Comparison

Onetime. vs Overlap

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

Head to head
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.

About

Overlap

Easily find optimal meeting times across different time zones with a visual graph. Set custom availability for each location and sync with your calendar to avoid scheduling conflicts. Share convenient times directly from the app.

Highlights
  • Visual Overlap Graph for meeting times
  • Customizable availability hours per time zone
  • Calendar event integration
  • Multiple time zone display
  • Time zone renaming
  • Lock Screen Standby Mode widget
Features
Read full description

Find the perfect time to catchup across multiple time zones without the mind-bending math. Overlap is a smart world clock that helps you connect with people in different time zones. It makes it simple to see the time in multiple places at once, and its fun Overlap Graph is a unique visual way to quickly find convenient meeting times across the world. You can choose ‘available’ hours for each time zone. For example Dan in London might be available from 2pm to 5pm and Rashida in Sydney might be available from 7am to midday. Bring up the Overlap Graph and it will magically show you the most compatible times to schedule your catchup. Overlap also displays your calendar events, so you can always find a time that suits your schedule. Available on iPhone, iPad and Mac. • You can see multiple time zones in one beautiful UI • You can swipe left and right to quickly move through time. • You can customize 'availability' for each timezone - this could mean office hours for a meeting or simply when you're available for a group chat with your far-flung family -no more 'Sorry that's 3am for me!' • You can rename each time zone; for example, you might simply rename a time zone to say 'Grandma' or the name of a client you work with. Or perhaps your Grandma is your client, no judgement here. • You can hide time zones that you don’t need right now so it’s always easy to focus on what you need to know. • You can show your calendar events so you can always choose a time that fits your schedule. • Once you’ve chosen a great time its easy to share it via your favorite messaging app or create a calendar event. • Standby Mode is a Lock Screen feature that activates automatically when your iPhone is charging in landscape mode. The Overlap widget fully supports this mode!

Screenshots

Onetime.4 screens
Overlap4 screens

Verdict

The call

The clearest difference is rating: Overlap at 4.8 against Onetime.'s 3.5. Overlap also leads on update cadence (every 3 months vs every 11 months) and ratings volume (849 vs 39). Onetime.'s advantage is iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and monetization model 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. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Overlap holds the better App Store score, 4.8 against 3.5. That said, the two scores are not equally well evidenced: Overlap has 849 ratings behind it against 39, so its average is the more settled of the two. Written reviews point the same way: 51% of Onetime.'s written reviews are positive against 67% of Overlap's.

UpkeepUpdate frequency

Onetime. ships an update every 11 months, Overlap every 3 months. The most recent releases landed on September 17, 2026 and September 24, 2026 respectively.

Scorecard6 real differences · 4 level
Onetime. versus Overlap: the parameters behind the verdict, then further details
ParameterOnetime.Overlap
PriceFreeFree
Rating3.5 (39 ratings)4.8 (849 ratings) — better
Positive reviews51.5% of reviews67.2% of reviews — better
Number of ratings39849 — better
Update frequencyEvery 11 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS13.0 — better15.0
Further details — not scored
Size2 MB71 MB
Age rating4+4+
DeveloperFLUID Design GmbHBonobo

Customer experience

Onetime.

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

Overlap

All ratings849 ratings
Positive95.5%
Neutral2.4%
Negative2.1%
Written reviews247 reviews
Positive67.2%
Neutral11.3%
Negative21.5%

User reviews

Onetime.

From 39 App Store ratings

What we love

  • ✨ Beautiful and elegant design
  • 👍 Intuitive and easy to use interface
  • 🌍 Great for visualizing time differences
  • 💡 Unique and innovative visualization
  • ✅ Works well for scheduling

Room to improve

  • 🐛 Data quality issues (incorrect times)
  • 🐛 Inability to add cities
  • 🐛 App crashes or freezes
  • 🐛 City search not working
  • 🐛 Some cities not recognized

Overlap

From 849 App Store ratings

What we love

  • 💡 Elegant and intuitive interface
  • 🚀 Helpful for coordinating meetings across time zones
  • 👍 Useful for tracking time differences globally
  • 👍 Simple and easy to use
  • 👍 Beautiful and sleek design

Room to improve

  • 🐛 Widget not working
  • 🐛 Timezone data not always accurate
  • 🐛 Duplicate timezone entries
  • 🐛 App crashes and freezes
  • 🔋 High CPU usage on Mac

Bugs and 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

Overlap

Reported bugs

4 issues
  • Timezone data not updating correctly
  • Inability to delete unwanted timezones
  • Inconsistent behavior across platforms
  • Typing issues on Mac version

Requested features

5 requests
  • Add option to reorder timezones
  • Implement 24-hour clock display
  • Allow customization of colors and backgrounds
  • Integrate with calendar for scheduling
  • Add weather information for each timezone

In-app purchases

None

Onetime.

No in-app purchases

None

Overlap

No in-app purchases

Questions

Is Onetime. free?
Onetime. is free to download, with no in-app purchases.
Is Overlap free?
Overlap is free to download, with no in-app purchases.
Which has better reviews, Onetime. or Overlap?
Overlap is rated higher. Onetime. averages 3.5 out of 5 from 39 ratings, while Overlap averages 4.8 from 849 ratings.
Do Onetime. or Overlap have ads?
Neither Onetime. nor Overlap shows ads.
Which is updated more often, Onetime. or Overlap?
Onetime. ships an update every 11 months, and Overlap every 3 months. Most recently, Onetime. was updated on September 17, 2026 and Overlap on September 24, 2026.

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