Signal
Private messaging and calls backed by an open encryption protocol.
Signal is a free messaging app for encrypted conversations, voice and video calls, group chats, media sharing, and file transfers. It is run by an independent nonprofit and emphasizes privacy by default, with no advertising or tracking-based business model.
Why it stands out
- Encryption is presented as the default for every message and call, not a separate private mode.
- Operated by a 501(c)(3) nonprofit rather than an ad-funded platform or major tech subsidiary.
- Uses the widely known open source Signal Protocol behind its secure messaging design.
- Covers core messenger features—groups, media, files, stickers, voice, and video—without relying on tracking or ads.
- Available across major mobile and desktop operating systems.
Good to know
- Free messaging and calling use an internet or mobile data connection, so carrier data charges may still apply.
- The site advertises native mobile and desktop apps, not a browser-based web client.
- It is focused on messaging and calling; it is not a broader social network, email service, or team workspace suite.
Photos
Privacy-conscious individuals and groups who need everyday messaging without ad tracking or readable server-side message content. Send encrypted texts, voice notes, photos, videos, GIFs, and files over a data connection. Make voice or video calls without long-distance phone charges. Coordinate with family, friends, or coworkers in encrypted group chats. Use encrypted stickers or create custom sticker packs for conversations.
End-to-end encrypted messaging and calls using the open source Signal Protocol; text, voice messages, photos, videos, GIFs, and file sharing; voice and video calling; encrypted sticker packs with custom pack creation; group chats; apps for Android, iPhone/iPad, Windows, Mac, and Linux; nonprofit funding model with no ads or trackers.
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- WhatsApp — whatsapp.com
- Telegram — telegram.org
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- Wire — wire.com
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