Refact.ai

Refact.ai is an open-source AI coding assistant by Small AI Labs (SmallCloud) built around a local-first Rust engine (refact-lsp) with VS Code and JetBrains plugins. It combines real-time code autocompletion, in-IDE chat with Quick, Explore, and Agent modes, and an autonomous agent that plans and executes multi-file tasks with project-aware retrieval-augmented generation, shell execution, and MCP tool integrations.

Its defining trait is data sovereignty: the engine runs locally or on your own infrastructure, models can be self-hosted open-weight models (or your own API keys via BYOK), and team-specific fine-tuning on your codebase is a first-class feature. The project is BSD-3-Clause licensed with around 3.5k GitHub stars, and Refact markets strong SWE-bench Verified results — though those numbers depend on the model and harness together rather than Refact alone.

Limitation: as a smaller open-source project it lacks the polish and ecosystem of Copilot or Cursor, and enterprise features like the self-hosted server need your own GPU infrastructure. The marketed benchmark leadership should be treated as vendor-claimed until independently reproduced.

Install the VS Code or JetBrains plugin, or self-host the engine via Docker with your own models.