# The Date Calculator PRO vs Strange Clocks

The clearest difference is ads: Strange Clocks at none against The Date Calculator PRO's shown. Strange Clocks also leads on update cadence (every 3 days vs every 4 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. The Date Calculator PRO sells 7 in-app purchases, starting at $1.99 per 7 days and Strange Clocks sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

The Date Calculator PRO ships an update every 4 months, Strange Clocks every 3 days. The most recent releases landed on October 26, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | The Date Calculator PRO | Strange Clocks |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (2.6K ratings)](https://appshunter.io/ios/app/the-date-calculator-pro/id1045043882/reviews)** | — |
| Number of ratings | **2.6K** | — |
| Positive reviews | 65.5% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 3 days** |
| Monetization | Free with in-app purchases | — |
| Size | 7 MB | 9 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Brachmann Online Marketing GmbH & Co. KG](https://appshunter.io/developer/682848918) | [KIP Networks](https://appshunter.io/developer/1886007012) |

## What reviewers say

### The Date Calculator PRO

[App page](https://appshunter.io/ios/app/the-date-calculator-pro/id1045043882)

Easily calculate the duration between two dates, with or without accounting for the time of day. You can also add or subtract various time units from a specific date. The results are automatically converted into multiple units for your convenience.

**Highlights:** Calculate duration between two dates, Include time of day in calculations, Add/subtract years, months, weeks, days, Convert results to various time units, Account for daylight saving time changes

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $1.99 | per 7 days |
| Premium | $3.99 | per month |
| Premium | $3.99 | per month |
| Voluntary Payment 1 | $0.99 | one-time |
| Voluntary Payment 2 | $2.99 | one-time |
| Voluntary Payment 3 | $9.99 | one-time |
| Remove Ads | $12.99 | one-time |


### Strange Clocks

[App page](https://appshunter.io/ios/app/strange-clocks/id6814674635)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock all 15 clocks | $1.99 | one-time |


## Frequently asked questions

### Is The Date Calculator PRO free?

The Date Calculator PRO is free to download, with in-app purchases available.

### Is Strange Clocks free?

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

### Do The Date Calculator PRO or Strange Clocks have ads?

The Date Calculator PRO shows ads; Strange Clocks does not.

### Which is updated more often, The Date Calculator PRO or Strange Clocks?

The Date Calculator PRO ships an update every 4 months, and Strange Clocks every 3 days. Most recently, The Date Calculator PRO was updated on October 26, 2026 and Strange Clocks on October 16, 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.*