Comparison

Rect Clock vs Calendar Alarm

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

Head to head
About

Rect Clock

This app transforms your iPhone into a full-screen analog clock. Customize the clock face, index, and hands with various styles and colors. Enjoy a minimalist design with adjustable screen rotation and optional date display and auto-lock.

Highlights
  • Full-screen analog display
  • Customizable clock faces
  • Interchangeable index styles
  • Variety of hand designs
  • Adjustable hand movement
  • Screen rotation support
  • Configurable date and lock
Features
Read full description

An analog clock that fills the entire iPhone screen. Choose your favorite dial, indices, and hands to customize the clock to your style. A minimal design that perfectly complements the iPhone’s product design. ・ 12 dials: 6 included [Black / White / Silver / Wood / Leather / Luminous] + 6 available via in-app purchase [Space Black / Gold / Rose Gold / Skeleton / Stone / Power Saving] ・ 6 index styles × 6 colors: 2 included [Bar / Arabic Numerals (12-3-6-9)] + 4 available via in-app purchase [Roman Numerals / Roman Numerals (XII-III-VI-IX) / Arabic Numerals / Triangle] ・ 11 hand styles × 6 colors (12 colors for the second hand): 2 included [Bar / Dauphine] + 9 available via in-app purchase [Round / Pencil / Alpha / Lozenge / Baton / Leaf / Arrow / Spade / Breguet] ・ 3 hand movements [Sweep / Beat / Step] ・ Automatically rotates to portrait, landscape, or upside down to match your iPhone’s orientation ・ Date display [On / Off] ・ Auto-Lock [On / Off]

About

Calendar Alarm

Read full description

Calendar Alarm is the ultimate beautifully designed, all-in-one alarm clock and sleep aid built for modern scheduling. Most alarm clocks only let you set a time. Calendar Alarm lets you look ahead. Seamlessly select any date on the calendar and schedule specific, one-time, or recurring alarms months in advance. Whether it's an early flight next Tuesday, a critical meeting next month, or just your daily morning routine, Calendar Alarm ensures you wake up exactly when you need to. SOOTHING SLEEP MUSIC Drift off to sleep faster with our built-in ambient soundscapes. Choose from relaxing ASMR environments—including Ocean Waves, Gentle Rain, and a crackling Campfire. The audio plays seamlessly in the background even when your device is locked, automatically shutting off the moment your morning alarm triggers. KEY FEATURES: • Date-Based Scheduling: Pick exact dates on the calendar for future alarms. • System Volume Override: Alarms ring at your chosen volume, regardless of device settings. • Ambient Sleep Sounds: Uninterrupted background noise to help you sleep. • Lock Screen Controls: Manage your sleep music directly from your Lock Screen. • Premium Dark Mode UI: A stunning, distraction-free aesthetic perfect for night-time use. Take control of your mornings and your nights with Calendar Alarm.

Screenshots

Rect Clock1 screens
Calendar Alarm4 screens

Verdict

The call

The clearest difference is in-app purchases: Calendar Alarm at none against Rect Clock's 5. Calendar Alarm also leads on ads (none vs shown). Rect Clock's advantage is iOS requirement (15.6 vs 17.0). On price and device support 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. Rect Clock sells 5 one-off in-app purchases. Calendar Alarm asks for nothing beyond the download.

Scorecard3 real differences · 7 level
Rect Clock versus Calendar Alarm: the parameters behind the verdict, then further details
ParameterRect ClockCalendar Alarm
PriceFreeFree
Rating3.7 (168 ratings) — better—
Positive reviews59.2% of reviews—
Number of ratings168 — better—
Update frequencyEvery 2 weeks—
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPod — betteriPhone
Requires iOS15.6 — better17.0
Further details — not scored
Size195 MB14 MB
Age rating4+4+
Developery-designheirong Ltd

Bugs and requests

Rect Clock

Reported bugs

9 issues
  • Blank white screen on launch (iPhone XR, iPad Air 2)
  • App doesn't stay on when phone locks
  • App crashes or won't open after purchase
  • Settings screen appears on any touch
  • Unresponsive UI elements on iPad
Show 4 more
  • Battery percentage display frozen
  • Orientation doesn't adjust to device rotation
  • Ads still appear after paid purchase
  • App stopped working after updates

Requested features

13 requests
  • Alarm functionality
  • Lock screen integration
  • Live wallpaper capability
  • Apple Watch compatibility
  • Landscape/rotation support
Show 8 more
  • Always-on display when plugged in
  • Ticking sound effect
  • Adjustable brightness/dimming for night
  • Round clock face option
  • GMT/timezone hand option
  • Larger date/time display option
  • Screen saver mode
  • Additional color variations (red retro style)

Calendar Alarm

Not enough reviews yet to summarise bugs or requests.

In-app purchases

5 purchases

Rect Clock

One-time5
  • Add All Faces$0.99
  • Add All Indexes$0.99
  • Add All Hands$0.99
Show 2 more
  • Remove Ads$0.99
  • Full Version$2.99
None

Calendar Alarm

No in-app purchases

Questions

Is Rect Clock free?
Rect Clock is free to download, with in-app purchases available.
Is Calendar Alarm free?
Calendar Alarm is free to download, with no in-app purchases.
Do Rect Clock or Calendar Alarm have ads?
Rect Clock shows ads; Calendar Alarm does not.

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