Soul-of-Waifu
Free, open-source AI companion app for Windows with offline GGUF models, voice chat, persistent character memory and optional cloud APIs.
Soul-of-Waifu is a free, open-source Windows app for people who want AI characters with a shared identity across conversations, roleplay campaigns and a desktop companion. A character's personality and memories carry between these modes, so a campaign and a casual chat can draw on the same history.
Each character keeps a personal diary and a relationship profile that adapts its behavior to past interactions. The memory system tracks mood and shared events, corrects contradictions and merges duplicate memories. Text and voice chat support Live2D and VRM avatars, lip sync and voice cloning. Lorebooks supply story context, and the app imports PNG and JSON character cards.
Soul Stage adds an AI Game Master for group text RPGs, with dice rolls, inventory, world state and hidden story arcs. Soul Companion places an avatar on your desktop that can read the screen and clipboard, start conversations and use tools. Its desktop agent can control the mouse and keyboard, browse the web, run code and organize files, with an on-screen approval system for risky actions. Python plugins and MCP servers extend its abilities.
Local LLM use runs through a built-in llama.cpp server with GGUF models and NVIDIA, AMD and Intel acceleration. Chats can stay entirely offline on your PC without an account; optional cloud APIs include Claude, OpenAI and Gemini, while web tools require internet access. The app uses the GPL-3.0 license and requires 64-bit Windows 10 or 11 and 16 GB RAM, with 32 GB recommended. An NVIDIA or AMD GPU is highly recommended.
