Developed by Double (double.bot), a Y Combinator-backed startup.

Double is an AI coding copilot for VS Code offering real-time autocomplete, chat, and access to multiple frontier models with custom-instruction personalization.

Distributed as a Visual Studio Code Marketplace extension.

Launched around 2024 and actively marketed and updated through 2026.

It exists to give developers fast, style-aware autocomplete plus a choice of the latest models in one lightweight extension.

Requires a Double account; model access (OpenAI o1, DeepSeek R1, Claude, Llama, etc.) is bundled rather than needing separate API keys.

Closed-source commercial product, free to try, code context is sent to Double's cloud, which routes to the selected third-party model provider.