Signal vs Threema

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Signal compared with Threema
Detail	Signal	Threema
What it does	Speak Freely	Secure instant messenger from Switzerland with GDPR-compliant messaging for privacy and data protection
Stage	Established	Not given
Founded	Not given	Not given
Based in	Not given	CH
Pricing model	Free	Freemium
Pricing	Not given	Not given
Key features	End-to-end encryption Voice and video calls Group chats File sharing Encrypted stickers	End-to-end encrypted text messages Voice and video calls Group chats and distribution lists File and media sharing Desktop and web client Group calls Screen sharing on desktop Polls Contact verification via QR code Availability status for work
What makes it different	No ads, trackers, or data collection Independent nonprofit structure Open source Signal Protocol Free to use	No phone number or email required for anonymous communication Zero-knowledge architecture ensuring only intended recipients access messages Minimal metadata with messages deleted from servers after delivery Swiss company with exclusive development and Swiss data centers Open source code with verifiable security through audits
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	87 no change since last check	77 −1 (down) since last check
Trust Flow (Majestic)	53	45
Citation Flow (Majestic)	66	55
Referring domains (Majestic)	27692	5451

4 details filled in for both companies.