OpenSidekick — Bring-Your-Own-LLM Browser Agent

Open-source AI assistant that reads and acts on web pages using any model you choose. Your keys stay in your browser.

OpenSidekick puts an AI agent in your browser's side panel — one that can read the page you're on and act on it: click, type, fill forms, navigate, and work across tabs. Unlike closed assistants, you bring your own model. Connect a hosted model provider or run a local model on your own machine — your API keys stay in your browser and are sent only to the provider you choose. There is no OpenSidekick account, no middleman, and no telemetry. Not sure a model will work? A built-in Test button checks it for tool-calling and vision in one click. WHAT IT CAN DO • Summarize or answer questions about the current page • Extract information such as emails, prices, tables, or links • Fill in forms and click through multi-step flows • See the page when it needs to — vision is on by default for models that support it • Search, navigate, and work across multiple tabs to finish a task • Save prompts, schedule recurring tasks, and record and replay workflows • Connect Model Context Protocol (MCP) tool servers to extend what the agent can do PRIVATE BY DESIGN • Your keys and settings stay on your device • Requests go straight to the model provider you choose • No analytics, no tracking, no accounts • 100% open source (MIT) — read or fork the code on GitHub SAFE BY DEFAULT • One-click approval control: plan first, ask before acting, or auto • New sites ask before the agent acts; sensitive sites (banking, payments) always confirm • The agent won't bypass logins or CAPTCHAs — it hands those back to you Open source: https://github.com/esterhuizen/opensidekick