Comparison

Interval Timer vs Kaizen Timer

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

Head to head
About

Interval Timer

This app provides a customizable round-based timer for various time-based activities, including HIIT, circuit training, and boxing. It features a minimalistic design with big digits and bright colors, offering hand-crafted sounds to maintain focus. Users can create complex workouts, save custom sets, and track their workout history with Apple Health integration.

Highlights
  • Customizable round-based timer
  • Minimalistic design with big digits
  • Hand-crafted sounds for focus
  • Unlimited saved intervals
  • Quick Set feature
  • Apple Health integration
  • Dark Mode support
Features
Read full description

The Interval Timer App is a minimalistic, advanced all-in-one round-based timer for iOS Devices (iPhone / iPad). Create complex workouts or sets and get them visualized simple and minimalistic with big digits, bright colors and hand-crafted sounds to support you keeping the focus. Works for all simple and complex time-based activities - use it for your exercise, hiit, tabata, wod, yoga, running, lifting weights, gym workout, cycling, boxing, stretching or even cooking! Create your own set-library with unlimited saved intervals or just hop into a quick one with the "Quick Set" feature! - Pick from a variety of sounds for different phases and cycles - Separate Sound-Volume Setting - Does not interrupt background music - Phone won't lock automatically during sets - Supports Dark Mode - Battery friendly - Customizable color representation for every set - Save your workout-history with apple health! Create simple second-short or complex hour-long intervals with custom set and cycle durations including custom break- and warmup-lengths, round-counts, sounds and colors. ______________________________________________ APP USAGE INFO & SUBSCRIPTION DETAILS Should you choose to upgrade to a subscription, payment will be charged to your iTunes account at confirmation of purchase. Your subscription renews automatically unless cancelled at least 24 hours prior to the end of the current period, and cancellation of the current active subscription period is not allowed. Auto-renewal may be turned off in your Account Settings in iTunes after purchase. You can also manage your subscriptions in Account Settings after purchase. LICENSED APPLICATION END USER LICENSE AGREEMENT: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Service: https://learned-romano-d09.notion.site/Terms-Conditions-4521f83f95f44900931f5887f08b852f Privacy Policy: https://learned-romano-d09.notion.site/Privacy-Policy-3920b87376da4552be9dbc3f0d0d24bf

About

Kaizen Timer

Features
Read full description

Kaizen Timer is a customizable interval timer for boxing, HIIT, Tabata, treadmill workouts, strength training, and more. Build simple work–rest intervals or create advanced multi-phase workouts that match exactly how you train. Start quickly with ready-made presets, or customize every phase, round, work period, and rest period. FEATURES • Presets for popular training styles • Fully customizable work and rest intervals • Advanced phase sequencing for complex workouts • Clear visual and audio timers • Accurate round and phase tracking • Reliable timing when backgrounded or locked • Home Screen widgets for quick access • Light and dark mode support • Optional Apple Health integration for workouts and calorie estimation • Export completed workouts • Available in multiple languages, including: English, French, German, Italian, Russian, Spanish, Japanese, Chinese BUILT FOR CONSISTENCY Set your training intensity and let Kaizen Timer handle the structure. Timers stay accurate even during interruptions, helping you stay focused through every round. FREE TO USE All Kaizen Timer features are available for free. An optional support subscription helps fund ongoing development, but subscribing is never required to access features or content. Train smarter. Stay focused. Improve every round. Terms of Use: https://kaizentimerapp.com/terms.html Privacy Policy: https://kaizentimerapp.com/privacy.html

Screenshots

Interval Timer4 screens
Kaizen Timer4 screens

Verdict

The call

The clearest difference is in-app purchases: Kaizen Timer at none against Interval Timer's 2. On price, update cadence, 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. Interval Timer sells 2 in-app purchases, starting at $1.99 per month. Kaizen Timer asks for nothing beyond the download.

UpkeepUpdate frequency

Interval Timer ships an update every 2 days, Kaizen Timer every 3 days. The most recent releases landed on October 29, 2026 and October 25, 2026 respectively.

Scorecard1 real difference · 9 level
Interval Timer versus Kaizen Timer: the parameters behind the verdict, then further details
ParameterInterval TimerKaizen Timer
PriceFreeFree
Rating4.8 (77 ratings) — better—
Positive reviews93.6% of reviews—
Number of ratings77 — better—
Update frequencyEvery 2 days — betterEvery 3 days
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.0 — better17.6
Further details — not scored
Size19 MB3 MB
Age rating4+4+
DeveloperMizo LLCStefan Dasic

In-app purchases

2 purchases

Interval Timer

Subscriptions1
  • Intervals+ Monthly$1.991 Month
One-time1
  • Intervals+ Lifetime$9.99
None

Kaizen Timer

No in-app purchases

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is Kaizen Timer free?
Kaizen Timer is free to download, with no in-app purchases.
Do Interval Timer or Kaizen Timer have ads?
Neither Interval Timer nor Kaizen Timer shows ads.
Which is updated more often, Interval Timer or Kaizen Timer?
Interval Timer ships an update every 2 days, and Kaizen Timer every 3 days. Most recently, Interval Timer was updated on October 29, 2026 and Kaizen Timer on October 25, 2026.

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