# CalcFlex vs Moon Clock

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.

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.

## The numbers

| Metric | CalcFlex | Moon Clock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 6 weeks |
| Size | 2 MB | 78 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Daniel Chiu Loong Ng](https://appshunter.io/developer/1755978644) | [YI-WEN CHOU](https://appshunter.io/developer/6799608432) |

## What reviewers say

### CalcFlex

[App page](https://appshunter.io/ios/app/calcflex-calculator/id6520389768)

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| +3 New Variables | $1.99 | one-time |
| +20 New Equation Slots | $1.99 | one-time |
| +1 New Calculator | $3.99 | one-time |


### Moon Clock

[App page](https://appshunter.io/ios/app/moon-clock-phases-and-widgets/id6799608430)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Moon Clock Pro | $5.99 | one-time |


## Frequently asked questions

### Is CalcFlex free?

CalcFlex is free to download, with in-app purchases available.

### Is Moon Clock free?

Moon Clock is free to download, with in-app purchases available.

### Do CalcFlex or Moon Clock have ads?

Neither CalcFlex nor Moon Clock shows ads.

### Which is updated more often, CalcFlex or Moon Clock?

CalcFlex ships an update every 9 days, and Moon Clock every 6 weeks. Most recently, CalcFlex was updated on October 25, 2026 and Moon Clock on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*