor HIITLY shows ads.
Which is updated more often, GymNext Flex Timer or HIITLY?
GymNext Flex Timer ships an update every 3 weeks, and HIITLY every 6 days. Most recently, GymNext Flex Timer was updated on October 13, 2026 and HIITLY on September 24, 2026.

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