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

What’s New

Version 4.2.0

Bug fixes in iOS13

Ratings and Reviews

4.5 out of 5
510 Ratings

510 Ratings

imperatrix mundi ,

Great until I switched to iOS 12

I use this to walk/slow trot in intervals. I’ve used it for awhile. In July I discovered Pokémon GO. On my walking/saunter route, sometimes I stop to get in a raid. I used to be able to pause IntervalTimer Pro, fight the raid, then resume my routine. Since I upgraded to iOS 12 (from iOS 10), if I pause IntervalTimer Pro and switch to another app, my routine stops. I was used to that earlier if I had it paused for awhile (like 5 minutes or more), but today I lost my routine when it was paused and I switched apps for maybe 10 seconds, if that.
I went to Deltaworks’ website to try to contact their support rather than mention this in a review, but they don’t seem to have anything listed for support. Additionally, IntervalTimer (free or pro) is not listed on their site.
I also echo a previous reviewer’s comment about available sounds. I’m disappointed some of the sounds were removed. They remain in old routines I created, but I cannot add those same sounds to new routines. I assume that was an IP thing, and sometimes things like that can’t be helped. I miss the human voice announcing the routine is complete (she was replaced by a computer-generated voice). Again, maybe that was a residuals thing and the devs needed to cut some costs. But I miss the human.
I really miss being able to pause for a minute or three, though. If this can’t be fixed, I’ll have to figure out how to force my Fitbit app to do this, or I’ll have to get another interval app.

Szopinet ,

Perfect for me!

The 4.1.9 update resulted in sluggish responsiveness when using switching between 2 apps. I listen to NPR or watch video during parts of my exercise routine. When I switch back to interval timer it takes several seconds for the timer display to adjust to the end of the exercise. The alert sounds on time. It’s just the display that is sluggish when switching back to it. Previously the display refresh was much quicker. SEE BELOW COMMENTS. THIS REALLY IS AN AWESOME APP THAT DOES EXACTLY WHAT I NEED. I wish the company had a more private way to give performance feedback about the app.

I really like the flexibility of this app. I'm not a gym rat but wanted a way to time and measure a few exercises I do. I don't use the app the way an athlete might but rather use the low and high intensity to time the length of time doing an exercise - for me low intensity is the time exercising and high intensity is my rest time.
The paid version allows me to set up all of my exercises and allows me to easily shorten or lengthen my workout based on the amount of time I have.
I also like the graph that shows each exercise and the amount of time I spent on it. As a repetition and time counter this app is very flexible and meets my need to record and track my workout - even though my exercise is moderate by most standards.
If I could add something to this app in would be an option to show the total amount of exercise time for a particular day.

Chopper&G ,

Very customizable!!

I have used this for nearly a year doing interval run training. I love that I'm able to add multiple workouts, customize high and low intervals, breaks, and warmup/cool down. The notifications are loud enough that I'm able to hear over my music or podcast, and the sounds keep me on track for training. It's easy to pause and restart as needed and I love that I can program multiple run interval times within the same workout. I just upgraded to the full version; I'm not really sure there's any difference aside from the lack of ads at the bottom of the screen. Still, I want to support the developer and laud the work put into this app. It does everything I need and runs seamlessly in the background while I run. It saves my workouts and gives me the option to share socially. I highly recommend this over other interval apps I've tried!


Deltaworks Limited
45.5 MB

Requires iOS 9.3 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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