CalcFlex vs Moon Clock
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
CalcFlex
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Discover CalcFlex: Flexible, Free and Ad-Free Calculator App! Unlock the full potential of your calculations with CalcFlex, the flexible calculator app designed to cater to all your needs. Whether you're dealing with complex equations, unit conversions, financial calculations, or scientific formulas, CalcFlex has got you covered. Key Features: Multiple Calculators in Parallel: Seamlessly switch between different calculators for efficiency. Built-in Tools: Access unit converters, finance calculators, math and physics equations all in one app. Custom Equations: Create, save, and reuse your own equations with specific variables tailored to your needs. User-Friendly Design: Start with the familiar calculator layout, free to customize based on preference. Completely Free: No ads, no hidden fees, just pure calculating power. Download CalcFlex now and experience the freedom of a truly flexible and comprehensive calculator app!
Moon Clock
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Moon Clock is a full-screen clock with Moon phase widgets. Check the time, and take a moment to look at todayβs Moon. A Moon for your Home Screen Choose a small, medium, or large widget and put it where youβll see it often. Check the time and lunar phase without opening the app. See the Moon in full screen Open Moon Clock to give the Moon and time room to fill your screen. The phase and lighting change with time, and you can choose an observing location to see the Moon from there. Find a look you like Keep the natural lunar surface, or try pixel, halftone, and CRT effects. Mix fonts, text effects, and Moon styles, then arrange your full-screen clock. Your widgets can follow your chosen fonts and Moon effects, so thereβs no need to set them up again. Take a closer look The 3D Moon is built from real lunar imagery and elevation data. Zoom in to explore craters, ridges, and the shadows they cast. Rotate the Moon freely to see the far side, hidden from view on Earth. Free features and Moon Clock Pro The basic clock and widgets with the default look are free. Moon Clock Pro is a one-time purchase with a permanent unlock. No subscription. It includes: β’ Every font, text effect, and Moon style β’ Creating and saving your own text styles and freeform layouts β’ Zooming in on the lunar surface and viewing the Moon from any angle Unlocked fonts and Moon effects are also available in widgets, with no separate purchase. No account or sign-in is required. Location access is optional; you can choose an observing location manually.
Screenshots
Verdict
The clearest difference is update cadence: CalcFlex at every 9 days against Moon Clock's every 6 weeks. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. CalcFlex sells 3 one-off in-app purchases and Moon Clock sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
CalcFlex ships an update every 9 days, Moon Clock every 6 weeks. The most recent releases landed on October 25, 2026 and November 6, 2026 respectively.
| Parameter | CalcFlex | Moon Clock |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 9 days β better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 β better | 18.0 |
| Further details β not scored | ||
| Size | 2 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniel Chiu Loong Ng | YI-WEN CHOU |
In-app purchases
CalcFlex
- +3 New Variables2 variants$1.99
- +20 New Equation Slots2 variants$1.99
- +1 New Calculator2 variants$3.99
Moon Clock
- Moon Clock Pro$5.99









