Comparison

Momentous Clock vs ClockAPX

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

Head to head
About

Momentous Clock

This app transforms your device's clock into a dynamic display of mathematical properties and number theory facts for the current time. It optionally reveals personal number connections from your contacts, all processed securely on your device.

Highlights
  • Computes mathematical properties of time
  • Surfaces number theory facts
  • Displays time on 16-segment LED screens
  • Finds personal number connections in contacts
  • On-device contact matching
  • Works via Catalyst on Mac
Features
Read full description

Time isn’t just 6:31. It’s 631 - a prime! A lucky prime... It’s the combination to the bike lock you had as a kid. It might be the last digits of the cell phone of someone you love. This is a clock for people who notice things like that. Every minute, it: • Computes mathematical properties of the current time • Surfaces number theory facts (prime, factorization, powers, sequences, curiosities) • Scrambles them onto glowing 16-segment LED displays, like your old Speak 'n Spell • Optionally finds personal number connections in your contacts — entirely on device Works great as a Mac app via Catalyst. Contact matching happens entirely on device. No personal data is ever transmitted. Usage analytics (anonymous) are collected to improve the app. If you’ve ever factored timestamps in your head, smiled at 5:12 = 2⁹, or paused at 17:29… This is the clock for you. Make every minute momentous.

About

ClockAPX

Read full description

ClockAPX turns your iPhone into a customizable clock studio for TVs and external displays. Pick a clock face, tune the look, and mirror it in real time for desks, studios, classrooms, and focus sessions. What you can do - Mirror your selected clock to a TV or external display with live updates - Choose from a large library of clock faces across digital, analog, world clock, and timer styles - Run timers your way: Countdown, Stopwatch, Interval/HIIT, and Pomodoro Ring - Add world clocks and reorder time zones for global teams and travel - Personalize typography, 24-hour format, seconds/date visibility, and layout details - Style backgrounds with palettes, photos, symbols, and custom color controls - Enable context-aware face switching for Day, Night, and Work - Use display-focused options like always-on optimization and burn-in safe shift Start free with a limited set of designs and themes. Upgrade to Premium to unlock the full design and appearance library (subscription and lifetime options available). Privacy Policy: https://github.com/kjwamlex/ClockAPX-Privacy-Policy/blob/main/README.md End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Momentous Clock4 screens
ClockAPX4 screens

Verdict

The call

The clearest difference is in-app purchases: Momentous Clock at none against ClockAPX's 3. Momentous Clock also leads on ads (none vs shown) and device support (3 vs 1). On price 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. ClockAPX sells 3 in-app purchases, starting at $1.99 per month. Momentous Clock asks for nothing beyond the download.

Scorecard4 real differences · 5 level
Momentous Clock versus ClockAPX: the parameters behind the verdict, then further details
ParameterMomentous ClockClockAPX
PriceFreeFree
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 6 days—
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better26.2
Further details — not scored
Size24 MB13 MB
Age rating4+4+
DeveloperTutukain Software, LLCJoonwoo Kim

In-app purchases

None

Momentous Clock

No in-app purchases

3 purchases

ClockAPX

Subscriptions2
  • ClockAPX Plus Monthly$1.991 Month
  • ClockAPX Plus Yearly$9.991 Year
One-time1
  • ClockAPX Plus Lifetime$14.99

Questions

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

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