Calendar vs Plus
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calendar
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Supported Languages: German and English With this app you can train your ability to calculate a weekday for any given date. It offers a great variety of training methods. This app also gives you an overview of my method/simplification on how the algorithm works and how you can calculate it in your head.
Plus
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With this little app you child will learn very easily plus arithmetic tasks. The app collect no data, do not need any internet connection and never use any advertising.
Screenshots
Verdict
The clearest difference is price: Plus at Free against Calendar's $31.99. Plus also leads on update cadence (every 5 months vs every 31 months). On ads, in-app purchases, device support and iOS requirement 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
Plus is free to download; Calendar costs $31.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Calendar ships an update every 31 months, Plus every 5 months. The most recent releases landed on October 18, 2026 and October 27, 2026 respectively.
| Parameter | Calendar | Plus |
|---|---|---|
| Price | $31.99 | Free — better |
| Update frequency | Every 31 months | Every 5 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 14.3 — better |
| Further details — not scored | ||
| Size | 1 MB | 0 MB |
| Age rating | 4+ | 4+ |
| Developer | Martin Eisele | Michael Hohlfeld |
In-app purchases
Calendar
No in-app purchases
Plus
No in-app purchases
