Comparison

Interval Timer vs Interval Timer by STRNTH

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

Head to head
About

Interval Timer

This app provides a customizable interval timer for running, sprints, and HIIT workouts. It offers voice and haptic cues, Apple Watch integration, and saves data to Apple Health. Choose from pre-made routines or build your own for focused training.

Highlights
  • Customizable run/walk intervals
  • Voice and haptic interval cues
  • Apple Watch control and phone-free workouts
  • Save sessions to Apple Health
  • 25+ ready-made running workouts
  • Build multi-step advanced workouts
  • Lock Screen and Dynamic Island Live Activities
Features
Read full description

Interval Run is a running interval timer for iPhone and Apple Watch. Create run/walk intervals, sprint sessions, and HIIT workouts in seconds. Train with voice announcements and haptic cues, control workouts from Apple Watch, save sessions to Apple Health, and track your workout history. Choose from 25+ ready-made running workouts or build your own. Follow intervals from the Lock Screen and Dynamic Island, and focus on your run. 25+ READY-MADE RUNNING WORKOUTS • Explore run/walk workouts, running intervals, sprints, hill repeats, tempo runs, fartlek sessions, ladders, pyramids, and more • Find workouts for speed, endurance, recovery, and different training goals • Start any workout immediately or customize it to match your training • Save your favorites to My Workouts for quick access BUILD YOUR OWN INTERVAL WORKOUT • Create simple run/walk intervals or advanced multi-step workouts • Add warm-up, running, walking, recovery, rest, and cool-down sections • Set a custom duration for every step • Repeat intervals and complete workout blocks • Add custom cues to guide you through each workout step • Build sprint, HIIT, cardio, and structured running sessions • Save multiple workouts and reuse them anytime • Preview the complete workout before you start VOICE & HAPTIC INTERVAL CUES • Hear clear voice announcements at every interval transition • Feel haptic cues when it’s time to run, walk, recover, or rest • Keep your workout active while your iPhone is locked or the app is in the background • Follow your current interval from the Lock Screen and Dynamic Island with Live Activities • Listen to music, podcasts, or audiobooks while you train RUN WITH APPLE WATCH • Sync workouts to Apple Watch • Start, pause, and control workouts directly from your wrist • Run phone-free with your workouts ready on Apple Watch • Follow interval progress without repeatedly checking your phone • Track heart rate, distance, and active energy during your workout • Get haptic interval cues directly on your Watch • Save completed workouts to Apple Health TRACK YOUR TRAINING • Browse completed workouts in calendar and history views • Review workout duration, intervals, distance, and active energy • Look back at your running and interval training over time • Share your workout results • Export and restore backups of your workout data MADE FOR RUNNERS WHO TRAIN WITH INTERVALS Whether you’re starting with beginner run/walk intervals, adding speed work to your weekly training, preparing for a 5K or another race, or creating a challenging HIIT session, Interval Run keeps every interval clear from start to finish. Use it as a simple run/walk timer, a running interval timer for speed training, an Apple Watch interval timer for phone-free workouts, or a flexible workout builder for more advanced structured sessions. From beginner run/walk workouts to sprints, tempo runs, hill repeats, fartlek training, and custom multi-step sessions, Interval Run adapts to the way you train. Start with one of 25+ ready-made workouts or create your own. Interval Run handles the timing so you can focus on your training. Some features shown, including the full workout library, advanced workout creation, multiple saved workouts, and full workout history, require Interval Run Pro. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Interval Timer by STRNTH

