Comparison

12Calendar vs Flip Clock

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

Head to head
About

12Calendar

Customize your lock screen with a calendar. Choose from various layouts, fonts, and colors to display your schedule conveniently. Add custom holidays by importing from your device's calendar.

Highlights
  • Customizable calendar layouts
  • Selectable fonts and colors
  • Adjustable transparency and frame borders
  • Add custom holiday data
  • Import holidays from iOS calendar
  • Display year, month, and day of the week
Read full description

Every time you open your lock screen, a beautiful calendar is right there to greet you. That's the everyday experience 12Calendar creates. Customize fonts, colors, and layouts to build a calendar wallpaper that's uniquely yours — simply and easily. ■ Layouts Choose from 28 calendar layouts. Free Layout mode lets you drag and resize each calendar freely. - You can change the size from the popup that appears when you tap the calendar. ■ Customize Every Detail - Individual color settings for weekdays, Saturdays, and Sundays - Day-of-week display language - 12 fonts with adjustable text size - Background opacity and border visibility - Week start day (Sunday or Monday) ■ Holiday Support Add holidays manually within the app. With an in-app purchase, holidays can be imported from your iOS Calendar. ■ How to Set Your Wallpaper After saving your calendar, set it as your wallpaper via the Photos app or iOS Settings. (Wallpaper cannot be changed directly from within this app.) ※ App Store screenshots were created using Screenshots.pro.

About

Flip Clock

This app provides a classic digital clock widget for your device's home, lock, and standby screens. It offers features like displaying seconds, a calendar, customizable themes, and various timekeeping tools including alarms, timers, and stopwatches. It can also function as a screensaver when charging.

Highlights
  • Display seconds on multiple screens
  • Full screen time and date
  • Smart alarm clock
  • Timer and stopwatch
  • Countdown to target dates
  • Pomodoro Technique timer
  • Customizable widget signatures
Features
Read full description

Transform your iPhone and iPad into a stylish, functional retro flip clock. Whether you need a sleek desk clock for your workspace, a soothing nightstand clock, or a personalized focus timer, Flip Clock brings classic minimalism and personal flair to your everyday workflow. Perfect for StandBy mode, Lock Screen widgets, and full-screen focus sessions. ◆ Aesthetic Clock and StandBy Mode - Full-Screen Flip Clock: Vintage flip animation with customizable themes. - OLED Burn-In Protection: Built-in pixel shifting technology protects your screen during long always-on sessions. - Show Seconds Everywhere: Real-time seconds display on Home Screen, Lock Screen, Dynamic Island, and StandBy mode. - Smart Auto-Launch: Automatically turns into a screensaver when charging. - 12/24 Hour Formats: Toggle easily with flexible date and calendar displays. ◆ Custom Signatures and Aesthetic Widgets - Personal Signatures Anywhere: Add custom text, mottoes, or signatures directly in the app and on your Lock Screen and Home Screen widgets. - Aesthetic Widgets: Beautiful, customizable widgets featuring clock, calendar, and your personal text. - Multiple Clock Themes: Personalize colors, fonts, and styles for any desk setup. ◆ Focus, Timers and Productivity Tools - Count-up and Countdown Timers: Flexible stopwatch count-up timers and precise countdown timers for workouts, study sessions, and daily tasks. - Pomodoro Technique: Stay in the flow zone with integrated study and work interval timers. - Floating Stopwatch: Keep a live floating timer widget over other apps. - Event Countdown: Track big upcoming moments like New Year's, exams, birthdays, and holidays. - White Noise Player: Soothing background sounds to boost concentration or help you sleep. ◆ Smart Alarms and Online Music Ringtones - Rich Online Music Library: Choose from a wide selection of online music tracks, ambient sounds, and ringtones to wake up your way. - Smart Volume Control: Alarms that gently wake you up by automatically adjusting volume gradually. - Hourly Chime: Friendly voice/sound timekeeping on the hour. Upgrade your desk setup and daily routine today with Flip Clock!

