# CKalender vs Da Buzzer

The clearest difference is review sentiment: Da Buzzer at 80% against CKalender's 0%. Da Buzzer also leads on in-app purchases (none vs 1). CKalender's advantage is update cadence (every 4 months vs every 15 months) and iOS requirement (11.0 vs 17.0). On price, ads, monetization model and device support there is nothing between them.

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

CKalender ships an update every 4 months, Da Buzzer every 15 months. The most recent releases landed on October 13, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | CKalender | Da Buzzer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (6 ratings)](https://appshunter.io/ios/app/da-buzzer/id1528230392/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | 0.0% of reviews | **80.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 15 months |
| Monetization | Free | Free |
| Size | 3 MB | 12 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Reinhard Hanselmann](https://appshunter.io/developer/848981931) | [Rahul Rahate](https://appshunter.io/developer/1492366192) |

## What reviewers say

### CKalender

[App page](https://appshunter.io/ios/app/ckalender/id848981928)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CKApp-Freischaltung | $2.99 | one-time |


### Da Buzzer

[App page](https://appshunter.io/ios/app/da-buzzer/id1528230392)

This app allows you to know when visitors arrive without installing hardware. Generate a unique QR code that guests scan to send you an instant notification. It's ideal for homes and businesses, supporting multiple users and working anywhere with internet access.

**Highlights:** QR code powered doorbell, Instant visitor notifications, No hardware or batteries required, Supports multiple users, Works anywhere with internet, Customizable visitor pages

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CKalender free?

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

### Is Da Buzzer free?

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

### Do CKalender or Da Buzzer have ads?

Neither CKalender nor Da Buzzer shows ads.

### Which is updated more often, CKalender or Da Buzzer?

CKalender ships an update every 4 months, and Da Buzzer every 15 months. Most recently, CKalender was updated on October 13, 2026 and Da Buzzer on September 23, 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.*