Comparison

24h World vs Overlap

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

Head to head
About

24h World

Easily track the time in three different cities simultaneously with this world clock application. It utilizes iOS time zones and allows you to select cities from a comprehensive list. You can also simulate past or future times using a slider.

Highlights
  • Display time for three cities
  • Utilizes iOS time zones
  • Select cities from a time zone list
  • Simulate past/future time with slider
Features
Read full description

This clock is the world clock of the indication for 24 hours. This clock can display the time of three cities at same time. This clock uses the time zone of iOS. ---select cities--- Tapping the "Where?" button Choosing three cities from time zone list Time zone list Continent / Region / City or Continent / City ---simulating time--- Changing time to use the slider for past or future .

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

24h World4 screens
Overlap4 screens

Verdict

The call

The clearest difference is review sentiment: Overlap at 67% against 24h World's 0%. Overlap also leads on rating (4.8 vs 2.4) and ratings volume (871 vs 5). 24h World's advantage is update cadence (every 6 weeks vs every 3 months) and iOS requirement (6.0 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 2.4. That said, the two scores are not equally well evidenced: Overlap has 871 ratings behind it against 5, so its average is the more settled of the two. Written reviews point the same way: 0% of 24h World's written reviews are positive against 67% of Overlap's.

UpkeepUpdate frequency

24h World ships an update every 6 weeks, Overlap every 3 months. The most recent releases landed on October 16, 2026 and October 22, 2026 respectively.

Scorecard6 real differences · 4 level
24h World versus Overlap: the parameters behind the verdict, then further details
Parameter24h WorldOverlap
PriceFreeFree
Rating2.4 (5 ratings)4.8 (871 ratings) — better
Positive reviews0.0% of reviews67.3% of reviews — better
Number of ratings5871 — better
Update frequencyEvery 6 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS6.0 — better15.0
Further details — not scored
Size1 MB71 MB
Age rating4+4+
DeveloperSakura appsBonobo

Customer experience

24h World

All ratings5 ratings
Positive20.0%
Neutral20.0%
Negative60.0%
Written reviews5 reviews
Positive0.0%
Neutral20.0%
Negative80.0%

Overlap

All ratings849 ratings
Positive95.5%
Neutral2.4%
Negative2.1%
Written reviews248 reviews
Positive67.3%
Neutral11.3%
Negative21.4%

Bugs and requests

24h World

Not enough reviews yet to summarise bugs or requests.

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

24h World

No in-app purchases

None

Overlap

No in-app purchases

Questions

Is 24h World free?
24h World 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, 24h World or Overlap?
Overlap is rated higher. 24h World averages 2.4 out of 5 from 5 ratings, while Overlap averages 4.8 from 871 ratings.
Do 24h World or Overlap have ads?
Neither 24h World nor Overlap shows ads.
Which is updated more often, 24h World or Overlap?
24h World ships an update every 6 weeks, and Overlap every 3 months. Most recently, 24h World was updated on October 16, 2026 and Overlap on October 22, 2026.

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