# number days vs Datum

The clearest difference is price: number days at Free against Datum's $1.99. number days also leads on update cadence (weekly vs every 3 months) and iOS requirement (13.0 vs 17.6). Datum's advantage is device support (5 vs 3). On ads and in-app purchases there is nothing between them.

number days is free to download; Datum costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

number days ships an update weekly, Datum every 3 months. The most recent releases landed on October 26, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | number days | Datum |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 3 months |
| Monetization | — | Paid |
| Size | 135 MB | 15 MB |
| Requires iOS | **13.0** | 17.6 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, Mac, Apple Watch, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [masayuki morishita](https://appshunter.io/developer/470221486) | [Michael Lindinger](https://appshunter.io/developer/1431086653) |

## What reviewers say

### number days

[App page](https://appshunter.io/ios/app/number-days/id476021365)

**Features:** macOS Compatibility

**In-app purchases:** none


### Datum

[App page](https://appshunter.io/ios/app/datum-calendar/id1552646317)

A minimalist calendar application designed for Apple devices, offering a clean interface and customizable widgets for iOS, macOS, and watchOS. View upcoming events, daily schedules, and monthly overviews directly from your home screen or watch face.

**Highlights:** Minimalist calendar interface, Lockscreen widgets for iOS, Event display widgets, Calendar widgets with event marks, watchOS calendar and complications, Support for iPhone, iPad, Mac, and Apple Watch

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is number days free?

number days is free to download, with no in-app purchases.

### Is Datum free?

Datum costs $1.99, with no in-app purchases.

### Do number days or Datum have ads?

Neither number days nor Datum shows ads.

### Which is updated more often, number days or Datum?

number days ships an update weekly, and Datum every 3 months. Most recently, number days was updated on October 26, 2026 and Datum on October 24, 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.*