Comparison

CKalender vs School

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

About

CKalender

Manage and view appointments in an online group calendar directly from your smartphone or tablet. Requires an existing account with app activation for full functionality.

Highlights

View group calendar appointments
Manage appointments
Smartphone and tablet compatibility
Online group calendar integration

Read full description

CKalender ist eine App zur Anzeige und Pflege von Terminen im Online-Gruppenkalender v1.ckalender.de per Smartphone oder Tablet. Zur Nutzung ist ein bestehender CKalender-Account mit App-Freischaltung notwendig.

About

School

Features

Read full description

Die innovative Möglichkeit ihr Lüftungsgerät „School AHU“ zu bedienen. Mit der intuitiven Benutzeroberfläche können Sie ihr Lüftungsgerät bedienen sowie schnell und einfach in Betrieb nehmen. Verfügbare Funktionen: - Ein- und Ausschalten der Lüftungsanlage - Einstellen der Lüftungsstufen - Timer - Wochenprogramm - Einstellen der Zulufttemperatur ...und viele weitere Funktionen Die App ist mit den folgenden Systemair Lüftungsanlagen kompatibel - Alle Lüftungsanlagen der Serie "School-AHU"

Screenshots

CKalender3 screens

School4 screens

Verdict

The call

The clearest difference is in-app purchases: School at none against CKalender's 1. School also leads on update cadence (every 3 weeks vs every 4 months). On price, ads, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CKalender sells 1 one-off in-app purchase. School asks for nothing beyond the download.

UpkeepUpdate frequency

CKalender ships an update every 4 months, School every 3 weeks. The most recent releases landed on October 13, 2026 and October 12, 2026 respectively.

Scorecard2 real differences · 6 level

CKalender versus School: the parameters behind the verdict, then further details
Parameter	CKalender	School
Price	Free	Free
Positive reviews	0.0% of reviews	—
Update frequency	Every 4 months	Every 3 weeks — better
Ads	No	No
In-app purchases	Yes	No — better
Monetization	Free	—
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	11.0	11.0
Further details — not scored
Size	3 MB	25 MB
Age rating	4+	4+
Developer	Reinhard Hanselmann	Systemair Production AB

In-app purchases

1 purchases

CKalender

One-time1

CKApp-Freischaltung$2.99

None

School

No in-app purchases

Questions

Is CKalender free?

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

Is School free?

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

Do CKalender or School have ads?

Neither CKalender nor School shows ads.

Which is updated more often, CKalender or School?

CKalender ships an update every 4 months, and School every 3 weeks. Most recently, CKalender was updated on October 13, 2026 and School on October 12, 2026.