bClk vs Greatest Common Factor
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
bClk
This customizable night clock offers a vibrant color palette and adjustable brightness, perfect for use in low-light conditions. It includes features like displaying a second time zone and a unique swipe gesture for flashlight functionality. The app is designed to stay on while plugged in, with intelligent power management when unplugged.
- Customizable colors and brightness
- 12/24 hour format with PM indicator
- Display of a second time zone
- Swipe gesture for flashlight mode
- Orientation-dependent controls
- Auto-lock management for continuous display
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Night clock. Choice of 12 or 24 hr format. 12hr format has an extra "." to denote pm hours. Whole rainbow of color choices and variable brightnesses. Guide button leads you to separate page (and disappears after 3 seconds if not tapped). Set color/brightness by tapping on digits so you are less likely to change something while just handling the clock in the dark. Be sure to plug in because it does draw power. Single tap: change brightness. Double tap: change digit color. Swipe the digits to change background color to bright red to use as a night flashlight. Swipe digits again to get back to black blackground (and old brightness). Both brightness change and color change are orientation-dependent. Single tap in Portrait mode increases brightness, in Landscape decreases brightness. Similarly, double-tap in Portrait cycles one way and reverses if in Landscape. Display another time zone: If you are living in Maui but your officemates are all in Chicago and you want to keep track of what time it is there. Digits are italic if the time zone is enabled. AutoLock is turned off in the app so the clock continues to display during the night but with v1.80 and up if the phone is unplugged or power is lost then the display will turn off after the number of minutes set in the AutoLock feature. If AutoLock is set to never then the display will stay on but at the lowest power consumption setting. A 1/2 full battery icon is displayed if battery is being drained (see screenshot for largest iPhone).
Greatest Common Factor
This app helps users find the factors of numbers, calculate the Greatest Common Factor (GCF) for two or more numbers, and simplify fractions. It's a useful tool for understanding number theory concepts and performing fraction simplification.
- Find factors of a number
- Calculate GCF of two or more numbers
- Simplify fractions
- Understand number theory concepts
- Fraction simplification tool
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The factors of a number are all the integers that you can evenly divide into that number. The Greatest Common Factor (GCF) is the greatest integer that divides exactly into two or more numbers with no remainder. The Greatest Common Factor is used to simplify fractions. To simplify a fraction, you can divide the numerator and denominator of the fraction by the GCF of the numerator and denominator. Factors, the Greatest Common Factor, and simplifying fractions go hand-in-hand. Use this app to get the factors of a number, get the Greatest Common Factor of two or more numbers, and to simplify fractions.
Screenshots
Verdict
The clearest difference is price: bClk at Free against Greatest Common Factor's $0.99. bClk also leads on update cadence (monthly vs every 38 months) and ratings volume (4 vs 1). Greatest Common Factor's advantage is rating (5.0 vs 4.0). On ads, in-app purchases, monetization model 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
bClk is free to download; Greatest Common Factor costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Greatest Common Factor holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.
bClk ships an update monthly, Greatest Common Factor every 38 months. The most recent releases landed on October 10, 2026 and September 30, 2026 respectively.
| Parameter | bClk | Greatest Common Factor |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 4.0 (4 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | 1 |
| Update frequency | Monthly — better | Every 38 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.2 — better | 14.1 |
| Further details — not scored | ||
| Size | 0 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Sean Brennan | H Valeur |
Customer experience
bClk
Greatest Common Factor
In-app purchases
bClk
No in-app purchases
Greatest Common Factor
No in-app purchases
Questions
Is bClk free?
Is Greatest Common Factor free?
Which has better reviews, bClk or Greatest Common Factor?
Do bClk or Greatest Common Factor have ads?
Which is updated more often, bClk or Greatest Common Factor?
Other comparisons
