Threema

Swiss encrypted messenger that works without phone number

Visit Website 🇨🇭 Switzerland

Open Source Messaging

Privacy Score

Grade A

Last reviewed: Jan 2026

How we score

View Score Breakdown

Data Residency (30%)

EU Only

Where is your data stored? EU-only storage gets full points.

Open Source (20%)

95/100

Is the code open source and auditable?

95/100

How clear, comprehensive, and user-friendly is the privacy policy?

Trackers (15%)

100/100

How many third-party trackers are used? Fewer is better.

92/100

How fair and user-friendly are the terms of service?

Replaces

WhatsApp Slack Microsoft Teams

Developer Info

API Available

Yes Good

Self-Hosting

Available Hard

License

AGPL-3.0 Open Source

Compliance

GDPR

Pricing

€4.99 one-time purchase

Threema is a Swiss messaging app that doesn’t require a phone number or email to sign up. It’s designed for maximum privacy with end-to-end encryption for all communication.

Key Features

No phone number needed: Anonymous ID system
End-to-end encryption: Messages, calls, and files
Swiss privacy: Servers in Switzerland
No data collection: Minimal metadata
Group polls and features: Full-featured messenger

Privacy Highlights

Threema generates a random ID - no phone number or email required. Message metadata is deleted immediately after delivery. All servers are located in Switzerland. The company has passed independent security audits.