Comparison

Seconds Interval Timer vs Next Up

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

Head to head
About

Seconds Interval Timer

This app provides a versatile interval timer for various workout types like Tabata, HIIT, and circuit training. It features a clear, full-screen display, customizable alerts, and background operation. Users can also utilize a stopwatch and countdown timer, with integration for Apple Health.

Highlights
  • Full-screen colored display
  • Templates for HIIT, Tabata, Circuit Training
  • Voice and audio alerts
  • Music assignment per interval
  • Background operation
  • Apple Health integration
  • Stopwatch and countdown timer
Features
Read full description

Seconds is an interval timer for HIIT, Tabata, EMOM, circuits and any workout built from timed intervals. It calls each interval out loud, keeps running with the screen off, and runs on iPhone, iPad and Apple Watch. Apple has featured it, and Joe Wicks, The Body Coach, has said it is the fitness app he uses more than any other. BUILD ANY WORKOUT - Start from a HIIT, Tabata or circuit template, or build a timer from scratch with sets, rounds and intervals of different lengths. - Chain timers into one compound timer, so a warm-up flows into the main set and then a cool-down. - Color-code every interval so you know what is coming before the beep. - Share a timer with a friend in one tap. HEAR IT, DON'T WATCH IT - Voice cues call out each interval by name and warn you before the next one starts. - Beeps and bells are there too if you would rather not be talked at. - Play your own music, per timer or per interval. Cues duck the music and it comes back up when they are done. - The timer keeps going in the background while you use other apps or the screen sleeps. ON THE GYM FLOOR - A full-screen, color-coded display you can read from across the room, in portrait or landscape. On iPad it uses the whole screen. - A lock button stops a stray tap from pausing your set. APPLE WATCH - Seconds runs on the watch by itself, so the phone can stay in the locker. Timers you build on the phone sync to the wrist, and Quick Intervals builds a basic circuit on the watch itself. MORE TIMERS - A stopwatch that marks your best and worst laps. - A countdown timer with five preset durations (three on Apple Watch). APPLE HEALTH - Save workouts and mindful sessions to Health. With a heart rate monitor connected, Seconds reads your body measurements and year of birth from Health to estimate calories burned. FREE TO TRY, ONE PAYMENT TO UNLOCK - Everything is available from the first launch. Build any timer and run it. - Each timer locks after you run it once. A single in-app purchase removes the lock on every timer you make. SECONDS AND SECONDS PRO - Seconds Pro is the same app, paid once up front, with nothing to unlock. The two are separate products and a purchase in one does not carry over to the other. If you bought Seconds Pro, download Seconds Pro. If you bought the unlock in Seconds, download Seconds and use Restore Purchases.

About

Next Up

Create and customize interval timers with detailed options for reps, sets, colors, and sounds. Offers flexible display modes, quick actions for navigation, and background notifications. Organize timers with folders and choose between light and dark themes.

Highlights
  • Customizable intervals (reps, sets, colors, sounds)
  • Detailed and full-screen display modes
  • Portrait and landscape orientation support
  • Quick actions for navigation and editing
  • Background notifications
  • Timer organization with folders
Features
Read full description

