Comparison

IntervalTimer Duo vs Round

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

Head to head
About

IntervalTimer Duo

Features
Read full description

IntervalTimer Duo is a simple and easy-to-use interval timer app for iPhone and iPad that alternates between two customizable timers. 【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】 • Automatically alternate between two timers • 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 (Premium) • 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 Premium (one-time purchase, or during the free trial): • Unlimited presets • Preset sharing via link • 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

About

Round

This interval timer is designed for high-intensity interval training (HIIT), Tabata, and circuit workouts. It allows users to create custom routines with multiple exercises and track their progress. The app offers haptic alerts and can be controlled from an Apple Watch.

Highlights
  • Customizable interval routines
  • HIIT, Tabata, and circuit training support
  • Apple Watch control
  • Haptic alerts for round changes
  • Visual arc timer
  • Workout progress tracking
  • Apple Health integration
Features
Read full description

Round is a visual interval timer for HIIT, Tabata, circuit training, strength workouts, mobility, and stretching. TRAIN WITH 3D MOVEMENT GUIDES Choose from 71 exercises and see each movement in 3D while building your routine and while the timer runs. Side-specific and alternating exercises are handled clearly, so you always know what comes next. BUILD A ROUTINE IN SECONDS • Start with a ready-made template or build from the exercise catalog • Reorder, duplicate, edit, and delete steps directly • Add custom exercises with your own name and emoji • Set work, step rest, set rest, preparation, and number of sets STAY FOCUSED • Follow the 3D animation or switch to a larger remaining-time display • See your current step, progress, and upcoming lineup at a glance • Audio and haptic cues announce every transition WORKS WITH WATCH Control your workout from your wrist and receive haptic cues without reaching for your iPhone. TRACK YOUR PROGRESS • Sessions are logged automatically • Review total training time, streaks, and your most-used routines • Save workouts to Apple Health • Delete individual history entries whenever needed No account. No ads. Fully offline.

Screenshots

IntervalTimer Duo4 screens
Round4 screens

Verdict

The call

The clearest difference is in-app purchases: Round at none against IntervalTimer Duo's 1. Round also leads on update cadence (weekly vs every 2 weeks) and iOS requirement (17.2 vs 26.1). On price, 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

Both are free to download. IntervalTimer Duo sells 1 one-off in-app purchase. Round asks for nothing beyond the download.

UpkeepUpdate frequency

IntervalTimer Duo ships an update every 2 weeks, Round weekly. The most recent releases landed on September 7, 2026 and September 24, 2026 respectively.

Scorecard3 real differences · 6 level
IntervalTimer Duo versus Round: the parameters behind the verdict, then further details
ParameterIntervalTimer DuoRound
PriceFreeFree
Rating—4.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 2 weeksWeekly — better
AdsNoNo
In-app purchasesYesNo — better
Monetization—Free
DevicesiPhone, iPad, MaciPhone, iPad, Apple Watch
Requires iOS26.117.2 — better
Further details — not scored
Size10 MB34 MB
Age rating4+4+
Developerkosuke konumaRyosuke Nakayama

In-app purchases

1 purchases

IntervalTimer Duo

One-time1
  • Full Version$2.99
None

Round

No in-app purchases

Questions

Is IntervalTimer Duo free?
IntervalTimer Duo is free to download, with in-app purchases available.
Is Round free?
Round is free to download, with no in-app purchases.
Do IntervalTimer Duo or Round have ads?
Neither IntervalTimer Duo nor Round shows ads.
Which is updated more often, IntervalTimer Duo or Round?
IntervalTimer Duo ships an update every 2 weeks, and Round weekly. Most recently, IntervalTimer Duo was updated on September 7, 2026 and Round on September 24, 2026.

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