Comparison

OneTime vs Calume

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

Head to head
About

OneTime

Features
Read full description

OneTime is a time-tracking stopwatch for recording time and organizing your day. Start with one tap, and your records flow into a timeline, calendar, and stats. You can track study, work, exercise, reading, and daily activities. See how much you did each day and review weekly and monthly patterns. What you can do with OneTime โ€ข Timeline See your activities in chronological order throughout the day. โ€ข Calendar Review your records by date and check any day you want. โ€ข Stats See how you spend your time with weekly and monthly patterns. โ€ข Time tracking Use a stopwatch that tracks one activity at a time. โ€ข Manual entries and edits Add missed time later, edit existing records, and leave notes. โ€ข Automatic tracking by app Track time automatically based on selected apps. โ€ข Routines and checklists Organize recurring items and manage date-based checklists. You can add items, reorder them, and carry unfinished items over to the next day. Missed a record? No problem. You can add or edit it later. OneTime is built not just for measuring time, but for reviewing and organizing your records. If you want time tracking, timeline, calendar, and stats in one app, OneTime fits. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Calume

Features
Read full description

Calume โ€” a time tracking app for people who treat time as a resource. Track every hour with a single tap. See your full day on one timeline. Get honest reports. Built for focus, designed with care. Calume requires a Calume Pro subscription for access. Start with a 7-day free trial; you can cancel anytime. Start a timer with one tap โ€” stopwatch or countdown, your call. Every session lands on your day timeline the moment you stop, building a complete picture of how you spend your time. Plan your day with tasks, attach timers, and watch your schedule unfold in real time. Calume keeps your intentions and your reality side by side so you can see where time actually goes. Track any activity โ€” work, focus, sleep, rest, reading, exercise, creative time, or anything else that matters to you. Assign colors to categories and your timeline becomes instantly readable at a glance. Weekly and monthly reports show hours per activity with clear, honest numbers. Set goals and see your progress day by day. No gamification, no streaks โ€” just the data you need to make better decisions about your time. Calume syncs with Apple Health and your calendar to fill in context automatically. Privacy Policy: https://calume.app/privacy Terms of Use: https://calume.app/terms

Screenshots

OneTime4 screens
Calume4 screens

Verdict

The call

The clearest difference is ads: Calume at none against OneTime's shown. On price, update cadence, in-app purchases and device support 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. OneTime sells 4 in-app purchases, starting at $0.99 per month and Calume sells 3 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

OneTime ships an update weekly, Calume fortnightly. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

Scorecard1 real difference ยท 5 level
OneTime versus Calume: the parameters behind the verdict, then further details
ParameterOneTimeCalume
PriceFreeFree
Update frequencyWeekly โ€” betterFortnightly
AdsYesNo โ€” better
In-app purchasesYesYes
DevicesiPhone, iPadiPhone, iPad
Requires iOS18.017.0 โ€” better
Further details โ€” not scored
Size65 MB23 MB
Age rating4+4+
DeveloperUNCHAN BAEKDANIEL HAVLAS

In-app purchases

4 purchases

OneTime

Subscriptions2
  • Launch Monthly$0.991 Month
  • Monthly7 Days trial$1.991 Month
One-time2
  • Token Bundle$0.99
  • Lifetime$11.99
3 purchases

Calume

Subscriptions3
  • Chronicle Pro Monthly$8.991 Month
  • Chronicle Pro Yearly7 Days trial$19.991 Year
  • Chronicle Pro Yearly7 Days trial$34.991 Year

Questions

Is OneTime free?
OneTime is free to download, with in-app purchases available.
Is Calume free?
Calume is free to download, with in-app purchases available.
Do OneTime or Calume have ads?
OneTime shows ads; Calume does not.
Which is updated more often, OneTime or Calume?
OneTime ships an update weekly, and Calume fortnightly. Most recently, OneTime was updated on October 16, 2026 and Calume on October 9, 2026.

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