Comparison

Date and Time Calculator Pro vs Overlap

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

Head to head
About

Date and Time Calculator Pro

Calculate the precise time difference between any two dates and times, down to the second. Easily determine future or past dates based on a specified duration. Ideal for tracking events, financial periods, or personal milestones.

Highlights
  • Calculate time distance between dates
  • Calculate days after a specific date
  • Calculate date before a specific date
  • Second-level precision
  • Period time calculation
Read full description

Want to know how many days you can receive the Christmas gift? Want to know how many days you will have the college entrance exam?Want to know how many days the 158-day wealth management product expired? This tool helps you to calculate the distance between any time, down to second. It can also calculate the day after that day between any time. This tool is not only for wealth management but also for period time. It can tell you the date before or after a certain period.

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

Date and Time Calculator Pro3 screens
Overlap4 screens

Verdict

The call

The clearest difference is price: Overlap at Free against Date and Time Calculator Pro's $0.99. Overlap also leads on device support (4 vs 2). Date and Time Calculator Pro's advantage is review sentiment (89% vs 67%) and update cadence (every 5 weeks vs every 3 months). On rating, ratings volume, ads 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

Overlap is free to download; Date and Time Calculator Pro costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Date and Time Calculator Pro against 4.8 for Overlap. Both are backed by a comparable volume of ratings — 963 and 881 respectively. Written reviews are what separate them: 89% of Date and Time Calculator Pro's written reviews are positive against 67% of Overlap's.

UpkeepUpdate frequency

Date and Time Calculator Pro ships an update every 5 weeks, Overlap every 3 months. The most recent releases landed on November 10, 2026 and November 11, 2026 respectively.

Scorecard4 real differences · 6 level
Date and Time Calculator Pro versus Overlap: the parameters behind the verdict, then further details
ParameterDate and Time Calculator ProOverlap
Price$0.99Free — better
Rating4.8 (963 ratings) — better4.8 (881 ratings)
Positive reviews88.9% of reviews — better67.3% of reviews
Number of ratings963 — better881
Update frequencyEvery 5 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.015.0
Further details — not scored
Size3 MB71 MB
Age rating4+4+
Developer山 钟Bonobo

Customer experience

Date and Time Calculator Pro

All ratings947 ratings
Positive96.7%
Neutral2.0%
Negative1.3%
Written reviews153 reviews
Positive88.9%
Neutral3.9%
Negative7.2%

Overlap

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

User reviews

Date and Time Calculator Pro

From 963 App Store ratings

What we love

  • 👍 Extremely useful
  • 👍 Great app
  • 👍 Excellent tool
  • 👍 Useful
  • 👍 Perfect app

Room to improve

  • 🐛 Ads even after buying
  • 🐛 Paid for app but still has ads
  • 🐛 Pro version has ads
  • 🐛 Can't reinstall my purchased app

Overlap

From 881 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

Date and Time Calculator Pro

Reported bugs

3 issues
  • Paid version has lost the ability to calculate future dates based on weeks
  • Date selection uses a scroll wheel instead of keypad entry
  • Unable to copy or share calculation results

Requested features

5 requests
  • Add ability to change year for date time calculation
  • Implement dark mode
  • Add iPad version
  • Add divide option in time calculator
  • Add ability to calculate working days

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

Date and Time Calculator Pro

No in-app purchases

None

Overlap

No in-app purchases

Questions

Is Date and Time Calculator Pro free?
Date and Time Calculator Pro costs $0.99, with no in-app purchases.
Is Overlap free?
Overlap is free to download, with no in-app purchases.
Which has better reviews, Date and Time Calculator Pro or Overlap?
Date and Time Calculator Pro is rated higher. Date and Time Calculator Pro averages 4.8 out of 5 from 963 ratings, while Overlap averages 4.8 from 881 ratings.
Do Date and Time Calculator Pro or Overlap have ads?
Neither Date and Time Calculator Pro nor Overlap shows ads.
Which is updated more often, Date and Time Calculator Pro or Overlap?
Date and Time Calculator Pro ships an update every 5 weeks, and Overlap every 3 months. Most recently, Date and Time Calculator Pro was updated on November 10, 2026 and Overlap on November 11, 2026.

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