Comparison

Interval Timer vs FlexChallenge

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

FlexChallenge

Read full description

Most goals don't fail from lack of motivation. They fail because there's no structure. FlexChallenge gives any goal a start date, an end date, and a daily checklist — then holds you to it. Create a custom challenge for anything: fitness, reading, meditation, learning a skill, breaking a bad habit, or a structured program like 75 Hard. Pick your duration, pick your daily tasks, and show up. YOUR CHALLENGE, YOUR RULES • Any goal, any habit — you define what counts • 7 to 365 days, you set the finish line • Strict mode (miss a day, start over) or flexible mode — your call • Run multiple challenges at once TASK TYPES THAT FIT REAL LIFE • Checkboxes for simple daily habits • Counters for quantities — pages read, reps done, minutes practiced • Timed tasks for focused sessions • Water tracking with one-tap quick add • Automatic step counting via Apple Health SEE YOUR PROGRESS EVERYWHERE • Visual calendar that shows your streak at a glance • Home screen widgets so your challenge stays in front of you • Stats and charts that prove you're changing • Progress photos and voice notes to document the journey • Daily reminders so no day slips by FLEXCHALLENGE PRO Start with a 14-day free trial. Then $24.99/year or $3.99/month, billed through the App Store. Cancel anytime. Terms of Use: https://flexchallenge.app/terms Privacy Policy: https://flexchallenge.app/privacy PRIVATE BY DESIGN No account. No feed. No social pressure. Everything stays on your device — it's just you and your goals. Whether you're building a morning routine, training for something big, or finally finishing what you start: the challenge starts the day you create it. Start today. Stay consistent. Become who you want to be.

Screenshots

Interval Timer4 screens
FlexChallenge4 screens

Verdict

The call

The clearest difference is ads: FlexChallenge at none against Interval Timer's shown. Interval Timer's advantage is device support (4 vs 1) and iOS requirement (13.0 vs 17.6). On price, update cadence 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 FlexChallenge sells 2 in-app purchases, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Interval Timer ships an update every 9 days, FlexChallenge every 6 days. The most recent releases landed on November 5, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
Interval Timer versus FlexChallenge: the parameters behind the verdict, then further details
ParameterInterval TimerFlexChallenge
PriceFreeFree
Rating4.5 (19K ratings) — better—
Positive reviews72.9% of reviews—
Number of ratings19K — better—
Update frequencyEvery 9 daysEvery 6 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone
Requires iOS13.0 — better17.6
Further details — not scored
Size143 MB17 MB
Age rating4+4+
DeveloperNEO PIXEL LABS PTE. LTD.Local Wave Studios LLC

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

FlexChallenge

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
2 purchases

FlexChallenge

Subscriptions2
  • FlexChallenge Pro Monthly14 Days trial$3.991 Month
  • FlexChallenge Pro Yearly14 Days trial$24.991 Year

Questions

Is Interval Timer free?
Interval Timer is free to download, with in-app purchases available.
Is FlexChallenge free?
FlexChallenge is free to download, with in-app purchases available.
Do Interval Timer or FlexChallenge have ads?
Interval Timer shows ads; FlexChallenge does not.
Which is updated more often, Interval Timer or FlexChallenge?
Interval Timer ships an update every 9 days, and FlexChallenge every 6 days. Most recently, Interval Timer was updated on November 5, 2026 and FlexChallenge on October 28, 2026.

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