10 Open Source Alternatives to WhatsApp

Session uses a decentralized network and advanced onion routing techniques to ensure that messages are sent without leaking metadata. It offers features such as voice messaging, group chats supporting up to 100 participants, and secure file attachments, all built on a fully open source framework. Designed to prevent data breaches and tracking, Session empowers users to communicate freely without leaving digital footprints.

Lokinet leverages a decentralized network of staked nodes to provide anonymous internet access. Traffic is onion-routed, ensuring that your browsing remains secure, private, and uncensored. The network is designed to hide your IP and the IPs of the sites you visit, making it an effective solution for evading surveillance and censorship. With native clients for Windows and Linux and ongoing developments for macOS and mobile, Lokinet integrates seamlessly with the applications you already use.

Snikket’s image builder streamlines the deployment of your personal messaging server on the system of your choice, whether it’s a hosted instance, a VPS, or even a Raspberry Pi. The server manages user accounts, supports multiple devices on a single chat account, and ensures reliable message delivery. Moreover, it facilitates communication with users on different Snikket servers by forming a global, federated network.

Speek enables secure, end-to-end encrypted messaging by creating a Tor hidden service on the user's device. Messages are routed through the Tor network, ensuring IP addresses remain hidden and no metadata is stored. With a decentralized structure requiring no phone number or identity verification, Speek also supports anonymous file sharing, making it ideal for sensitive conversations.

Built exclusively for Android users, Signal provides state-of-the-art encryption to safeguard every message and call. The application allows you to share texts, voice messages, photos, videos, and even custom stickers effortlessly. It supports crystal-clear voice and video calls and features group chats to keep you connected with friends, family, or colleagues—all without any ads or trackers.

Kontalk offers fully encrypted client-to-server and server-to-server channels, ensuring privacy and security for every user. It is based on rock-solid XMPP standards which guarantee interoperability with other services, and operates on a network managed by volunteers. The platform is perfectly optimized for mobile phones, using your phone number for instant identification among contacts.

CoyIM provides a straightforward chat experience with end-to-end encryption and built-in support for Tor, OTR, and TLS. The application minimizes the attack surface by offering only essential security features while avoiding plugins and excessive configuration. Available for Windows, Linux, and macOS, it maintains a clean and focused user interface for secure communication on the XMPP protocol.

Berty leverages a fully distributed, decentralized network to facilitate messaging without the need for SIM cards or internet connectivity. With end-to-end encryption enabled by default, your conversations are protected even in restrictive environments. The app supports Bluetooth Low Energy (BLE) for uninterrupted communication and offers simple ways to add contacts via QR codes, public keys, or invite links.

SchildiChat provides a modern messaging experience by leveraging the Matrix network and building on the solid foundation of Element. It comes with added enhancements and customizations that improve usability while retaining the open and decentralized features of Matrix. Available on Android, Desktop, and Web, this client meets the needs of users across a variety of devices.

SchildiChat provides a modern messaging experience by leveraging the Matrix network and building on the solid foundation of Element. It comes with added enhancements and customizations that improve usability while retaining the open and decentralized features of Matrix. Available on Android, Desktop, and Web, this client meets the needs of users across a variety of devices.