Comparison

Interval Timer Pro vs GymNext Flex Timer

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

Head to head
About

Interval Timer Pro

This app helps you manage work and rest periods for various fitness activities. It offers customizable intervals, runs in the background, and allows you to play music during workouts. Save your settings and share your progress.

Highlights
  • Customizable sets and intervals
  • Background operation
  • Music playback
  • Save settings as templates
  • Post-workout sharing
Features
Read full description

We’re proud to introduce this handy little app that helps you keep track of your work and rest periods during workouts. Whether your into cycling, running, lifting weights, exercise, workout, stretching, boxing, MMA or HIT, this interval timer will prove to be an invaluable asset to you. Running foreground, background or with device locked, this reliable app allows you specify an overall time as well as program High/Low intensity interval and rest time between sets. Key Features: - Customizable sets, high/low intensity interval and rest for your own need - Retina display, iOS4 and multitasking - Continue to run even when screen is locked - Play your song or playlist during your workout - Post your workout to Facebook or Twitter - Save settings as templates Customizable Features: - Number of Sets - Countdown Time - Set Time - Low Interval time - High Interval time - Rest Time - First Interval (low or high) - Sound Volume - Timer Sounds - Auto Lock - Vibrate - Pause during Rest - Playlist - New Each Set

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

Screenshots

Interval Timer Pro4 screens
GymNext Flex Timer4 screens

Verdict

The call

The clearest difference is price: GymNext Flex Timer at Free against Interval Timer Pro's $2.99. GymNext Flex Timer also leads on update cadence (every 3 weeks vs every 3 months) and rating (4.8 vs 4.5). Interval Timer Pro's advantage is in-app purchases (none vs 2) and chart position (#90 vs unranked). On review sentiment, ads, monetization model 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

GymNext Flex Timer is free to download; Interval Timer Pro costs $2.99 up front. GymNext Flex Timer sells 2 in-app purchases, starting at $8.99 per month. Interval Timer Pro asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

GymNext Flex Timer holds the better App Store score, 4.8 against 4.5. Both are backed by a comparable volume of ratings — 598 and 2.1K respectively. Written reviews complicate that: 75% of Interval Timer Pro's written reviews are positive against 72% of GymNext Flex Timer's, so the app with the better star average is not the one people write more warmly about.

UpkeepUpdate frequency

Interval Timer Pro ships an update every 3 months, GymNext Flex Timer every 3 weeks. The most recent releases landed on September 27, 2026 and September 25, 2026 respectively.

Scorecard6 real differences · 5 level
Interval Timer Pro versus GymNext Flex Timer: the parameters behind the verdict, then further details
ParameterInterval Timer ProGymNext Flex Timer
Price$2.99Free — better
Rating4.5 (598 ratings)4.8 (2.1K ratings) — better
Positive reviews75.2% of reviews — better72.4% of reviews
Number of ratings5982.1K — better
Update frequencyEvery 3 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
Best chart rank#90 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Apple Watch — better
Requires iOS15.015.0
Further details — not scored
Size25 MB185 MB
Age rating4+4+
DeveloperBeesoft AppsHomick Enterprises

Customer experience

Interval Timer Pro

All ratings598 ratings
Positive88.0%
Neutral4.0%
Negative8.0%
Written reviews492 reviews
Positive75.2%
Neutral7.7%
Negative17.1%

GymNext Flex Timer

All ratings2,119 ratings
Positive96.6%
Neutral1.1%
Negative2.4%
Written reviews170 reviews
Positive72.4%
Neutral5.9%
Negative21.8%

User reviews

Interval Timer Pro

From 598 App Store ratings

What we love

  • 💪 Excellent for interval training
  • 🎨 Customizable workouts
  • 🎶 Integrates with music
  • ⏱️ Reliable timer
  • 📊 Tracks workout history

Room to improve

  • 🐛 Bugs with screen orientation and audio
  • 🔄 No ability to reorder intervals
  • 📤 No workout sharing or syncing
  • 🔒 Lack of customization options
  • 💰 Paid version offers limited additional features

GymNext Flex Timer

From 2.1K App Store ratings

What we love

  • 🚀 Versatile and customizable
  • 👍 User-friendly interface
  • 🔔 Reliable and consistent
  • 💪 Excellent for interval training
  • 🔊 Clear audio cues

Room to improve

  • 🐛 Audio cues sometimes stop working
  • 🔊 Lack of volume control
  • 🔍 Detailed instructions needed for beginners
  • ⏱️ Delayed countdown between phone and timer

Bugs and requests

Interval Timer Pro

Reported bugs

3 issues
  • App freezes when adjusting number of sets
  • Timer stops working when switching apps
  • Paid version doesn't import free version workouts

Requested features

5 requests
  • Apple Watch integration
  • Countdown timer before interval ends
  • Ability to import/export workout routines
  • More sound effect options
  • Ability to see upcoming interval

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

In-app purchases

None

Interval Timer Pro

No 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

Questions

Is Interval Timer Pro free?
Interval Timer Pro costs $2.99, with no in-app purchases.
Is GymNext Flex Timer free?
GymNext Flex Timer is free to download, with in-app purchases available.
Which has better reviews, Interval Timer Pro or GymNext Flex Timer?
GymNext Flex Timer is rated higher. Interval Timer Pro averages 4.5 out of 5 from 598 ratings, while GymNext Flex Timer averages 4.8 from 2.1K ratings.
Do Interval Timer Pro or GymNext Flex Timer have ads?
Neither Interval Timer Pro nor GymNext Flex Timer shows ads.
Which is updated more often, Interval Timer Pro or GymNext Flex Timer?
Interval Timer Pro ships an update every 3 months, and GymNext Flex Timer every 3 weeks. Most recently, Interval Timer Pro was updated on September 27, 2026 and GymNext Flex Timer on September 25, 2026.

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