Comparison

Overlap vs Birthday Countdown

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

Head to head
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!

About

Birthday Countdown

Never miss a special occasion with this birthday reminder and countdown app. Easily import contacts, track upcoming events, and receive personalized alerts. It offers gift suggestions and instant ways to send greetings, all within a privacy-focused design.

Highlights
  • Effortless birthday tracking
  • Countdown timer to events
  • Import birthdays from contacts
  • Personalized birthday profiles
  • Gift suggestions
  • Instant birthday wishes
  • iCloud sync
Features
Read full description

Never miss a special day again. CandlesUp is your all-in-one birthday reminder, countdown widget, and calendar tracker. Import birthdays from contacts or calendars and get smart reminders with birthday wishes. Key Features - Effortless Tracking – Manually add birthdays or import them directly from your contacts. - Countdown Timer – See the exact time left until upcoming birthdays. - Personalized Experience – Set up your own birthday profile and track your countdown. - Rich Details – View age, Western & Chinese zodiac signs, and more. - Quick Actions – Manage contacts, notifications, and calendar views with a single tap. - Insights - Get to know you friends and their bday analytics - iCloud Sync – Keep your birthdays, photos and notes up to date on all your iPhones and iPads. Just sign in to iCloud. Celebrate with Ease - Gift Suggestions – Get region-specific gift ideas tailored to your location. - Instant Birthday Wishes – Send greetings via WhatsApp, Messages, Email, or calls. - Calendar Integration – Add birthdays with automatic yearly recurrence. - Custom Alerts – Set personalized reminders so you never miss a special day. Privacy-Focused - Private by Design – Your birthdays, names and contacts stay on your device and, with iCloud sync, in your own private iCloud – never on our servers. - No Ads, No Selling – Only anonymous usage analytics and crash reports help us improve the app. - Full Control – Easily manage your data through a simple interface. Thoughtfully Designed - Modern Interface – Elegant animations and smooth navigation. - Dark Mode Support – Comfortable viewing in any lighting condition. - Accessibility – Designed to work seamlessly for all users. Download CandlesUp today and make every birthday unforgettable. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Overlap4 screens
Birthday Countdown4 screens

Verdict

The call

The clearest difference is in-app purchases: Overlap at none against Birthday Countdown's 6. Overlap also leads on device support (4 vs 2) and iOS requirement (15.0 vs 18.0). Birthday Countdown's advantage is update cadence (every 6 days vs every 3 months) and review sentiment (91% vs 67%). On price, rating, ratings volume and ads 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. Birthday Countdown sells 6 in-app purchases, starting at $4.99 per 7 days. Overlap asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Overlap against 4.7 for Birthday Countdown. Both are backed by a comparable volume of ratings — 880 and 698 respectively. Written reviews are what separate them: 67% of Overlap's written reviews are positive against 91% of Birthday Countdown's.

UpkeepUpdate frequency

Overlap ships an update every 3 months, Birthday Countdown every 6 days. The most recent releases landed on November 7, 2026 and November 5, 2026 respectively.

Scorecard6 real differences · 4 level
Overlap versus Birthday Countdown: the parameters behind the verdict, then further details
ParameterOverlapBirthday Countdown
PriceFreeFree
Rating4.8 (880 ratings) — better4.7 (698 ratings)
Positive reviews67.3% of reviews91.1% of reviews — better
Number of ratings880 — better698
Update frequencyEvery 3 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size71 MB76 MB
Age rating4+4+
DeveloperBonoboAnton Pustovidko

Customer experience

Overlap

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

Birthday Countdown

All ratings698 ratings
Positive92.1%
Neutral3.6%
Negative4.3%
Written reviews45 reviews
Positive91.1%
Neutral2.2%
Negative6.7%

User reviews

Overlap

From 880 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

Birthday Countdown

From 698 App Store ratings

What we love

  • 👍 Helpful for remembering birthdays
  • 👍 Imports contacts easily
  • 👍 Satisfying countdown view
  • 👍 Useful widget
  • 👍 Lightweight app

Room to improve

  • 💰 Constant push for premium
  • 💰 Premium required for basic functions
  • 💰 Payment for yearly use is excessive
  • 💰 Too many premium features
  • 💰 Annoying in-app purchases

Bugs and 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

Birthday Countdown

Reported bugs

4 issues
  • Bug preventing interaction without premium purchase
  • Cannot exit premium page
  • Friend's zodiac sign is incorrect
  • Bug preventing birthday change initially

Requested features

12 requests
  • Allow adding children with gift wish lists
  • Save gift ideas per person
  • AI text generation for birthday messages
  • Ability to set more than five notifications per birthday
  • See zodiac sign without premium
Show 7 more
  • Include phone number from contacts automatically
  • See other people's birthday time to the second
  • Add a function to include phone number from contacts
  • AI to type out a text that you could send that person on their birthday
  • Save gift ideas to each person
  • Set a minimum of five notifications per birthday
  • See stuff like my zodiac sign, etc.

In-app purchases

None

Overlap

No in-app purchases

6 purchases

Birthday Countdown

Subscriptions4
  • Weekly3 Days trial$4.997 Days
  • Weekly$4.997 Days
  • Unlimited Yearly$9.991 Year
Show 1 more
  • Unlimited Access3 Days trial$29.991 Year
One-time2
  • Unlimited Access$29.99
  • Unlimited Access$59.99

Questions

Is Overlap free?
Overlap is free to download, with no in-app purchases.
Is Birthday Countdown free?
Birthday Countdown is free to download, with in-app purchases available.
Which has better reviews, Overlap or Birthday Countdown?
Overlap is rated higher. Overlap averages 4.8 out of 5 from 880 ratings, while Birthday Countdown averages 4.7 from 698 ratings.
Do Overlap or Birthday Countdown have ads?
Neither Overlap nor Birthday Countdown shows ads.
Which is updated more often, Overlap or Birthday Countdown?
Overlap ships an update every 3 months, and Birthday Countdown every 6 days. Most recently, Overlap was updated on November 7, 2026 and Birthday Countdown on November 5, 2026.

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