# Tandem Browser

> Tandem Browser is the open-source, local-first browser for AI agents — where the AI lives inside your real browser session, bring any model via MCP.

Tandem Browser is a Chromium-based desktop browser built for one job: letting AI agents and a human work together inside the same browser session. It supports macOS Apple Silicon and Windows 11 x64, with Linux available on a best-effort basis. Windows builds are official Tandem Browser downloads but currently unsigned. The agent sees the same tabs, cookies, accessibility tree, network log, and DOM that the human sees. There is no per-site API, no headless second browser, and no screenshot loop — the agent operates the real browser the human is already using. This makes Tandem Browser the symbiotic browser: human and AI sharing one real session, neither in control alone.

## Origin

Tandem Browser was started by Robin Waslander (the maintainer of OpenClaw, https://github.com/hydro13/openclaw) as a way to give OpenClaw agents the real web to work on. The first versions targeted the OpenClaw community specifically. It later opened up to any AI agent that speaks MCP or HTTP, including remote agents over Tailscale.

## Key facts

- License: MIT (open source)
- Author: Robin Waslander (independent, no company, no VC)
- Repository: https://github.com/hydro13/tandem-browser
- Website: https://tandembrowser.org
- Current version: 1.11.0 (developer preview)
- Architecture: local-first, no cloud backend, optional remote agent connection over Tailscale/private overlay networks
- Agent API: configurable port, default 8765; local clients use 127.0.0.1 plus the configured port, remote agents use the Tailscale/private-network address plus the configured port
- Agent surface: 250+ MCP tools, 300+ HTTP endpoints
- Security: 8-layer pipeline (NetworkShield, OutboundGuard, ContentAnalyzer, ScriptGuard, BehaviorMonitor, Gatekeeper AI, EvolutionEngine, PromptInjection)

## What makes Tandem Browser different

Other "AI browsers" (Comet, Dia, Arc Search) bundle a single vendor model and ship cloud-hosted features. Tandem Browser is open source, local-first, and model-agnostic — it works with Claude, GPT, Gemini, OpenClaw, Ollama, LM Studio, and anything speaking MCP or HTTP. As an MCP-native browser, it runs the agent inside the same authenticated session the human uses — not a separate headless instance. This is the human-AI symbiotic browser model: the agent is not a sidebar, it is inside the real browser alongside you.

## Compatible AI agents

Tandem Browser is model-agnostic and MCP-native. Any agent that speaks MCP (Model Context Protocol) or HTTP connects without glue code — including Claude, GPT, Gemini, OpenClaw, Ollama, LM Studio, and custom scripts. Swap models, combine models, or run fully offline with a local model.

## Pages

- [Home](https://tandembrowser.org/): overview, what Tandem Browser unlocks, security stack, getting started
- [API documentation](https://tandembrowser.org/api): full HTTP and MCP tool reference
- [Tandem Browser vs WebMCP](https://tandembrowser.org/tandem-browser-vs-webmcp): positioning relative to the WebMCP proposal
- [Sponsor](https://tandembrowser.org/sponsor.html): support tiers
- [GitHub](https://github.com/hydro13/tandem-browser): source code, releases, issues
- [Discussions](https://github.com/hydro13/tandem-browser/discussions): community Q&A