Comparison

Seconds Interval Timer vs Fitness Fortify

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 interval timer app helps you build and run custom workouts for HIIT, Tabata, and circuits. It provides voice cues, runs in the background, and syncs with Apple Watch. Save workouts to Apple Health and track calories burned.

Highlights
  • Build custom timers for any workout
  • Voice cues for intervals
  • Runs in background with screen off
  • Syncs with Apple Watch
  • Color-coded interval display
  • Save workouts to Apple Health
  • Play music with cues
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

Fitness Fortify

This free fitness app helps users stay motivated with customizable timers, a random exercise generator, and a full workout builder. Easily share your progress via SMS, email, or social media. Track intervals and rest periods effortlessly to enhance your training.

Highlights
  • Customizable workout timers
  • Random exercise generator
  • Core exercise focus
  • Full workout builder
  • Progress sharing
  • Interval and rest period tracking
Features
Read full description

Fitness Fortify is a powerful, offline-ready fitness and F3 workout companion built to help you train with purpose, wherever you are. Generate complete workouts in seconds with customizable Warmup, Beatdown, and Mary sections. Choose the number of exercises, include repetition counts, regenerate sections, edit exercises, reorder movements, and save workouts for later. Use Random Exercise and Random Mary to quickly choose your next movement without repeating exercises until the full library has been used. Train with reliable timers designed for real workouts: • 15, 30, 60, and 120-second presets • Custom countdown timers • Count-up stopwatch • Visible 3-2-1 preparation countdown • Large, easy-to-read timer display • Pause, resume, reset, and stop controls • Audio cues and haptic feedback • Final-three-second warning • Screen stays awake during active timers Create professional F3-style Backblasts with fields for date, AO, PAX, Q, total, FNG, conditions, Mary, and closing notes. Share workouts and Backblasts through Messages, Mail, AirDrop, and other iOS sharing destinations. Your workout history is saved locally, allowing you to revisit, reuse, share, or delete previous workouts. Customize all exercise libraries by adding, editing, deleting, and restoring exercises. Fitness Fortify includes a clean dark interface, bold orange accents, high-contrast typography, native iOS controls, and YourFullStack branding. No account required. No subscription required. No mandatory internet connection. Core workout generation, timers, history, editing, saving, and sharing work offline. Built for early mornings, group workouts, garage gyms, and anyone ready to show up and get stronger

Screenshots

Seconds Interval Timer4 screens
Fitness Fortify4 screens

Verdict

The call

The clearest difference is price: Seconds Interval Timer at Free against Fitness Fortify's $2.99. Seconds Interval Timer also leads on update cadence (monthly vs every 12 months) and ratings volume (24K vs 9). Fitness Fortify's advantage is in-app purchases (none vs 1) and review sentiment (86% vs 74%). On rating, ads 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

Seconds Interval Timer is free to download; Fitness Fortify costs $2.99 up front. Seconds Interval Timer sells 1 one-off in-app purchase. Fitness Fortify asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.7 for Seconds Interval Timer against 4.6 for Fitness Fortify. That said, the two scores are not equally well evidenced: Seconds Interval Timer has 24K ratings behind it against 9, so its average is the more settled of the two. Written reviews are what separate them: 74% of Seconds Interval Timer's written reviews are positive against 86% of Fitness Fortify's.

UpkeepUpdate frequency

Seconds Interval Timer ships an update monthly, Fitness Fortify every 12 months. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.

Scorecard7 real differences · 3 level
Seconds Interval Timer versus Fitness Fortify: the parameters behind the verdict, then further details
ParameterSeconds Interval TimerFitness Fortify
PriceFree — better$2.99
Rating4.7 (24K ratings) — better4.6 (9 ratings)
Positive reviews74.5% of reviews85.7% of reviews — better
Number of ratings24K — better9
Update frequencyMonthly — betterEvery 12 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPad, Apple Watch — betteriPhone, iPad
Requires iOS18.0 — better26.6
Further details — not scored
Size99 MB3 MB
Age rating4+4+
DeveloperRunloop LtdYOURFULLSTACK, LLC

Customer experience

Seconds Interval Timer

All ratings23,780 ratings
Positive92.9%
Neutral1.9%
Negative5.2%
Written reviews1,289 reviews
Positive74.5%
Neutral6.4%
Negative19.1%

Fitness Fortify

All ratings9 ratings
Positive88.9%
Neutral11.1%
Negative0.0%
Written reviews7 reviews
Positive85.7%
Neutral14.3%
Negative0.0%

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

Fitness Fortify

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Seconds Interval Timer

One-time1
  • Advanced Version$7.99
None

Fitness Fortify

No in-app purchases

Questions

Is Seconds Interval Timer free?
Seconds Interval Timer is free to download, with in-app purchases available.
Is Fitness Fortify free?
Fitness Fortify costs $2.99, with no in-app purchases.
Which has better reviews, Seconds Interval Timer or Fitness Fortify?
Seconds Interval Timer is rated higher. Seconds Interval Timer averages 4.7 out of 5 from 24K ratings, while Fitness Fortify averages 4.6 from 9 ratings.
Do Seconds Interval Timer or Fitness Fortify have ads?
Neither Seconds Interval Timer nor Fitness Fortify shows ads.
Which is updated more often, Seconds Interval Timer or Fitness Fortify?
Seconds Interval Timer ships an update monthly, and Fitness Fortify every 12 months. Most recently, Seconds Interval Timer was updated on November 11, 2026 and Fitness Fortify on November 10, 2026.

Other comparisons