Comparison

Seconds Interval Timer vs 12 Minute Athlete HIIT Timer

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

12 Minute Athlete HIIT Timer

This app provides a programmable interval timer and stopwatch for various workout types, including HIIT and bodyweight exercises. It offers features like saving favorite timers, playing your own music, and sharing workouts. An upgrade unlocks a large library of guided HIIT workouts with exercise demonstrations.

Highlights
  • Programmable interval timer
  • Save favorite interval timers
  • Intuitive and easy-to-use design
  • Play your own music during workouts
  • Share workouts on social media
  • Library of guided HIIT workouts (paid)
  • Exercise instructions and videos (paid)
Features
Read full description

12 Minute Athlete HIIT Timer is a programmable interval timer and stopwatch perfect for interval workouts and HIIT training. Whether you're into bodyweight workouts, sprinting, weights, CrossFit, boxing, MMA or HIIT, the 12 Minute Athlete free app is an easy-to-use, beautifully designed tool perfect for all your workout needs. Key features: - Easily program your high/low interval and number of intervals - Save your favorite interval timers for easy access - Simple functionality, intuitive design, easy to use - Post your workout to Twitter or Facebook - Play your own music during your workout Perfect for use with 12minuteathlete.com workouts or any workout of your choice! **Upgrade to the full 12 Minute Athlete app for these awesome features: - 185+ full-body HIIT workouts to choose from. Workouts are either 12 minutes, 16 minutes or time challenge. - Short, intense workouts focus on strength, cardio, interval and core training. - Seven possible equipment choices with option to choose bodyweight-only workout as well. - 35+ bodyweight and equipment-based exercises included. - Access to step-by-step instructions and video demonstrations for every exercise at any time. - Ability to save favorite workouts and interval timers for easy access. - Share your workout on Facebook and Twitter. - Interval timer and stopwatch gives you the option to do your own workouts at any time.

Screenshots

Seconds Interval Timer4 screens
12 Minute Athlete HIIT Timer4 screens

Verdict

The call

The clearest difference is in-app purchases: 12 Minute Athlete HIIT Timer at none against Seconds Interval Timer's 1. 12 Minute Athlete HIIT Timer also leads on rating (4.9 vs 4.7) and review sentiment (84% vs 74%). Seconds Interval Timer's advantage is ratings volume (24K vs 29) and update cadence (monthly vs every 4 months). On price, ads, monetization model and device support 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. 12 Minute Athlete HIIT Timer asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

12 Minute Athlete HIIT Timer holds the better App Store score, 4.9 against 4.7. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 29, so its average is the more settled of the two. Written reviews point the same way: 74% of Seconds Interval Timer's written reviews are positive against 84% of 12 Minute Athlete HIIT Timer's.

UpkeepUpdate frequency

Seconds Interval Timer ships an update monthly, 12 Minute Athlete HIIT Timer every 4 months. The most recent releases landed on October 20, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
Seconds Interval Timer versus 12 Minute Athlete HIIT Timer: the parameters behind the verdict, then further details
ParameterSeconds Interval Timer12 Minute Athlete HIIT Timer
PriceFreeFree
Rating4.7 (24K ratings)4.9 (29 ratings) — better
Positive reviews74.5% of reviews84.4% of reviews — better
Number of ratings24K — better29
Update frequencyMonthly — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPod
Requires iOS18.07.0 — better
Further details — not scored
Size95 MB3 MB
Age rating4+4+
DeveloperRunloop Ltd12 Minute Athlete

Customer experience

Seconds Interval Timer

All ratings23,711 ratings
Positive93.0%
Neutral1.9%
Negative5.2%
Written reviews1,277 reviews
Positive74.5%
Neutral6.3%
Negative19.2%

12 Minute Athlete HIIT Timer

All ratings29 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews32 reviews
Positive84.4%
Neutral9.4%
Negative6.3%

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

12 Minute Athlete HIIT Timer

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
None

12 Minute Athlete HIIT Timer

No in-app purchases

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is 12 Minute Athlete HIIT Timer free?
12 Minute Athlete HIIT Timer is free to download, with no in-app purchases.
Which has better reviews, Seconds Interval Timer or 12 Minute Athlete HIIT Timer?
12 Minute Athlete HIIT Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while 12 Minute Athlete HIIT Timer averages 4.9 from 29 ratings.
Do Seconds Interval Timer or 12 Minute Athlete HIIT Timer have ads?
Neither Seconds Interval Timer nor 12 Minute Athlete HIIT Timer shows ads.
Which is updated more often, Seconds Interval Timer or 12 Minute Athlete HIIT Timer?
Seconds Interval Timer ships an update monthly, and 12 Minute Athlete HIIT Timer every 4 months. Most recently, Seconds Interval Timer was updated on October 20, 2026 and 12 Minute Athlete HIIT Timer on October 16, 2026.

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