BuiltByJack

Independent design & development

Useful things.
Built with care.

BuiltByJack is my independent product studio. I design and build apps with a clear purpose, starting with Rest Clock.

Explore Rest Clock
Featured appAndroid
Rest Clock’s full-screen green Strength mode, ready to time the rest between sets.
Rest ClockStrength & interval timer

Workout timer

Rest Clock

A rest timer and an interval timer,
in one app.

Rest between
sets.

Set your rest duration, then tap the screen when you finish a set. Rest Clock lets you know when it’s time to go again.

Rest Clock in landscape with a large red rest countdown reading 1 minute 19 seconds, and tap-to-pause and double-tap-to-restart guidance.
Strength mode · Rest countdownActual app screen

Control it between sets.

Full-screen gestures. Tap to pause or resume; double-tap to restart.

See it across the room.

A bold countdown that adapts to portrait and landscape.

Keep your workout moving.

Sound cues and Android notification controls keep the timer useful when you leave the app.

Android
Closed testing
iPhone
In development
Availability & support

About the studio

Behind
BuiltByJack.

I’m Jack, the designer and developer behind BuiltByJack.

I built Rest Clock because I wanted something straightforward to use in my own training. A simple timer that works in the real world, without extra fluff.

I’ve refined it through my own training and feedback from testers, paying attention to the things you notice during a workout: clear timing, quick controls and alerts that work alongside your music.

Rest Clock support

Is Rest Clock available yet?

Not publicly yet. The Android app is in closed testing, and the iPhone version is in development. I’ll add the store links here when they’re ready.

How do I get help or share feedback?

Email builtbyjack.support@gmail.com. If something isn’t working, include your phone model, app version and what happened. There’s also a User guide in the app’s Settings.

Where can I read the privacy policy?

You can read the current Android privacy policy here. It covers the closed-testing app. Updated information for the public release and iPhone version will be available before launch.

Get in touch.

Have a question about Rest Clock,
or an idea you’d like to discuss?

Email Jack