Comparison

IntervalTimer vs Contraction Timer

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

Head to head
About

IntervalTimer

Features
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A powerful app to create and start interval timers that repeat exercise and rest periods. Perfect for weight training, stretching, Pomodoro timers, and many other activities. Packed with features including unlimited tabs, custom durations, one-tap start and stop, dark mode, biometric authentication, and more. โ–  Create Interval Timers Create and start timers with your preferred number of sets and durations. โ–  Organize Timers by Tab Create your own timers for each category with unlimited tabs. โ–  Set Counts, Preparation, Workout, and Rest Freely configure repeat counts and durations, then start right away. โ–  No Login Required Use it immediately without logging in. โ–  Back and Forward Buttons Go back one step or skip ahead with a single tap. โ–  Swipe to Switch Tabs Swipe left or right to switch tabs and start your timer instantly. โ–  Reorder Tabs Rearrange tabs by swiping. โ–  Custom Background Colors per Tab Change the background color for each tab individually. โ–  Backup and Restore Save your data permanently to the cloud and restore it instantly on a new device. โ–  Dark Mode Work comfortably with a beautiful dark mode that is easy on the eyes. โ–  Biometric Authentication Enhance app security with biometric authentication. โ–  Tab Notes Leave your favorite notes on tabs. โ–  Complete Security Data is never sent externally and is completely protected within your device. โ–  Offline Support Works even without an internet connection. โ–  Terms of Use https://naokiotsu.com/term-of-use โ–  Privacy Policy https://naokiotsu.com/privacy-policy Support info@naokiotsu.com

About

Contraction Timer

Features
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Bumpy is a calm, clutter-free pregnancy companion built around the one tool you will reach for most: a clean, reliable contraction timer. No ads getting in the way, no account to create, and everything you track stays private on your iPhone. THE CONTRACTION TIMER IS ALWAYS FREE When things get real, you should not be fighting a paywall. Bumpy's contraction timer is free, forever. Tap once when a contraction starts and again when it ends. Bumpy logs the length and the interval, shows your averages over the last hour, and gently surfaces when your pattern resembles the widely-shared 5-1-1 guideline, as general information. ALSO FREE - Kick counter with a simple count-to-ten session and history - Due-date countdown with your current week and progress CYCLE & FERTILITY MODE, FROM CYCLE TO BUMP Not pregnant yet? Choose "Tracking my cycle" and Bumpy becomes a private period tracker. Log your period start and end and your flow, and see your predicted next period, fertile window and estimated ovulation day on a clean monthly calendar. Add symptoms, mood and notes for any day. Predictions use the average of your own logged cycle lengths (28 days until you have logged two cycles), with ovulation estimated 14 days before your next period, and the app explains how each estimate is made, with links to public health sources. When you become pregnant, switch modes in Settings and Bumpy can suggest a due date 280 days after your last period start. Period logging and the calendar are free. PREMIUM ADDS THE FULL COMPANION - Weekly guide: your baby's size and development, week by week - Hospital bag checklist you can tick off - 260+ baby names with meanings and origins, plus favorites - Appointment log for checkups and scans - Weight log with your trend at a glance - Cycle insights: cycle-length history, period history and symptom patterns PRIVATE BY DESIGN No account. No ads. No tracking. Everything you enter is stored only on your device. We never see it and we never sell your data. GENERAL INFORMATION, NOT MEDICAL ADVICE Bumpy provides general information only and is not medical advice. Every pregnancy is different. Always contact your doctor or midwife with questions about labor, your health, or your baby. FREE AND PREMIUM The contraction timer, kick counter, due-date countdown, period logging and the cycle calendar are free with no limits. Premium unlocks the weekly guide, hospital bag checklist, baby names, the appointment and weight logs, and cycle insights. SUBSCRIPTION Bumpy Premium is available as a weekly subscription with a 3-day free trial, an annual subscription, or a one-time lifetime unlock. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions automatically renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel subscriptions in your Apple ID Account Settings. Restore purchases from the app settings. The lifetime option is a one-time purchase and does not renew. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://www.appharbour.com/bumpy/privacy.html

Screenshots

IntervalTimer4 screens
Contraction Timer4 screens

Verdict

The call

The clearest difference is update cadence: IntervalTimer at weekly against Contraction Timer's every 6 weeks. IntervalTimer also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). On price, ads and in-app purchases there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. IntervalTimer sells 1 one-off in-app purchase and Contraction Timer sells 3 in-app purchases, starting at $3.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

IntervalTimer ships an update weekly, Contraction Timer every 6 weeks. The most recent releases landed on October 25, 2026 and October 11, 2026 respectively.

Scorecard3 real differences ยท 3 level
IntervalTimer versus Contraction Timer: the parameters behind the verdict, then further details
ParameterIntervalTimerContraction Timer
PriceFreeFree
Update frequencyWeekly โ€” betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPod โ€” betteriPhone
Requires iOS15.1 โ€” better17.0
Further details โ€” not scored
Size52 MB1 MB
Age rating4+4+
Developernaoki otsuApp Harbour ApS

In-app purchases

1 purchases

IntervalTimer

One-time1
  • Premium (Pay Once)$4.99
3 purchases

Contraction Timer

Subscriptions2
  • Weekly Premium3 Days trial$3.997 Days
  • Annual Premium$19.991 Year
One-time1
  • Lifetime Unlock$29.99

Questions

Is IntervalTimer free?
IntervalTimer is free to download, with in-app purchases available.
Is Contraction Timer free?
Contraction Timer is free to download, with in-app purchases available.
Do IntervalTimer or Contraction Timer have ads?
Neither IntervalTimer nor Contraction Timer shows ads.
Which is updated more often, IntervalTimer or Contraction Timer?
IntervalTimer ships an update weekly, and Contraction Timer every 6 weeks. Most recently, IntervalTimer was updated on October 25, 2026 and Contraction Timer on October 11, 2026.

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