Smackcheck

Smackcheck

About this app

Smackcheck is an end-to-end encrypted messenger from Germany—with a simple anti-spam mechanism: Each message costs a small amount. Barely noticeable to you. For spam bots, it's the end of their business model.

HOW IT WORKS
Mass spam is only profitable because emails are free. As soon as each message costs a few cents, the model collapses—leaving you with messages from people who genuinely want to tell you something.


YOUR DATA BELONGS TO YOU
- End-to-end encryption: Only you and the other person can read the messages—not even us
- Servers in Germany, German law—data export and account deletion directly in the app
- No advertising, no tracking, no sharing with third parties for advertising purposes
- Encrypted subject lines—even the subject remains private

PROFESSIONAL COMMUNICATION

- PDF evidence log with timestamp and SHA-256 checksum—fully documented
- Subject line for each conversation—like a digital registered letter
- For lawyers, consultants, and anyone for whom confidentiality is paramount

SECURITY

- RSA-2048 + AES-256-GCM hybrid encryption
- Key letter as backup—your key, your control

- 2-factor authentication (TOTP)

- Self-hosted on our own servers in Germany

150 messages starting credit—try it for free, no credit card required.


smackcheck.com

What’s new

Smackcheck – Ende-zu-Ende-verschlüsselte Nachrichten mit Empfangsnachweis.

- Konversationen starten: Empfänger per @handle oder E-Mail einladen
- Ende-zu-Ende-Verschlüsselung – Inhalte sind nur auf den Endgeräten lesbar
- Empfangsnachweis als PDF-Protokoll zu jeder Konversation
- kostenloses Startguthaben
- Keine Werbung, kein Tracking, Serverbetrieb in Deutschland