Comparison

Seconds Interval Timer vs StrengthTempo

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

StrengthTempo

Features
Read full description

StrengthTempo is a focused strength training timer built for lifters who care about rhythm, control, and consistency. StrengthTempo now supports more languages and lets you share completed workouts as images, making it easier to use, save, and share your training progress. Set precise timing for every rep phase, follow your workout with clear cues, and keep your training organized with an action library, training setups, and cycles that are easy to manage. Whether you are working on better form, stricter tempo, or more repeatable sessions, StrengthTempo helps you stay locked in from the first rep to the last. What makes StrengthTempo different StrengthTempo is designed for real lifting sessions, not for endless setup. It gives you the structure you need to train with intent while keeping the interface fast, simple, and gym-friendly. Use it to: Set exact rep tempo for eccentric, pause, and concentric phases Build and organize your action library Create training setups for different sessions Arrange cycles so you know what to train each day Run focused sessions with clear timing cues Review completed workouts and recent training history Key features Precise tempo control Create custom tempo settings for each lift so every rep is more controlled, consistent, and repeatable. Action library, training, and cycles Keep your lifting organized with reusable actions, structured training setups, and cycles that help you stay on plan. Session-first training flow Start quickly, manage your session clearly, and move through each lift without unnecessary friction. Optional haptics and sound cues Stay on tempo without staring at the screen. Use haptics and light audio cues for phase changes when you want extra guidance. Workout history Look back at recent sessions and track what you trained. Offline-first, with optional sync Use the app fully offline, with optional iCloud sync when you want your data available across devices. Built for focused lifters StrengthTempo is made for lifters who want cleaner reps, better rhythm, and a more structured training flow. If tempo matters to your training, this app is built for you. Train with purpose. Move with rhythm. Make every rep count. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Seconds Interval Timer4 screens
StrengthTempo3 screens

Verdict

The call

Seconds Interval Timer and StrengthTempo are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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 StrengthTempo sells 4 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Seconds Interval Timer ships an update monthly, StrengthTempo every 3 weeks. The most recent releases landed on September 25, 2026 and September 10, 2026 respectively.

ScorecardNo meaningful differences
Seconds Interval Timer versus StrengthTempo: the parameters behind the verdict, then further details
ParameterSeconds Interval TimerStrengthTempo
PriceFreeFree
Rating4.7 (24K ratings) — better—
Positive reviews75.0% of reviews—
Number of ratings24K — better—
Update frequencyMonthlyEvery 3 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS18.0 — better18.6
Further details — not scored
Size95 MB13 MB
Age rating4+4+
DeveloperRunloop Ltd小雨 李

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

StrengthTempo

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
4 purchases

StrengthTempo

Subscriptions3
  • StrengthTempo Pro Monthly$3.991 Month
  • StrengthTempo Pro Quarterly$9.993 Months
  • StrengthTempo Pro Annual$29.991 Year
One-time1
  • StrengthTempo Pro Lifetime$79.99

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is StrengthTempo free?
StrengthTempo is free to download, with in-app purchases available.
Do Seconds Interval Timer or StrengthTempo have ads?
Neither Seconds Interval Timer nor StrengthTempo shows ads.
Which is updated more often, Seconds Interval Timer or StrengthTempo?
Seconds Interval Timer ships an update monthly, and StrengthTempo every 3 weeks. Most recently, Seconds Interval Timer was updated on September 25, 2026 and StrengthTempo on September 10, 2026.

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