Double – Coding Copilot

Double is an AI coding copilot delivered as a Visual Studio Code extension. It puts a chat assistant in the editor sidebar alongside tab autocomplete, inline edits and a one click way to apply generated code, with a focus on speed and on getting small interaction details right. The company is backed by Y Combinator. It is built for developers who want a lightweight assistant inside VS Code. Chat is tuned to give concise, code first answers, and developers control context by highlighting the exact lines they want the model to consider, for example to generate tests, add comments or explain a function. CodeSnap applies a snippet from chat directly into the file without copying and pasting. Inline Edit, still in preview, lets users command, review and apply changes in place. Custom Instructions shape the style of replies, chat history is organized chronologically, and keyboard shortcuts cover the main actions. Users choose between frontier models from OpenAI and Anthropic in the extension settings, and the documentation states that new models are added the day they are released. Double offers a free trial in VS Code and a paid Pro subscription, with 20 percent off annual plans under a fair use policy that allows unlimited use by individuals but no bots, automation or account sharing. The documentation's pricing page does not show plan amounts in readable text, and enterprise pricing is available by email. Only VS Code is supported; JetBrains, Neovim and other editors are on a waitlist. The public changelog was last updated in February 2025 and the documentation still references 2024 model versions, so buyers should confirm the product is actively maintained.