Features
Read full description

Interval Timer by STRNTH is a free interval timer for HIIT, Tabata, EMOM, AMRAP, boxing rounds, running intervals, stretching and more. Build any timer you want with no fixed structure, then run it hands-free and read it from across the room. BUILD ANY TIMER - Add as many steps as you like, each with its own label, duration, color, sound and voice. - Group steps into repeat blocks so a round loops as many times as you need. - Link separate timers together to chain a warm-up, workout and cool-down into one session. - Start from a template: Couch to 5K, Tabata, HIIT, 7 minute workout, EMOM, AMRAP, boxing rounds, Pomodoro, box breathing and full body stretch. RUN IT HANDS-FREE - A giant readout inside a progress ring, sized to read from across the gym. - Full-screen color per step so you know your phase at a glance. - Voice reads each step and announces what is next before it arrives. - Sound cues on the last three seconds, plus beep, go, switch, rest, bell, horn, gong and whistle tones. Import your own sounds too. - Optional spoken 3-2-1 countdown, a cadence metronome from 60 to 180 BPM and haptic feedback. - An optional get-ready countdown before you start, from 3 to 30 seconds. - Choose what the screen shows: interval time, total time, interval count, the clock or heart rate. MORE TOOLS - A countdown tab with saved presets for a fast single timer. - Workout reminders on the days and time you choose. - A stopwatch with laps that highlight your fastest and slowest split. - Workout history that logs every session so you can look back and run any timer again. - Light and dark themes and your own custom step colors. - Share a timer as a link or a file, and import timers others send you. ON THE BIG SCREEN - Show a running timer on a TV with AirPlay, Chromecast or a wired adapter. - Your phone stays the controller while the big screen stays in step. ACROSS YOUR DEVICES - An Apple Watch companion runs your timers on the wrist with color and haptics. - Pair a Bluetooth heart rate strap to see live BPM, zones and more while you train. - Save finished sessions to Apple Health as workouts. - Back up your timers to your private iCloud. FREE, WITH A ONE-TIME UPGRADE Interval Timer is free and supported by ads. One payment removes ads for good. No sign up, no accounts and no subscriptions. Your timers stay on your device. Part of the STRNTH family of training apps.

Screenshots

Interval Timer4 screens
Interval Timer by STRNTH4 screens

Verdict

The call

The clearest difference is ads: Interval Timer at none against Interval Timer by STRNTH's shown. Interval Timer by STRNTH's advantage is iOS requirement (15.1 vs 26.0). On price, update cadence, 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

Both are free to download. Interval Timer sells 3 in-app purchases, starting at $2.99 per month and Interval Timer by STRNTH sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Interval Timer ships an update fortnightly, Interval Timer by STRNTH every 3 weeks. The most recent releases landed on November 6, 2026 and November 5, 2026 respectively.

Scorecard2 real differences · 8 level
Interval Timer versus Interval Timer by STRNTH: the parameters behind the verdict, then further details
ParameterInterval TimerInterval Timer by STRNTH
PriceFreeFree
Rating4.5 (539 ratings) — better—
Positive reviews21.1% of reviews—
Number of ratings539 — better—
Update frequencyFortnightly — betterEvery 3 weeks
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Apple Watch — better
Requires iOS26.015.1 — better
Further details — not scored
Size17 MB56 MB
Age rating4+12+
DeveloperRoma SosnovskyNext Big Leap Ltd

Bugs and requests

Interval Timer

Reported bugs

4 issues
  • Timer resets or freezes during workout
  • Prompts not working when phone is locked or in pocket
  • Unexpected interval changes or duration changes
  • Compatibility issues with music playback

Requested features

6 requests
  • Option to pause/resume timer
  • Larger time remaining display
  • Apple Watch app
  • Ability to play audio prompts even with screen off
  • More interval options (run/walk/jog)
Show 1 more
  • Congratulatory audio cue at the end

Interval Timer by STRNTH

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

Interval Timer

Subscriptions2
  • Interval Run Pro Monthly$2.991 Month
  • Interval Run Pro Annual7 Days trial$19.991 Year
One-time1
  • Full Version$2.99
1 purchases

Interval Timer by STRNTH

One-time1
  • Remove ads$9.99

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is Interval Timer by STRNTH free?
Interval Timer by STRNTH is free to download, with in-app purchases available.
Do Interval Timer or Interval Timer by STRNTH have ads?
Interval Timer by STRNTH shows ads; Interval Timer does not.
Which is updated more often, Interval Timer or Interval Timer by STRNTH?
Interval Timer ships an update fortnightly, and Interval Timer by STRNTH every 3 weeks. Most recently, Interval Timer was updated on November 6, 2026 and Interval Timer by STRNTH on November 5, 2026.

Other comparisons