# Calc pH vs Calendar Clock

The clearest difference is price: Calc pH at Free against Calendar Clock's $0.99. Calc pH also leads on iOS requirement (9.0 vs 26.5). On update cadence, ads, in-app purchases and device support there is nothing between them.

Calc pH is free to download; Calendar Clock costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Calc pH ships an update every 59 months, Calendar Clock every 41 months. The most recent releases landed on September 17, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Calc pH | Calendar Clock |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 59 months | **Every 41 months** |
| Monetization | — | Paid |
| Size | 0 MB | 4 MB |
| Requires iOS | **9.0** | 26.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ZOFTERM](https://appshunter.io/developer/557950548) | [Systemiko Inc.](https://appshunter.io/developer/680630947) |

## What reviewers say

### Calc pH

[App page](https://appshunter.io/ios/app/calc-ph/id566354963)

**Features:** macOS Compatibility

**In-app purchases:** none


### Calendar Clock

[App page](https://appshunter.io/ios/app/calendar-clock/id1451445740)

This app displays the current year, month, week, and time on a single screen with a clean design. It offers customizable theme colors and functions as a desk clock. The app disables device sleep mode while active.

**Highlights:** All-in-one screen display, Year, month, week, day, hour, minute, second, Switchable theme colors (dark, light, green, blue), Disables device sleep mode, Acts as a desk clock

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calc pH free?

Calc pH is free to download, with no in-app purchases.

### Is Calendar Clock free?

Calendar Clock costs $0.99, with no in-app purchases.

### Do Calc pH or Calendar Clock have ads?

Neither Calc pH nor Calendar Clock shows ads.

### Which is updated more often, Calc pH or Calendar Clock?

Calc pH ships an update every 59 months, and Calendar Clock every 41 months. Most recently, Calc pH was updated on September 17, 2026 and Calendar Clock on September 10, 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.*