Comparison

World Clock Time Zones Pro vs Onetime.

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

Head to head
About

World Clock Time Zones Pro

This intuitive world clock helps you coordinate with people across different time zones. Easily plan meetings, stay connected with loved ones, and manage global teams. It offers a unique visual display and time shifting capabilities for effortless time management.

Highlights
  • Unique intuitive display
  • Time shifting for time changes
  • Meeting scheduling
  • Global team management
  • Travel time forecasting
  • Event reminders and notifications
Features
Read full description

Coordinate with anyone, any time, anywhere, around the world with this unique and intuitive world clock. SYNC TEAMS - schedule overlap feature makes it easy to see when everyone's schedule coincides. KEEP IN TOUCH - Stay connected to family around the globe - know when it's the best time to call your relatives in another time zone. GREAT FOR TRAVEL - Plan your travel - use it to forecast your landing time after a long flight thru multiple time zones. GLOBAL SPORTS MATCHES - Don't miss the opening kick-off of the match in Manchester. TRADING MARKETS - Stay on top of the financial markets around the world. Features • Unique Intuitive Display - Super easy to see the times around the world • Time Shifting: Rotate the clock forwards or backwards to see time changes. • Large Widget - see the full clock face right on your home screen. • Schedule Overlap - see hours of overlap for schedules in one or more locations. • Reminders: Creates notifications for any time, any place.

About

Onetime.

Visualize multiple world time zones on a single, intuitive dial. This app simplifies international scheduling and communication by displaying cities as they move through day and night, automatically handling daylight saving changes. Effortlessly find the perfect time for calls or to connect with loved ones globally.

Highlights
  • Single, easy-to-read time zone dial
  • Visualizes cities moving through day and night
  • Automatic daylight saving time adjustments
  • Timetravel™ feature for scheduling
  • Shareable time invites
Features
Read full description

One world. Onetime. Finally, a world clock that integrates all time zones into one easy-to-read dial. We are all living and working globally more and more, so we needed a way to simply see the time in cities around the world at a glance. That’s how Onetime was born. Built on the metaphor of the earth’s rotation, Onetime displays all the cities that matter to you as they move through the day and night in a natural, clockwise direction referencing the international date line. Whether you are scheduling an international call or checking to see what time it is back home, Onetime is the clock for you. No more mistakes adding and subtracting hours, no more confusing GMT numbers, no more remembering daylight savings calendars. Onetime takes care of it all, automatically. And with Timetravel™, you can fly through time so that you quickly find the right moment to schedule that important teleconference with your international colleagues or catch your loved ones before their bedtimes. The „Share“ feature lets you choose a date with TimeTravel and send an invite via message or email. Give up your wall of newsroom clocks and switch to Onetime today. Onetime. By FLUID. ABOUT FLUID Onetime was created by the award-winning design firm FLUID. With our locations in Munich and Silicon Valley and our international client base, the FLUID team is a heavy Onetime user, too.

Screenshots

World Clock Time Zones Pro4 screens
Onetime.4 screens

Verdict

The call

The clearest difference is price: Onetime. at Free against World Clock Time Zones Pro's $3.99. Onetime. also leads on iOS requirement (13.0 vs 18.0). World Clock Time Zones Pro's advantage is review sentiment (94% vs 51%) and rating (4.7 vs 3.5). On ads, in-app purchases, monetization model 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

Onetime. is free to download; World Clock Time Zones Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

World Clock Time Zones Pro holds the better App Store score, 4.7 against 3.5. Both are backed by a comparable volume of ratings — 151 and 39 respectively. Written reviews point the same way: 94% of World Clock Time Zones Pro's written reviews are positive against 51% of Onetime.'s.

UpkeepUpdate frequency

World Clock Time Zones Pro ships an update every 3 weeks, Onetime. every 11 months. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

Scorecard6 real differences · 4 level
World Clock Time Zones Pro versus Onetime.: the parameters behind the verdict, then further details
ParameterWorld Clock Time Zones ProOnetime.
Price$3.99Free — better
Rating4.7 (151 ratings) — better3.5 (39 ratings)
Positive reviews94.1% of reviews — better51.5% of reviews
Number of ratings151 — better39
Update frequencyEvery 3 weeks — betterEvery 11 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPadiPhone, iPod
Requires iOS18.013.0 — better
Further details — not scored
Size19 MB2 MB
Age rating4+4+
DeveloperDavid RichmondFLUID Design GmbH

Customer experience

World Clock Time Zones Pro

All ratings151 ratings
Positive93.4%
Neutral3.3%
Negative3.3%
Written reviews51 reviews
Positive94.1%
Neutral2.0%
Negative3.9%

Onetime.

All ratings39 ratings
Positive59.0%
Neutral2.6%
Negative38.5%
Written reviews134 reviews
Positive51.5%
Neutral5.2%
Negative43.3%

Bugs and requests

World Clock Time Zones Pro

Not enough reviews yet to summarise bugs or requests.

Onetime.

Reported bugs

8 issues
  • Incorrect time zone data for some cities (e.g., Taipei, São Paulo)
  • App freezes when trying to add cities
  • City search function not working ('No cities found')
  • App crashes on launch after updates
  • Time travel feature stops working with certain cities
Show 3 more
  • Scrolling back and forth in time no longer possible
  • App not working with latest iOS versions
  • Default 'My Time' zone cannot be removed

Requested features

9 requests
  • Ability to add descriptive labels for cities
  • Ability to add GMT/UTC time
  • Ability to add time zones manually
  • Homescreen widgets
  • Ability to toggle cities instead of removing
Show 4 more
  • iPad version
  • Tutorial on first launch
  • Option to reverse view horizontally
  • Ability to search future dates

In-app purchases

None

World Clock Time Zones Pro

No in-app purchases

None

Onetime.

No in-app purchases

Questions

Is World Clock Time Zones Pro free?
World Clock Time Zones Pro costs $3.99, with no in-app purchases.
Is Onetime. free?
Onetime. is free to download, with no in-app purchases.
Which has better reviews, World Clock Time Zones Pro or Onetime.?
World Clock Time Zones Pro is rated higher. World Clock Time Zones Pro averages 4.7 out of 5 from 151 ratings, while Onetime. averages 3.5 from 39 ratings.
Do World Clock Time Zones Pro or Onetime. have ads?
Neither World Clock Time Zones Pro nor Onetime. shows ads.
Which is updated more often, World Clock Time Zones Pro or Onetime.?
World Clock Time Zones Pro ships an update every 3 weeks, and Onetime. every 11 months. Most recently, World Clock Time Zones Pro was updated on September 19, 2026 and Onetime. on September 17, 2026.

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