WhatsApp vs Signal
A side-by-side look at WhatsApp (the paid SaaS) and Signal (the open source alternative). Use this page to decide if the switch fits your team and workflow.
| Signal | ||
|---|---|---|
| Tagline | Global mobile messaging. | Encrypted messaging for individuals and small groups. |
| License | Proprietary SaaS | AGPL-3.0 / GPL-3.0 |
| Pricing | Free. | Free to self-host · optional paid hosted plan |
| Self-host option | No | Yes — difficulty 5/5 |
| Hosted cloud available | Yes (only option) | Yes |
| Desktop apps | Varies by product | Windows, macOS, Linux |
| Mobile apps | Official apps typically available | iOS, Android |
Best for
The gold-standard encrypted 1-to-1 and small group messenger.
Signal strengths
- Gold-standard end-to-end encryption.
- Non-profit governance.
- Clean, minimal UX.
Signal weaknesses
- Requires phone number for registration.
- Self-hosting the server is effectively impossible in practice.
- Not designed for large teams or admin controls.
What's the catch with WhatsApp?
- Owned by Meta; metadata and backup privacy concerns.
- No federation — you are locked into the platform.
- Mandatory phone number for account.
Still unsure?
Check the full list of alternatives to WhatsApp: see WhatsApp alternatives, or learn more about Signal on its project page.
Recommended reading
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When self-hosting goes wrong: seven failure modes and how to avoid them
An honest retrospective on the ways self-hosted setups break — not in theory, but in practice — and the small habits that prevent most of them.
Will the open source project you depend on still exist in three years?
Bus factor, maintainer burnout, funding models, and the signals that separate OSS projects that survive from those that quietly decay.