Screenshots

12Calendar4 screens
Flip Clock4 screens

Verdict

The call

The clearest difference is rating: Flip Clock at 4.6 against 12Calendar's 3.2. Flip Clock also leads on ratings volume (71K vs 11) and update cadence (monthly vs every 3 months). 12Calendar's advantage is ads (none vs shown). On price, 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. 12Calendar sells 4 one-off in-app purchases and Flip Clock sells 10 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Flip Clock holds the better App Store score, 4.6 against 3.2. That said, the two scores are not equally well evidenced: Flip Clock has 71K ratings behind it against 11, so its average is the more settled of the two. Written reviews point the same way: 62% of 12Calendar's written reviews are positive against 72% of Flip Clock's.

UpkeepUpdate frequency

12Calendar ships an update every 3 months, Flip Clock monthly. The most recent releases landed on November 1, 2026 and November 10, 2026 respectively.

Scorecard7 real differences · 3 level
12Calendar versus Flip Clock: the parameters behind the verdict, then further details
Parameter12CalendarFlip Clock
PriceFreeFree
Rating3.2 (11 ratings)4.6 (71K ratings) — better
Positive reviews61.5% of reviews72.4% of reviews — better
Number of ratings1171K — better
Update frequencyEvery 3 monthsMonthly — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPodiPhone, iPad, iPod, Mac — better
Requires iOS17.015.0 — better
Further details — not scored
Size3 MB80 MB
Age rating4+4+
Developerlagoon翠玲 施

Customer experience

12Calendar

All ratings11 ratings
Positive45.5%
Neutral18.2%
Negative36.4%
Written reviews65 reviews
Positive61.5%
Neutral20.0%
Negative18.5%

Flip Clock

All ratings71,064 ratings
Positive90.7%
Neutral3.8%
Negative5.5%
Written reviews2,170 reviews
Positive72.4%
Neutral8.3%
Negative19.3%

Bugs and requests

12Calendar

Not enough reviews yet to summarise bugs or requests.

Flip Clock

Reported bugs

4 issues
  • Clock freezing or not updating correctly
  • Alarm issues (not triggering, unable to disable)
  • Inconsistent behavior across devices and OS versions
  • Unlock/restore purchase bugs

Requested features

5 requests
  • More clock face and color options
  • Automatic dark/light mode switching
  • Ability to set clock as device wallpaper
  • Improved alarm functionality and customization
  • Seamless integration with other devices

In-app purchases

4 purchases

12Calendar

One-time4
  • UpgradeFree
  • Hide Logo & SAVE available$0.99
  • Enable load calendar$0.99
Show 1 more
  • Clear all functional limitation$1.99
10 purchases

Flip Clock

One-time10
  • Digital Clock 2$0.99
  • Digital Clock 3$0.99
  • Digital Clock 4$0.99
Show 7 more
  • Digital Clock 5$0.99
  • Digital Clock 6$0.99
  • Simulated Desk Fan 1$0.99
  • Remove Ads$0.99
  • More clock skins$0.99
  • Flip Clock Professional Edition$2.99
  • Unlock All Screensavers$9.99

Questions

Is 12Calendar free?
12Calendar is free to download, with in-app purchases available.
Is Flip Clock free?
Flip Clock is free to download, with in-app purchases available.
Which has better reviews, 12Calendar or Flip Clock?
Flip Clock is rated higher. 12Calendar averages 3.2 out of 5 from 11 ratings, while Flip Clock averages 4.6 from 71K ratings.
Do 12Calendar or Flip Clock have ads?
Flip Clock shows ads; 12Calendar does not.
Which is updated more often, 12Calendar or Flip Clock?
12Calendar ships an update every 3 months, and Flip Clock monthly. Most recently, 12Calendar was updated on November 1, 2026 and Flip Clock on November 10, 2026.

Other comparisons