Comparison

Gradation Calculator 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

Gradation Calculator

Features
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Gradation Calculator is a beautifully crafted calculator that turns every button press into a burst of living color. Powered by real-time fluid simulation rendered directly in Metal, the background flows and shifts with vibrant gradients โ€” reacting to every number you enter and exploding into a full rainbow when you hit equals. Now with a full scientific keypad, it's as capable as it is beautiful: switch on function mode and the same fluid canvas backs trigonometry, logarithms, powers, roots, and more. Features: โ€ข Scientific calculator โ€” tap ฦ’(x) to reveal trig (sin / cos / tan and their inverses), hyperbolic functions, logarithms, powers and roots, factorial, reciprocals, the constants ฯ€ and e, parentheses, and scientific notation โ€ข Natural math notation โ€” expressions display the way you'd write them: โˆš2, ln(9), 3ยฒ, ยณโˆš(9), logโ‚โ‚€(9) โ€ข 2nd & Deg/Rad โ€” a 2nd key unlocks inverse functions, with switchable degree and radian modes โ€ข Color themes โ€” choose your mood with Ocean, Sunset, Aurora, and Galaxy gradient palettes โ€ข Real-time fluid simulation โ€” smooth, GPU-powered color flow that responds to every tap โ€ข Rainbow burst on equals โ€” a satisfying full-color explosion every time you calculate โ€ข Calculation history โ€” review past results and tap any entry to reuse it instantly โ€ข Long-press to copy โ€” hold the result to copy it to your clipboard with haptic feedback โ€ข Elegant minimal UI โ€” transparent buttons float over the dynamic gradient background โ€ข Dark-mode native โ€” designed from the ground up for a stunning dark display

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

Gradation Calculator1 screens
Countdown Days4 screens

Verdict

The call

The clearest difference is in-app purchases: Gradation Calculator at none against Countdown Days's 3. Countdown Days's advantage is device support (3 vs 1) and iOS requirement (15.6 vs 18.2). On price and ads 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. Gradation Calculator asks for nothing beyond the download.

Scorecard3 real differences ยท 3 level
Gradation Calculator versus Countdown Days: the parameters behind the verdict, then further details
ParameterGradation CalculatorCountdown Days
PriceFreeFree
Update frequencyโ€”Every 5 weeks
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, iPod โ€” better
Requires iOS18.215.6 โ€” better
Further details โ€” not scored
Size6 MB45 MB
Age rating12+4+
DeveloperMASATO MISAWA้•ฟๅฎ ไพฏ

In-app purchases

None

Gradation Calculator

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 Gradation Calculator free?
Gradation Calculator 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 Gradation Calculator or Countdown Days have ads?
Neither Gradation Calculator nor Countdown Days shows ads.

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