Comparison

THIM vs HIIT Interval Timer

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

Head to head
About

THIM

This app helps you improve sleep quality through a unique conditioning program developed by a sleep scientist. It tracks sleep stages, offers power naps, and features a smart alarm to wake you from light sleep. Monitor your sleep efficiency with a score used in sleep clinics.

Highlights
  • Sleep conditioning program
  • Track sleep quality and stages
  • Accurate 10-minute power naps
  • Smart alarm for light sleep wake-ups
  • Sleep efficiency scoring
  • Community for sleep optimization
Features
Read full description

THIM is the ring that conditions you for better sleep. Sleep well tonight and get the most from tomorrow. Developed by sleep scientist Professor Leon Lack, use one of THIM’s many novel features: β€’ IMPROVE SLEEP – THIM offers a unique sleep-conditioning program designed to help you fall asleep sooner and reduce wakefulness across the night. β€’ TRACK SLEEP QUALITY - Use your phone to track your sleep quality throughout the night including stages of sleep and periods of wakefulness. β€’ POWER NAP – THIM determines when you fall asleep to the nearest minute. No other device can deliver this accuracy. This ensures exactly 10-mins of sleep during your nap – the time needed to avoid sleep inertia upon waking. β€’ SMART ALARM – Waking from deep sleep is not pleasant. In contrast, waking from light sleep feels great. Use this feature to ensure you wake from a light stage of sleep so you bounce out of bed in the morning and enjoy a great start to the day. β€’ MONITOR SLEEP EFFICIENCY – THIM provides a unique sleep efficiency score for each night of sleep. This algorithm is used by sleep clinics to score sleep studies. β€’ JOIN OUR COMMUNITY – Join thousands of people whom have traded in their non-assistive sleep tracker for a product, which contains novel, evidenced-based programs to improve and optimize your sleep. Other device's can only track sleep. THIM improves sleep. Welcome.

About

HIIT Interval Timer

This interval training app offers customizable timers for various workout styles like HIIT, Tabata, EMOM, and AMRAP. It provides structured programs, progress tracking, and estimated calorie burn, with an optional one-time purchase for an ad-free experience and expanded features.

Highlights
  • Customizable interval timers
  • HIIT, Tabata, EMOM, AMRAP modes
  • Structured 4-week workout programs
  • Progress tracking and stats
  • Estimated calorie burn
  • Preset saving and scheduling
  • Sound effects and haptic feedback
Features
Read full description

An interval timer for Tabata, HIIT, EMOM and AMRAP. Open it, set it, start. No subscription and no account. When you first open it, choose how many workouts a week and when to be reminded. The app reminds you then. β–  Free β€’ Three modes (HIIT, EMOM, AMRAP) and built-in presets such as Tabata 20/10 Γ— 8 β€’ Week 1 of the 4-week program: pick a goal (build fitness, lose weight or feel refreshed) and get three workouts a week that get a little harder each week β€’ Save your own presets (up to 2) β€’ A weekly goal with "this week 2/3" progress on the home screen β€’ After your first workout of the week, pick your next one: tomorrow, the day after, or in 3 days. With notifications on, you get a one-time reminder β€’ A weekly review and a rest pass (once a week) to protect your streak β€’ Coach reminders that tell you how many workouts are left to your goal (only if you turn them on) β€’ Estimated calories for each workout, with food equivalents β€’ Share cards: This workout, Last 30 days, and Over a photo (a transparent image) β€’ A calendar and stats that show the weeks you kept going, plus a preview of your trends and all-time totals β€’ Sound effects and haptics; choose a whistle or wood block for the cues β€’ Three themes (new installs start with White) and tidy, grouped settings β–  HIIT Timer Pro (one-time purchase, no subscription) β€’ No ads β€’ The 4-week program from week 2 to the end β€’ Unlimited presets, in your own order β€’ Weekly plan: set a time and a preset for each day of the week and get a reminder then β€’ Preset colors: the calendar marks each day with the color of the preset you did β€’ The My Record share card and the Receipt style β€’ All-time calories and food equivalents, trends (last 4 weeks) and a weight log β€’ All-time stats and CSV export β–  Try Pro for 7 days β€’ Use everything in Pro free for 7 days (once). β€’ No automatic charge. The trial ends on its own after 7 days and ads come back. Your records and presets stay. β€’ To keep Pro, buy HIIT Timer Pro once. β–  Peace of mind β€’ Your weight stays on your device. No account needed. β€’ 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.

Screenshots

THIM4 screens
HIIT Interval Timer4 screens

Verdict

The call

The clearest difference is review sentiment: HIIT Interval Timer at 100% against THIM's 0%. HIIT Interval Timer also leads on update cadence (every 2 weeks vs every 2 months). THIM's advantage is in-app purchases (none vs 2) and ads (none vs shown). On price and device support there is nothing between them.

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

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

Both are free to download. HIIT Interval Timer sells 2 one-off in-app purchases. THIM asks for nothing beyond the download.

UpkeepUpdate frequency

THIM ships an update every 2 months, HIIT Interval Timer every 2 weeks. The most recent releases landed on November 3, 2026 and November 7, 2026 respectively.

Scorecard6 real differences Β· 2 level
THIM versus HIIT Interval Timer: the parameters behind the verdict, then further details
ParameterTHIMHIIT Interval Timer
PriceFreeFree
Positive reviews0.0% of reviews100.0% of reviews β€” better
Update frequencyEvery 2 monthsEvery 2 weeks β€” better
AdsNo β€” betterYes
In-app purchasesNo β€” betterYes
MonetizationFree β€” betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod β€” better
Requires iOS12.0 β€” better15.0
Further details β€” not scored
Size96 MB107 MB
Age rating12+4+
DeveloperRe-Time Pty Ltdtsyk-app

Customer experience

THIM

Written reviews5 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

HIIT Interval Timer

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

THIM

No in-app purchases

2 purchases

HIIT Interval Timer

One-time2
  • 7-day TrialFree
  • HIIT Timer Pro$4.99

Questions

Is THIM free?
THIM is free to download, with no in-app purchases.
Is HIIT Interval Timer free?
HIIT Interval Timer is free to download, with in-app purchases available.
Do THIM or HIIT Interval Timer have ads?
HIIT Interval Timer shows ads; THIM does not.
Which is updated more often, THIM or HIIT Interval Timer?
THIM ships an update every 2 months, and HIIT Interval Timer every 2 weeks. Most recently, THIM was updated on November 3, 2026 and HIIT Interval Timer on November 7, 2026.

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