Customize Your Intervals, Your Way A fully customizable interval timer: Create your intervals. Specify reps, sets, colours and sounds. Tailor it to your purpose and needs. Minimal design and easy to use. Options for rep-based intervals and images. Display options: Choose to run your timer in a detailed view that auto-scrolls through intervals or a full-screen mode for a larger, easily visible display. Both modes support portrait and landscape orientations. Visual details: In detailed view, running intervals and sets are highlighted, providing a clear visual cue. For intervals with multiple reps, the highlighted area indicates the percentage completed. Set optional background colours on intervals for a visual cue. Light and dark mode versions are available and will adapt to your preferences set on your device. Quick actions: Set an interim interval that will automatically be added between intervals. Optionally, end your timer with the interim interval. Skip or backtrack through intervals using intuitive arrow buttons. Swipe actions allow for easy deletion and duplication of intervals and sets. --- Interval Timer features: • Interval timers: Create timers with unlimited intervals. • Description, Length, and Reps: Set the details of each interval, customizing it to your precise requirements. • Interim Intervals: Quickly set up timers by adding interim intervals that run between each interval. • Interval Sets: Group intervals into sets and specify the desired number of set reps. • Interval Customization: Differentiate intervals with background colors. • Time Display: View countdown of each interval and total remaining time, with an option to display total elapsed time. • Progress and Highlighting: View progress with highlighted current intervals and reps completed. • Start from Any Interval: Choose which interval to start the timer from, providing maximum control. • User-friendly Actions: Effortlessly manage intervals with swipe actions for deletion and duplication. Duplicate button allows for easy copying of intervals, sets, and timers. Arrow buttons enable smooth navigation between intervals. • Background Notifications: Run timers in the background and receive alerts for interval changes and timer completion. • Organize with Folders: Create folders to organize and easily access your timers. • Orientation and Display: Enjoy portrait and landscape orientations, and full-screen mode for a larger timer display. • Light and Dark Mode: Seamlessly switch between light and dark mode to suit your preference. Upgrade features include: • Unlimited timers: Create as many timers as you like. • Sound Options: Enable countdown beeps, set interval/timer sounds, and/or enable text to speech. • Rep-based Intervals: Option to create intervals based on reps instead of time to offer maximum flexibility. • More Interval Customization: Differentiate intervals with images/photos and sounds. • Edit received timers: Flexibility to modify all timers. Subscription - syncing and sharing timers: • Sync and Share: Sync timers across devices and choose to share timers and folders with other users. Sharing via email includes a direct download link and instructions. --- Privacy Policy: https://alysha.dev/interval-timer-privacy-policy Terms of Use: https://alysha.dev/interval-timer-terms-of-use

Screenshots

Seconds Interval Timer4 screens
Next Up4 screens

Verdict

The call

The clearest difference is ratings volume: Seconds Interval Timer at 24K against Next Up's 2.8K. Next Up's advantage is iOS requirement (13.0 vs 18.0). On price, rating, review sentiment and update cadence 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. Seconds Interval Timer sells 1 one-off in-app purchase and Next Up sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Seconds Interval Timer against 4.7 for Next Up. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 2.8K, so its average is the more settled of the two. Written reviews split almost evenly too, at 75% and 76% positive.

UpkeepUpdate frequency

Seconds Interval Timer ships an update monthly, Next Up every 5 weeks. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.

Scorecard2 real differences · 8 level
Seconds Interval Timer versus Next Up: the parameters behind the verdict, then further details
ParameterSeconds Interval TimerNext Up
PriceFreeFree
Rating4.7 (24K ratings)4.7 (2.8K ratings)
Positive reviews75.0% of reviews76.0% of reviews — better
Number of ratings24K — better2.8K
Update frequencyMonthly — betterEvery 5 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod
Requires iOS18.013.0 — better
Further details — not scored
Size95 MB22 MB
Age rating4+4+
DeveloperRunloop LtdAlysha Kwok

Customer experience

Seconds Interval Timer

All ratings23,662 ratings
Positive93.0%
Neutral1.9%
Negative5.2%
Written reviews1,237 reviews
Positive75.0%
Neutral6.1%
Negative18.8%

Next Up

All ratings2,831 ratings
Positive93.5%
Neutral3.0%
Negative3.5%
Written reviews208 reviews
Positive76.0%
Neutral6.7%
Negative17.3%

Bugs and requests

Seconds Interval Timer

Reported bugs

2 issues
  • Timer sometimes stops working unexpectedly
  • Issues with restoring purchases on new devices

Requested features

5 requests
  • Ability to change beep/alert volume independently
  • Option to delay transition between intervals
  • Sync workouts across devices
  • More preset workout templates
  • Heart rate monitoring integration

Next Up

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
2 purchases

Next Up

Subscriptions1
  • Syncing and Sharing$3.991 Month
One-time1
  • Upgrade$2.99

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is Next Up free?
Next Up is free to download, with in-app purchases available.
Which has better reviews, Seconds Interval Timer or Next Up?
Seconds Interval Timer and Next Up are both rated 4.7 out of 5 on the App Store, from 24K and 2.8K ratings respectively.
Do Seconds Interval Timer or Next Up have ads?
Neither Seconds Interval Timer nor Next Up shows ads.
Which is updated more often, Seconds Interval Timer or Next Up?
Seconds Interval Timer ships an update monthly, and Next Up every 5 weeks. Most recently, Seconds Interval Timer was updated on September 25, 2026 and Next Up on September 24, 2026.

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