Codayak

Codayak is a free Windows desktop AI coding workbench for .NET teams. It scopes a change's impact, writes and builds code, runs tests and SQL, and reports a confidence-scored trust band using your own LLM provider keys.

Codayak is a desktop AI coding assistant for Windows, made by Techniche Labs in Queensland, Australia, and aimed at .NET development teams. It reads an entire repository, maps the projects, types and dependencies in a solution, and shows what a proposed change would touch before any file is edited. From a plain-language request it writes or patches code, builds it, runs the tests and reports back with a diff and evidence rather than a bare answer. The distinguishing feature is the Trust Engine. After generation it builds the output, runs tests, performs a security scan and, when a specification is supplied, checks that required features are present. The result is a trust band (High, Moderate or Low), a 0-100 score and per-checker evidence, saved to the repository as an audit trail. Edits are surgical rather than whole-file rewrites, every write is backed up and shown in a side-by-side diff, and writing stays off until the Write to Repo switch is enabled. In practice the app runs locally and calls whichever model the user has configured. Seven cloud providers are supported (Anthropic, OpenAI, xAI, Google, MiniMax, Moonshot and Zhipu), along with any OpenAI-compatible endpoint such as Ollama, LM Studio or vLLM, so costs are the provider's own token rates with no reseller in between. Tools run on the machine: MSBuild and dotnet builds, SQL against five database engines, a real Chrome browser, and WPF, WinForms or Win32 apps through UI Automation. It also reviews pull requests on Azure DevOps and GitHub, and can coordinate several instances over a LAN as a planner, coder and reviewer team. Among alternatives, Codayak sits closer to an agentic workbench than to an editor plugin: it works alongside Visual Studio and is not an editor itself. It handles other languages too, though build, test and verification features are tuned for .NET. It is Windows-only, free for personal and commercial use under a proprietary freeware licence, and not open source.