Comparison

Interval Timer vs INR Tracker

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 helps you manage workout intervals with customizable work and rest periods. It runs in the background and allows music playback, with options to save settings and share progress. Integrates with Apple Health for heart rate monitoring.

Highlights
  • Customizable sets, intervals, and rest times
  • Runs in background and with screen locked
  • Music playlist integration
  • Save settings as templates
  • Apple Health integration for heart rate
  • Post workouts to social media
Features
Read full description

***Free and reliable. Perfect for use at home, at the track or in the gym. We’re proud to introduce this handy little app that helps you keep track of your work and rest periods during workouts. Whether your into cycling, running, lifting weights, exercise, workout, stretching, boxing, MMA or HIT, this interval timer will prove to be an invaluable asset to you. Running foreground, background or with device locked, this reliable app allows you specify an overall time as well as program High/Low intensity interval and rest time between sets. Produced by Polycents! Key Features: - Customizable sets, high/low intensity interval and rest for your own need - Retina display, iOS4 and multitasking - Continue to run even when screen is locked - Play your song or playlist during your workout - Post your workout to Facebook or Twitter - Save settings as templates Customizable Features: - Number of Sets - Countdown Time - Set Time - Low Interval time - High Interval time - Rest Time - First Interval (low or high) - Sound Volume - Timer Sounds - Auto Lock - Vibrate - Pause during Rest - Playlist - New Each Set APPLE HEALTH: -Interval Timer can use Apple Health to show heart rate in Apple Watch App. # Subscription Details # - Monthly and annual subscriptions are available. - Payment will be charged to your iTunes account at confirmation of purchase. - Your subscription will automatically renew unless auto-renew is disabled at least 24 hours before the end of the current subscription period. - Automatic renewals will be charged at the same price you were originally charged for the subscription. - Subscriptions can be managed by going to Account Settings on the App Store after purchase. Terms of Use: https://www.iubenda.com/terms-and-conditions/18915396 Privacy Policy: https://www.iubenda.com/privacy-policy/18915396

About

INR Tracker

Features
Read full description

INR Tracker is a personal logbook for people taking warfarin. It records the INR results, doses, vitamin K, activity, and events you enter, and shows them back to you as lists, charts, and a printable report — nothing more. What you can record - INR test results, with the date - Your warfarin dose schedule as a weekday pattern, and which doses you actually took — the weekly total is worked out automatically from what you enter, never typed in separately - Vitamin K intake, from a food reference list or as a precise figure you enter yourself - Physical activity — type, duration, and intensity - Body weight and alcohol units, one figure per day - Other health events, such as a new or stopped medication, illness, or a change in weight, as a dated entry Reminders Set your own schedule for test reminders and clinic-report reminders. Reminders fire on the schedule you set. Charts and a timeline See your recorded readings, doses, vitamin K, and activity laid out on shared timelines you can read side by side. You see exactly what you entered — nothing is scored, labelled, or rated. A report for your clinic Generate a printable PDF of your recorded data to bring or send to your clinic, and mark reports as sent. Your data, on your device Everything you record is stored encrypted on your device. There is no account, no cloud sync, and no advertising or analytics tracking of any kind. Export a backup any time, encrypted if you give it a passphrase, and restore it later. Photos you attach are stored encrypted on your device too, with location data removed, and are included in the backups you make. Workouts and weight you import from Apple Health are stored the same way: the app reads them only while you use Import from Health, never writes anything to Apple Health, and never sends them to us or anyone else; they leave your device only in a backup, export or report you make. When you scan your meter, the photo is read on your device by Apple's built-in text recognition and is not kept. What this app does not do This app records what you enter. It does not calculate a dose, interpret a result, or predict an outcome. It does not check for drug interactions. Decisions about your dose and your care are your clinic's, not the app's. INR Tracker is not a substitute for professional medical care and is not a medical device. Your INR timeline chart is free. A one-time purchase unlocks five further charts — weekly dose, vitamin K and activity on shared timelines with it, plus consistency and an INR range summary — two charts that put your recorded weight and alcohol units on a timeline with your INR, importing workouts and weight from Apple Health (read only, while you use the import screen), a "since your last report" summary with a detailed clinic email, the PDF clinic-report export, a printable dose calendar (a month of planned doses from your recorded schedule), an annual logbook (a year of your records, month by month), photos attached to INR readings, dose schedules and health events (a meter display or a clinic dose letter, for example), scanning your meter's display with the camera to fill in an INR reading, which you check and save yourself, a home-screen widget with today's dose, your next test day and the days until your next clinic report, matching lock-screen widgets that never show the dose amount, and Siri requests to log today's dose or an INR reading, which the app asks you to confirm before anything is recorded. The lock-screen widgets and Siri requests need iOS 16 or later. Recording (weight and alcohol included), reminders, emailing a reading to your clinic, and full backup/restore are free, always.

Screenshots

Interval Timer4 screens
INR Tracker4 screens

Verdict

The call

The clearest difference is ads: INR Tracker at none against Interval Timer's shown. INR Tracker also leads on update cadence (daily vs every 9 days). Interval Timer's advantage is device support (4 vs 2) and iOS requirement (13.0 vs 15.0). On price and in-app purchases 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 6 in-app purchases, starting at $0.99 per month and INR Tracker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Interval Timer ships an update every 9 days, INR Tracker daily. The most recent releases landed on October 15, 2026 and October 2, 2026 respectively.

Scorecard4 real differences · 6 level
Interval Timer versus INR Tracker: the parameters behind the verdict, then further details
ParameterInterval TimerINR Tracker
PriceFreeFree
Rating4.5 (19K ratings) — better—
Positive reviews72.9% of reviews—
Number of ratings19K — better—
Update frequencyEvery 9 daysDaily — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone, iPod
Requires iOS13.0 — better15.0
Further details — not scored
Size143 MB38 MB
Age rating4+17+
DeveloperNEO PIXEL LABS PTE. LTD.STEFAN TULAC

Bugs and requests

Interval Timer

Reported bugs

3 issues
  • Ads block functionality
  • App freezes or crashes
  • Timer doesn't work in background

Requested features

5 requests
  • Add notes to workouts
  • Provide workout history and analytics
  • Allow syncing with Apple Health
  • Improve Apple Watch integration
  • Add more customization options

INR Tracker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

6 purchases

Interval Timer

Subscriptions6
  • Plus - 1 Month$0.991 Month
  • Premium - 1 Month$1.991 Month
  • Plus - 1 Month$1.991 Month
Show 3 more
  • Premium - 1 Month$2.991 Month
  • Plus - 1 Year2 variants$4.991 Year
  • Premium - 1 Year7 Days trial2 variants$9.991 Year
1 purchases

INR Tracker

One-time1
  • Five more charts, clinic PDF$4.99

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is INR Tracker free?
INR Tracker is free to download, with in-app purchases available.
Do Interval Timer or INR Tracker have ads?
Interval Timer shows ads; INR Tracker does not.
Which is updated more often, Interval Timer or INR Tracker?
Interval Timer ships an update every 9 days, and INR Tracker daily. Most recently, Interval Timer was updated on October 15, 2026 and INR Tracker on October 2, 2026.

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