Comparison

iBigCalc vs Countdown Days

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

Head to head
About

iBigCalc

Features
Read full description

Elevate your daily calculations with the Simple and Smart Calculator. Designed for those who value efficiency and clarity, our app provides a seamless experience for all your mathematical needs. Whether youโ€™re a student, professional, or just need to split a bill, our intuitive interface ensures you get accurate results instantly without any unnecessary clutter. Key Features: + Clean UI: A minimalist design that stays out of your way. + Smart History: Easily track and reuse your previous calculations. + Precision & Speed: Fast processing for both basic and complex math. Simple to use, smart in performance. Download now and make math effortless!

About

Countdown Days

Features
Read full description

Countdown Days: Events & Widgets Every day brings you closer to something worth celebrating. Countdown Days helps you make every moment count with reminders, widgets, and beautiful customization. From birthdays and anniversaries to vacations, exams, project deadlines, and life's biggest milestones, create beautiful events, organize them with sub-events, and track every countdown in one easy-to-manage place. Keep every important moment beautifully organized and always within reach. Powerful Countdown Features - Count down to any future date or count up from past events - View days remaining or days elapsed at a glance - Add an optional end date for events with a duration - Organize related events with sub-events for easier management - Repeat events every N days, weeks, months, or years - Receive reminders on the event day, 1 day before, or 1 week before - Add beautiful Home Screen widgets in multiple styles - Customize event icons, colors, and title highlights - Protect private categories with Face ID or Touch ID - Enjoy a clean, distraction-free experience with no ads Perfect For - Birthdays - Anniversaries - Weddings - Vacations - Holidays - Exams - Project deadlines - Retirement - Baby due dates - Sporting events - Concerts - Flights - Personal goals - Every moment worth celebrating Designed for People Around the World Countdown Days supports multiple calendar systems, making it easy to track important dates wherever you live. Supported calendars include: - Gregorian - Chinese Lunar - Islamic - Indian - Buddhist - Japanese - Hebrew Smart Time Zone Support Choose how countdowns handle time zones. Keep events fixed to their original time zone, or automatically adapt them to your current location, making Countdown Days perfect for everything from international flights to local celebrations. Unlock Even More with Pro Some advanced features require Countdown Days Pro, including cloud sync, additional customization options, and more. Download Countdown Days today and start looking forward to every special moment. Icon Credits: https://countdowndays.pages.dev/icon-credits Useful Links Privacy policy: https://countdowndays.pages.dev/privacy Terms of use: https://countdowndays.pages.dev/terms Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

iBigCalc4 screens
Countdown Days4 screens

Verdict

The call

The clearest difference is in-app purchases: iBigCalc at none against Countdown Days's 3. iBigCalc also leads on update cadence (every 3 weeks vs every 5 weeks). Countdown Days's advantage is ads (none vs shown) and iOS requirement (15.6 vs 17). On price and device support there is nothing between them.

Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Countdown Days sells 3 in-app purchases, starting at $1.29 per month. iBigCalc asks for nothing beyond the download.

UpkeepUpdate frequency

iBigCalc ships an update every 3 weeks, Countdown Days every 5 weeks. The most recent releases landed on October 16, 2026 and October 9, 2026 respectively.

Scorecard4 real differences ยท 2 level
iBigCalc versus Countdown Days: the parameters behind the verdict, then further details
ParameteriBigCalcCountdown Days
PriceFreeFree
Update frequencyEvery 3 weeks โ€” betterEvery 5 weeks
AdsYesNo โ€” better
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPadiPhone, iPad, iPod โ€” better
Requires iOS1715.6 โ€” better
Further details โ€” not scored
Size5 MB45 MB
Age rating4+4+
DeveloperManh Phi Nguyen้•ฟๅฎ ไพฏ

In-app purchases

None

iBigCalc

No in-app purchases

3 purchases

Countdown Days

Subscriptions2
  • Pro (Monthly)$1.291 Month
  • Pro (Yearly)3 Days trial$9.991 Year
One-time1
  • Pro (Lifetime)$24.99

Questions

Is iBigCalc free?
iBigCalc is free to download, with no in-app purchases.
Is Countdown Days free?
Countdown Days is free to download, with in-app purchases available.
Do iBigCalc or Countdown Days have ads?
iBigCalc shows ads; Countdown Days does not.
Which is updated more often, iBigCalc or Countdown Days?
iBigCalc ships an update every 3 weeks, and Countdown Days every 5 weeks. Most recently, iBigCalc was updated on October 16, 2026 and Countdown Days on October 9, 2026.

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