Seconds Pro is the category leader and a very good interval timer, with a deeper builder, an Apple Watch app and own-music support. ClockKeepers costs the same and is not trying to beat it on depth. It does one thing Seconds does not list: your phone runs the timer and any browser TV shows it live.
A good fit if you want the deepest personal interval builder, a standalone Apple Watch app, your own music per interval with ducking, Apple Health and heart-rate estimates, and you do not need a shared screen. It is $7.99 once.
A good fit if the clock needs to be on a TV or on every phone in the room, you want to start from a preset in two taps, and you also want a free tier you can keep. It has no Apple Watch app and no own-music mode.
| ClockKeepers | Seconds Pro | |
|---|---|---|
| Price model | Free tier, then ClockKeepers Pro at $7.99 once | $7.99 once, per its US listing. A tracker showed a higher figure in the Australian store |
| Subscription or ads | None | None |
| Live shared display | Yes: link, QR or 5-letter code to any phone, tablet or TV browser. Free for 5 viewers, unlimited with Pro | None listed |
| TV without cast hardware | Yes, any browser. AirPlay and HDMI also work | None listed |
| Interval builder depth | Custom editor: 12 segments, 99 rounds, prep time | Deeper: chained compound timers, folders and more. It is ahead here |
| Apple Watch | Not available | Standalone Apple Watch app. It is ahead here |
| Music | Mixes with other apps; no own-music-per-interval mode | Own music per interval with ducking. It is ahead here |
| Apple Health | Not yet | Yes, plus a calorie estimate with a heart-rate strap |
| Ratings | Newer app, fewer ratings | 4.8 from about 12K ratings on its listing. It is ahead on trust |
| Multi-timer board | Up to 8 timers on one screen (Pro) | Chains timers in sequence; not the same as a board |
| Platforms | iPhone, iPad, any web browser, Android sideload | iPhone and iPad, plus a separate web site for publishing timers |
Last checked October 20, 2026. Seconds Pro details are from its App Store listing and third-party trackers in October 2026. Its companion web site, intervaltimer.com, rate-limited our check, so we have not verified whether it offers live sharing; its listing does not mention it. Prices vary by region and change; check each store for the current figures. A feature we mark as not listed may still exist. ClockKeepers details are from our own listing.
Both are $7.99 once with no subscription, so price is not the deciding factor. Seconds Pro includes its Apple Watch app and music features in that price. ClockKeepers gives you a free tier first (one timer, three saved presets, five viewers) and the live shared display in every tier.
For one job, yes: running intervals. If you want a deeper builder, an Apple Watch app or your own music, Seconds Pro is stronger. If you want the clock on a TV or on every phone in the room, ClockKeepers does that and Seconds does not list it.
Yes. ClockKeepers Pro is $7.99 once; Seconds Pro is $7.99 once on its US listing. Neither is a subscription.
Its listing does not mention TV output or sharing. You could screen-mirror a phone with your own hardware; we have not tested it.
One timer and five viewers free, no account, no ads. ClockKeepers Pro is $7.99 once.
ClockKeepers