Comparison

Justfit vs IntervalTimer Duo

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

Head to head
About

Justfit

This app provides customizable interval timers for various activities like HIIT, Tabata, meditation, and studying. Track your progress with detailed history and analytics, and personalize your experience with custom sounds and colors.

Highlights
  • Fully customizable interval timers
  • Full-screen circular countdown/countup stopwatch
  • Pre-made templates for HIIT, Tabata, Meditation
  • Customizable audio for intervals, sets, and rest
  • Detailed progress tracking and analytics
  • Timer sharing via export/import
  • Multilanguage support
Features
Read full description

Justfit is the interval timer that stays out of your way. Build a circuit, Tabata, HIIT or boxing timer in seconds and let it run in the background with big, readable digits. WHAT YOU GET • Unlimited intervals, sets and rest — name and color each one • Voice announcements and 3-2-1 countdown, so you never look at the screen • Sounds that cut through your music, then get out of the way • Apple Watch app and complication, Live Activity on the Lock Screen • History, streaks and weekly insights • Widgets and Siri: "Start Tabata in Justfit" FREE VS PRO Free: 3 timers, all basic sounds, 7-day history. Pro unlocks unlimited timers, templates, premium sounds and full insights — monthly, yearly or one-time. PRIVACY No account, no tracking. Your timers stay on your device and, if you choose, in your iCloud. Terms of Use (EULA): https://www.nahitfidanci.com/justfit/terms Privacy Policy: https://www.nahitfidanci.com/justfit/privacy

About

IntervalTimer Duo

Features
Read full description

IntervalTimer Duo is a simple and easy-to-use interval timer app for iPhone and iPad that runs up to 10 timers in sequence. 【Key Uses】 • HIIT (High-Intensity Interval Training) • Pomodoro Technique (work and break cycles) • Cooking timing management • Stretching and yoga routines • Study and rest cycle management 【Features】 • Run your timers back to back, automatically • Build workouts with up to 10 timers — warm up, work, rest, cool down (Premium from the third timer) • Each timer adjustable from 1 second to 60 minutes • Preset feature to save and instantly recall favorite settings (1 preset free; unlimited presets: Premium) • Share presets via link — let friends import your timer setup in one tap • Set counter to track progress toward your target sets (Premium) • Audio notifications and vibration when timers end • Live Activity shows remaining time on Lock Screen and Dynamic Island (Premium) • Customizable alert sounds (extra sounds: Premium) • Simple and intuitive interface 【Preset Sharing】 • Share your favorite timer configurations via link • Recipients can import presets with a single tap • Sync routines with your team or workout partners 【Ease of Use】 • One-tap start, pause, and reset • Quick time setting with preset buttons • Visual circular progress bars show remaining time • Second timer can be enabled/disabled as needed • Set counter tracks completed sets toward your goal 【Free & Premium】 The app is free to download and use. After installing, all premium features are unlocked for a 14-day free trial. When the trial ends, premium features require a one-time purchase (pay once, use forever) — a Universal Purchase shared between iOS and macOS. Free forever: • Two timers running alternately (1 second to 60 minutes each) • One saved preset • Basic alert sounds • Audio and vibration notifications when timers end • Circular progress bar • Preset sharing via link (sending and receiving are both free) Premium (one-time purchase, or during the free trial): • A third timer and beyond (up to 10, each with its own name and sound) • Unlimited presets • Set counter • Additional premium alert sounds • Live Activity on Lock Screen and Dynamic Island 【Compatibility】 • iPhone and iPad • Available in English, Japanese, French, German, and Spanish 【Universal Purchase】 If you own the macOS version, you can use the iOS version at no additional cost. A simple yet fully-featured interval timer app that's perfect for any timing needs. Privacy Policy: https://techback.info/interval-timer/ios/privacy-policy.html Terms of Use (EULA): https://techback.info/interval-timer/ios/terms-of-use.html

Screenshots

Justfit4 screens
IntervalTimer Duo4 screens

Verdict

The call

The clearest difference is update cadence: Justfit at every 3 days against IntervalTimer Duo's every 3 weeks. Justfit also leads on iOS requirement (15.0 vs 26.1). On price, ads, in-app purchases 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. Justfit sells 4 in-app purchases, starting at $1.99 per month and IntervalTimer Duo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Justfit ships an update every 3 days, IntervalTimer Duo every 3 weeks. The most recent releases landed on October 3, 2026 and October 9, 2026 respectively.

Scorecard2 real differences · 8 level
Justfit versus IntervalTimer Duo: the parameters behind the verdict, then further details
ParameterJustfitIntervalTimer Duo
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPod, Apple WatchiPhone, iPad, Mac
Requires iOS15.0 — better26.1
Further details — not scored
Size104 MB10 MB
Age rating4+4+
DeveloperFerda Nahit Fidancikosuke konuma

In-app purchases

4 purchases

Justfit

Subscriptions2
  • Monthly$1.991 Month
  • Annual$7.991 Year
One-time2
  • Lifetime Access$3.99
  • Lifetime Access$7.99
1 purchases

IntervalTimer Duo

One-time1
  • Full Version$2.99

Questions

Is Justfit free?
Justfit is free to download, with in-app purchases available.
Is IntervalTimer Duo free?
IntervalTimer Duo is free to download, with in-app purchases available.
Do Justfit or IntervalTimer Duo have ads?
Neither Justfit nor IntervalTimer Duo shows ads.
Which is updated more often, Justfit or IntervalTimer Duo?
Justfit ships an update every 3 days, and IntervalTimer Duo every 3 weeks. Most recently, Justfit was updated on October 3, 2026 and IntervalTimer Duo on October 9, 2026.

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