ChatSecure is an open‑source, end‑to‑end encrypted messaging app built on XMPP. Below is a curated list of 20 free instant‑messaging solutions that provide strong privacy, encryption, and cross‑platform support as alternatives.
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Widely‑used, open‑source messenger with strong end‑to‑end encryption, voice/video calls, and disappearing messages.
Cloud‑based messenger offering optional end‑to‑end encrypted secret chats, self‑destruct timers, and large file sharing.
Secure collaboration platform with end‑to‑end encrypted messaging, voice/video calls, and file sharing for personal use.
Decentralized, onion‑routed messenger that requires no phone number or email, providing metadata‑resistant communication.
Matrix‑based client offering end‑to‑end encryption, bridges to other networks, and self‑hosting options.
Peer‑to‑peer, fully distributed messenger and video‑call app with no central server and built‑in encryption.
Offline‑first messenger that syncs over Bluetooth, Wi‑Fi, or Tor, designed for activists and journalists.
Open‑source team chat platform with optional end‑to‑end encryption; free tier available for small groups.
Open‑source Slack alternative offering self‑hosted messaging with optional encryption plugins.
Free version of Wickr offering end‑to‑end encrypted messaging, self‑destructing media, and secure file sharing.
Swiss‑based messenger with end‑to‑end encryption; a limited free version (Threema Lite) is available on Android.
Decentralized, peer‑to‑peer messenger and video‑call client with built‑in encryption and no central servers.
Anonymous messenger that routes traffic through the Tor network, eliminating the need for usernames or servers.
Classic multi‑protocol desktop client; add the Off‑the‑Record plugin for strong end‑to‑end encryption.
Uses existing email infrastructure to provide instant‑messaging‑like experience with end‑to‑end encryption via Autocrypt.
Secure chat, file sharing, and git hosting built on public‑key cryptography; free for personal use.
Threaded open‑source chat platform with optional end‑to‑end encryption; free tier for small teams.
Open network for secure, decentralized communication; any client (e.g., Element) can connect for free.
Combine a free VPN like WireGuard with a Matrix client for extra network‑level privacy while using open‑source messaging.