number days vs Datum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
number days
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Days calculation of world calendar
Datum
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.
- 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
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Datum is a minimalistic iOS, watchOS, macOS and visionOS calendar app. For iOS there are Lockscreen Widgets that show you the current date and there are Lockscreen Widgets that show up to 3 events for today. The iOS and macOS apps include the following widgets: - a small widget that shows the current date and at the bottom the events for this day - a small widget that shows a calendar with up to 3 event marks for each day - a medium widget that shows the same as the first small widget and on the right side a calendar with up to 3 event marks for each day - a large widget that shows the same as the medium widget and a list of the upcoming events - a extra large widget that shows a calendar and a list of the upcoming events (only for iPadOS 15+) The watchOS app shows a calendar with up to 3 event marks for each day. You can switch to the next/previous month by tapping on the arrows at the bottom of the calendar. You can view all events for each day by tapping on a day. There are also complications for all watchfaces included that show you the current date.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | number days | Datum |
|---|---|---|
| Price | Free — better | $1.99 |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Weekly — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac, Apple Watch, Vision Pro — better |
| Requires iOS | 13.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 135 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | masayuki morishita | Michael Lindinger |
In-app purchases
number days
No in-app purchases
Datum
No in-app purchases
