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The smart workout log for strength training at the gym.

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Seconds Pro - Interval Timer

Seconds is an extremely popular, and highly versatile interval timer app for High Intensity Interval Training (HIIT), Tabata and circuit training workouts.

Download Seconds for free on iOS or Android and try all it's features. A one time in-app purchase for the Seconds Pro upgrade will allow you to save your timers rather than recreating them each time.

Download Seconds Interval Timer on the App Store Download Seconds Interval Timer on Google Play

Templates for HIIT, Tabata and circuit training

Seconds comes with templates for common interval programming allowing to build advanced timers in a matter of moments.

If the templates do not fit your needs you can use the custom timer to build your timer one interval at a time. You can even combine and loop through many timers using the compound timer.

Speaks your interval names

Often when working out you just want to keep your phone in your pocket and get on with it. But if you are doing a circuit involving many intervals how do you remember what's next?

Seconds will speak your interval names, so this is never a problem. There is even an option to let you know what the next interval is so you have time to prepare before it starts.

Soothing alerts

If you are looking for a mediation or yoga timer text-to-speech or high pitch beeps may not be appropriate. For situations like these Seconds comes with more soothing alerts such as bells and gongs, or you may wish to have no alert sounds at all, or just a vibration. All these options are available.

Music the way you like it

Seconds provides plenty of options for how you listen to your music while you workout. A few options include:

  • Assign songs to intervals
  • Play a playlist throughout a set
  • No music during your breaks
  • Shuffled album throughout the entire timer

Of course, if none of those suit you, you can simply listen to your favourite music player in the background and Seconds will play it's alerts over the top.

Import and export your timers

Importing and exporting timers from Seconds Pro could not be simpler. Just select the timers you wish to share and hit Export. Timers can be sent via email or AirDrop (on iOS devices).

Timers can even be shared with friends that don't have the app via the web sharing function. Once shared, an online timer will be created for anyone to use on any device.

Runs in foreground or background.

Seconds Interval Timer will continue to alert you of interval changes whether in the background or the foreground.

Color code your intervals

Colored intervals are great when you just need a visual clue to see which interval you are on and what is coming up next. Seconds displays the the whole screen in the current intervals color, apart from the next interval which uses it's own color.

Seconds has 10 colors to choose from with an advanced option to customize the colors if you wish.

Vertical and horizontal timer display

Seconds utilises all the available width for the main timer display so it's easy to read at a glance. By default it displays the interval time remaining, but can be configured to show total time remaining, or elapsed times.

Recent Customer Reviews

Best interval timer app on iOS

Great features and flexibility to build the exercise timers you need, plus great support from the developer. Get this app!


Does it all.

Practical And Powerful

There are many reasons why I think this is the best workout logger you can find for mobile.

- Dedicated developer

- Quick and easy to set-up and use (everything makes sense)

- Great design and attention to detail

- Rest timers automatically start when you log a set

- Great charts make it easy to track your progress (Now even better)

- Data is easy to back-up and export / import

- Powerful features you can grow in to using over time to automate your routines

Keep up the great work!

Great all, exactly what i was looking for

I’ve been searching for a good workout app I could use to run my own routines with lost of customization while still being easy to use. HeavySet does pretty much everything I want. I’d love more options for the core exercises i do between weightlifting sets but it looks like the new update might even add some more possibilities there. Great app, good work!


HeavySet is honestly the best lifting app in the App Store at this point and has none of the subscription model nonsense.

Lifting log apps are so abundant and I have bought dozens of them throughout the years. It's very seldom that I find one that ticks as many boxes as HeavySet. It is obvious the developer puts a lot of thought into the app and you can sense his passion for quantifying the data behind exercise.


Version 2018.04 — this update really polished it to the point I'm left with very few gripes compared to when it first released.


I would still like to see the charts have an option for smoothed curve lines but that's such a trivial thing. It also would be nice to be able to track basic cardio (distance / time) so that I can keep track of what I did as warm up before I lift, but I also appreciate that this app is laser-focused on tracking lifting so insanely well.

Great App

Very versatile.


This little app is shockingly great. So far so good. Still setting up my work outs. But great app so far

Clean app with all you need

I like this app for a few reasons. Firsty, the UI takes some getting used to, but there was thought involved with making it an efficient experience to log your workouts. Secondly, I like the option to add new lifts and delete old ones. Finally, it's just 10 bucks to get all the features. No subscriptions, just a flat fee.

I love this app

Works great for rounds on the heavy bag. I alternate between kettlebell swings, rest, hitting the bag I like how Apple Music playlists work with it.

5 stars

Perfect easy to make customized workout timer. Great for HIIT or any workout. I love all the options and that it takes less than 30 seconds to have my timers ready to go for the whole workout. I use while listening through headphones with a podcast or music going at the same time and it works perfect. Highly recommend.

I love this app

I use this app for everything from interval running to Tabata resistance training and gym workouts. I really love this app. You can design any kind of workout that you want and make it very specific to what ever your goal is. It’s very customizable and has so many features I don’t even understand all of them. I especially love that it syncs between my iPad and my iPhone and that I can use it on my Apple Watch. I really love it and I use it regularly!

Apple Watch Fail

Can not be used with Apple Watch also tracking a workout so therefore it’s useless.
Wish I never bought premium!