Psi+ icon

Psi+

Psi+ is a robust, cross-platform XMPP/Jabber client tailored for users who prioritize control, privacy, and extensibility. As a development branch of the classic Psi client, it offers advanced features for secure and customizable instant messaging.

http://psi-plus.com/

License

Open Source

Platforms

Mac OS X Windows Linux BSD

About Psi+

Psi+ stands out as a premier XMPP/Jabber client, meticulously crafted for the discerning user. Unlike many mainstream messaging applications, Psi+ provides a decentralized communication experience built upon the open XMPP protocol. This commitment to open standards fosters greater privacy and flexibility.

Key capabilities include:

  • Secure Communication: Leveraging XMPP's inherent security features, Psi+ further bolsters your conversations with support for end-to-end encryption protocols like OTR (Off-the-Record).
  • Rich Multimedia Support: Beyond standard text chat, Psi+ allows for voice and video calls, including screen sharing capabilities. This makes it suitable for both personal and professional communication needs.
  • Extensibility: A significant strength of Psi+ is its extensibility through a comprehensive plugin system. This allows users to tailor the client to their specific needs, adding features and integrations not available out-of-the-box.
  • Customization: Users have extensive control over the look and feel of the client with built-in themes and customizable interface elements.
  • Multi-Protocol Potential: While primarily an XMPP client, its architecture and plugin support allow for potential integration with other messaging protocols, offering a unified communication hub for those willing to explore its capabilities.
  • Cross-Platform Availability: Psi+ is available on multiple operating systems, ensuring a consistent experience regardless of your preferred platform.

Psi+ is ideal for users who value privacy, control over their data, and a highly customizable messaging experience. Its focus on the open XMPP standard makes it a solid choice for those looking to move away from centralized, data-hungry platforms.

Pros & Cons

Pros

  • Strong focus on privacy and security with OTR support.
  • Decentralized communication using the open XMPP protocol.
  • Highly extensible through a comprehensive plugin system.
  • Includes voice and video calling capabilities.
  • Cross-platform availability.

Cons

  • Can have a steeper learning curve for new users.
  • Interface may feel dated compared to modern messengers.
  • Reliance on XMPP means communication is limited to other XMPP users (unless plugins add other protocols).
  • Configuration of advanced features can be complex.

What Makes Psi+ Stand Out

Decentralized Communication

Based on the open XMPP protocol, Psi+ offers a decentralized alternative to centralized messaging platforms.

Privacy-Focused Design

Emphasis on user privacy with support for strong encryption and control over personal data.

Highly Extensible

The extensive plugin system allows users to add features and customize the client significantly.

Power User Oriented

Designed with advanced users in mind, offering fine-grained control and configuration options.

Features & Capabilities

12 features

Expert Review

Psi+ Software Review

Psi+ is a long-standing and respected XMPP/Jabber client, carving out a niche for users who demand more control, privacy, and customization than mainstream messaging applications typically offer. As a development branch building upon the solid foundation of the original Psi client, Psi+ continues to evolve, providing a powerful and flexible platform for decentralized communication.

One of the most significant aspects of Psi+ is its unwavering commitment to the XMPP standard. In an era dominated by proprietary messaging silos, Psi+'s reliance on an open protocol is a breath of fresh air. This allows users to choose their server provider, self-host if they desire, and communicate with anyone else on the XMPP network, fostering true interoperability and reducing vendor lock-in. For users concerned about their data residing on centralized servers, this decentralization is a key advantage.

Security and privacy are paramount for Psi+. The client supports essential security features like OTR (Off-the-Record Messaging), providing robust end-to-end encryption for confidential conversations. While implementing these features can sometimes require a bit more configuration compared to 'out-of-the-box' encrypted messengers, the control and assurance they provide are invaluable for sensitive communications. Features such as integrated file sharing are also handled within the secure environment of the XMPP protocol, although the security of the file transfer itself can depend on the specific method and server implementation.

Beyond basic text chat, Psi+ includes built-in support for voice and video calls. This elevates it from a simple text-based client to a more comprehensive communication tool. The inclusion of screen sharing is a particularly valuable feature for collaboration, troubleshooting, or presentations, making Psi+ suitable for both personal chats and professional interactions where visual communication is necessary. Performance of these features can be dependent on network conditions and the capabilities of the XMPP server being used, but the functionality is present and generally reliable.

Where Psi+ truly distinguishes itself is in its extensibility and customization. The plugin architecture is a core strength, enabling users to extend the client's capabilities far beyond its default feature set. Whether it's integrating with other services (where plugins exist), adding advanced notification options, or tweaking the interface, plugins offer a high degree of flexibility. This makes Psi+ appealing to technical users or those with specific workflow requirements that are not met by simpler clients. Customization of the user interface through themes and layout options further allows users to personalize their messaging experience.

While the emphasis on power features and customization is a significant advantage, it can also present a steeper learning curve for users accustomed to more streamlined, opinionated applications. Setting up and configuring advanced features or plugins may require some technical understanding. The interface, while customizable, can feel slightly dated compared to modern consumer-focused applications, though this is largely subjective and addressable through themes.

The community around Psi+ is often focused on development and advanced usage, which can be beneficial for finding solutions to complex issues but might not be as immediately welcoming to complete beginners as communities around more popular messengers. The development branch aspect of Psi+ also means that users are interacting with a project that is actively being worked on, which can lead to new features and improvements but also occasional bugs or changes that require adaptation.

In conclusion, Psi+ is a highly capable XMPP client best suited for users who prioritize privacy, security, and control over their communication platform. Its decentralized nature, robust feature set including voice/video calls and screen sharing, and extensive plugin support make it a powerful tool. While it may require more effort to set up and configure compared to simpler alternatives, the benefits of a customizable, privacy-respecting, and open-standard-based messenger make Psi+ a compelling choice for its target audience.

Screenshots

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