Signal Foundation (US 501c3), Mountain View. Open-source E2E messenger. Non-profit but US.
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Ordered by feature parity and migration friction, which is weighted higher than feature breadth.
Figure 1Closest matches to Signal
Swiss E2EE messenger (Pfäffikon SZ, founded 2012), own servers in ISO 27001-certified Swiss data centres, no phone number required; consumer + enterprise (Threema Work) + on-prem.
French E2EE messenger (Olvid SAS, Paris, founded 2019), ANSSI CSPN certified, mandated for French government ministers; no phone number/identifier, content + metadata encrypted.
UK-incorporated open-source E2EE messenger (SimpleX Chat Ltd, 2021) with no user identifiers of any kind; Double Ratchet + post-quantum key exchange; self-hostable relays, twice audited by Trail of Bits.
All 5 alternatives, benchmarked against Signal.
Swiss E2EE messenger (Pfäffikon SZ, founded 2012), own servers in ISO 27001-certified Swiss data centres, no phone number required; consumer + enterprise (Threema Work) + on-prem.
French E2EE messenger (Olvid SAS, Paris, founded 2019), ANSSI CSPN certified, mandated for French government ministers; no phone number/identifier, content + metadata encrypted.
UK-incorporated open-source E2EE messenger (SimpleX Chat Ltd, 2021) with no user identifiers of any kind; Double Ratchet + post-quantum key exchange; self-hostable relays, twice audited by Trail of Bits.
Swiss-headquartered enterprise messaging + video (Wire Swiss GmbH, Zug + Berlin), MLS E2EE, BSI VS-NfD Zulassung for Wire Bund, 90%+ European institutional ownership.
UK-headquartered open-source Matrix protocol commercialisation; powers Bundeswehr BwMessenger + French Tchap + NATO + UN.
Beyond compliance: how these alternatives compare on the capabilities you actually use day to day.
| Feature | Threema | Olvid | SimpleX Chat | Wire | Element (Matrix) |
|---|---|---|---|---|---|
| Self-hostable | Yes | No | Yes | Yes | Yes |
| Max participants | 16 participants | 3 participants | 2 participants | 150 participants | Not assessed |
| Screen sharing | Yes | Not assessed | Yes | Yes | Yes |
| End-to-end encryption | Yes | Yes | Yes | Yes | Yes |
| Browser join (no app) | Not assessed | Not assessed | Not assessed | Yes | Yes |
Source: vendor documentation, as of Aug 2026.
Listed for transparency. Every product on this page is benchmarked against this baseline.
Listed for transparency. Every product on this page is benchmarked against this baseline.
Signal Foundation (US 501c3), Mountain View. Open-source E2E messenger. Non-profit but US.
For every product we read the public DPA, sub-processors document, hosting region declaration, and corporate ownership records. Each is timestamped. Signals are editorial, re-verified quarterly. We never accept self-attestation.
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