Comparison

HIIT Interval Timer vs Kronos Studio

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

Head to head
About

HIIT Interval Timer

This app provides customizable interval timers for various workout styles like HIIT, Tabata, EMOM, and AMRAP. Track your progress, set weekly goals, and enjoy estimated calorie burn with shareable workout summaries. It offers a free version with core features and a Pro version for enhanced customization and an ad-free experience.

Highlights
  • Customizable interval timers
  • Multiple workout modes (HIIT, Tabata, EMOM, AMRAP)
  • Weekly goal tracking
  • Estimated calorie burn
  • Workout sharing options
  • Sound and haptic cues
  • Customizable themes
Features
Read full description

An interval timer for Tabata, HIIT, EMOM and AMRAP. Open it, set it, start. No subscription and no account. ā–  Free • Three modes (HIIT, EMOM, AMRAP) and built-in presets such as Tabata 20/10 Ɨ 8 • Save your own presets (up to 2) • A weekly goal with "this week 2/3" progress on the home screen • A weekly review and a rest pass (once a week) to protect your streak • Coach reminders that tell you how many workouts are left to your goal (only if you turn them on) • Estimated calories for each workout, with food equivalents • Share cards: This workout, Last 30 days, and Over a photo (a transparent image) • A calendar and stats that show the weeks you kept going • Sound effects and haptics; choose a whistle or wood block for the cues • Four themes and tidy, grouped settings ā–  HIIT Timer Pro (one-time purchase, no subscription) • No ads • Unlimited presets, in your own order • Weekly plan: set a time and a preset for each day of the week and get a reminder then • Preset colors: the calendar marks each day with the color of the preset you did • The My Record share card and the Receipt style • All-time calories and food equivalents, trends (last 4 weeks) and a weight log • All-time stats and CSV export ā–  Peace of mind • Your weight stays on your device. No account needed. • Calories are estimates based on your weight and exercise intensity (MET). Actual burn varies from person to person. Great for home HIIT and Tabata, strength intervals, EMOM and AMRAP WODs, circuits, jump rope and boxing rounds.

About

Kronos Studio

Features
Read full description

Real strength workouts, written for the gear you've got and the 30 minutes you have. Open Kronos and today's session is ready: exercises, sets and the weights filled in, built for the equipment in front of you and the minutes you named. Different every time, shaped to your gear, your time, and how you actually feel today. You don't need more motivation. You need fewer decisions. IT ALREADY KNOWS • It already knows what's at your gym. • It already knows you only have 20 minutes. • It already knows you skipped Tuesday. • It already knows you hated lunges last time. • It already knows you've done legs twice this week. So you don't have to. HOW ONE TAP WORKS BUILT AROUND YOUR ACTUAL GEAR. A pair of dumbbells, a full gym, or nothing at all: tell Kronos what you have and it never writes a workout that needs a cable machine someone else is on. It fills in the weight, too, instead of leaving you a blank. HOTEL ROOM? HOTEL WORKOUT. Save your spots: gym, home, hotel, the park. Switch in one tap and the workout reshapes itself. Flag an injury once and it plans around that too. SWIPE EXERCISES, NOT EX'S. Love it, like it, meh, never again. Every swipe trains the next workout. PROGRAMS THAT BEND. Seventeen programs, 2 to 8 weeks each, written for your gear and shaped to your week instead of the other way round. The first session of every one is free. Any day you'd rather not be on one, build a single session instead. TRAIN WITH YOUR CREW Start a challenge, drop the code in the group chat, and every finished day puts your name on the Wall beside theirs. Pick a shape: a daily target, a ladder, a weekly max test, or just show up. Wildcards cover a missed day, streaks carry, and nobody gets a notification about your rest day. It's the part that makes people keep going, and it isn't a leaderboard for strangers. It's five people you already know. A BIG CALM TIMER We tell you what's next; you just lift. No tapping mid-set. Then swipe: right to keep, left for never again. Benchmarks are in there too. Cindy, Murph, and 42 more, each one scaled to the kit you actually own instead of the kit the workout assumed. LOGGING, WHEN YOU WANT IT Log a set if you want the number. Skip it if you don't. Your week, your lifts, and your history are there when you go looking, and never the price of getting a workout. PLUS A FREE INTERVAL TIMER. ACTUALLY FREE. HIIT, Tabata, EMOM, AMRAP, plus full custom intervals. Save unlimited presets. The screen stays awake, the cues mix over your music, and there are no ads. No account needed, no "Pro timer" upsell. Not now, not ever. WHAT WE BELIEVE Variety beats optimization. Constraints are features. Decisions are willpower taxes. Today's mood matters. Adherence beats intensity. Fun is a strategy. A B+ workout four days a week beats an A+ workout once. Every time. KRONOS PRO Free is the interval timer, forever, plus five workouts written for your gear and the first session of every program. Pro is the rest: a new workout every day you open the app, every session of all 17 programs, your whole history scored, up to 10 challenges at once, and crew insights. Prices are shown in the app and may vary by region. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. Terms: https://getkronos.app/terms Privacy: https://getkronos.app/privacy Most fitness apps make you a workout plan. Kronos makes you a person who works out. The best workout is the one you'll actually do.

Screenshots

HIIT Interval Timer4 screens
Kronos Studio4 screens

Verdict

The call

The clearest difference is ads: Kronos Studio at none against HIIT Interval Timer's shown. Kronos Studio also leads on update cadence (every 3 days vs fortnightly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. HIIT Interval Timer sells 1 one-off in-app purchase and Kronos Studio sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

HIIT Interval Timer ships an update fortnightly, Kronos Studio every 3 days. The most recent releases landed on October 30, 2026 and October 28, 2026 respectively.

Scorecard2 real differences Ā· 6 level
HIIT Interval Timer versus Kronos Studio: the parameters behind the verdict, then further details
ParameterHIIT Interval TimerKronos Studio
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyFortnightlyEvery 3 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.0 — better16.4
Further details — not scored
Size98 MB102 MB
Age rating4+12+
Developertsyk-appMuller Labs LLC

In-app purchases

1 purchases

HIIT Interval Timer

One-time1
  • HIIT Timer Pro$4.99
2 purchases

Kronos Studio

Subscriptions2
  • Kronos Pro Monthly$8.991 Month
  • Kronos Pro Yearly14 Days trial$49.991 Year

Questions

Is HIIT Interval Timer free?
HIIT Interval Timer is free to download, with in-app purchases available.
Is Kronos Studio free?
Kronos Studio is free to download, with in-app purchases available.
Do HIIT Interval Timer or Kronos Studio have ads?
HIIT Interval Timer shows ads; Kronos Studio does not.
Which is updated more often, HIIT Interval Timer or Kronos Studio?
HIIT Interval Timer ships an update fortnightly, and Kronos Studio every 3 days. Most recently, HIIT Interval Timer was updated on October 30, 2026 and Kronos Studio on October 28, 2026.

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