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Tandem Browser
What it is
Tandem Browser is a free, MIT-licensed, open-source browser in developer preview that lets AI agents operate inside a local browser session. Agents can use tabs, cookies, the DOM, accessibility information, network requests, console output, and DevTools. If an agent reaches a CAPTCHA, unclear form, or judgment call, it pauses for user help. MCP- or HTTP-speaking agents can connect locally or through a private Tailscale network, with separate workspaces and tab locks. Its documented API includes more than 280 HTTP endpoints and 257 MCP tools with bearer-token authentication. The maker says there is no cloud backend, subscription, or telemetry, and browsing data stays on the machine unless shared. Tandem can run offline with Ollama or LM Studio. It includes workspaces, extensions, bookmarks, history, a local password vault, and sidebar apps. Supported platforms are macOS Apple Silicon, Windows 11 x64, and Linux on a best-effort basis.
For and against
For
- Open-source MIT license
- No cloud backend, subscription, or telemetry
- Supports MCP and HTTP agent connections
- Offline use with local models
- Includes workspaces and tab locks
Against
- Still in developer preview
- Linux support is best-effort
- Windows support listed for Windows 11 x64
- Agent work may require human handoff
The verdict
Tandem Browser combines agent access with a local privacy model and broad integration options. Its developer-preview status and best-effort Linux support matter when planning deployment.
Who it suits
Tandem Browser fits AI power users, MCP builders, privacy-minded operators, and teams exploring browser agents. It is also suited to users who want local or offline operation.
Plans and prices
Free
Free and open source · no subscription
Read 30 Sep 2026 · tandembrowser.org
On the record
- Agent connections
- Agents can connect on the same machine or remotely over a private Tailscale network; each agent can have its own workspace, with tab locks to prevent conflicts.tandembrowser.org · read 30 Sep 2026
- API
- The API page documents more than 280 HTTP endpoints and 257 MCP tools, with bearer-token authentication.tandembrowser.org · read 30 Sep 2026
- Audience
- The maker describes the product as aimed at AI power users, MCP builders, privacy-minded operators, and teams exploring browser agents.tandembrowser.org · read 30 Sep 2026
- Browser features
- The maker lists workspaces, extensions, bookmarks, history, a local password vault, and sidebar apps among its daily-driver browser features.github.com · read 30 Sep 2026
- Data handling
- The FAQ says there is no Tandem Browser cloud backend, subscription, or telemetry, and that browsing data stays on the user's machine unless they choose to send it elsewhere.tandembrowser.org · read 30 Sep 2026
- Human handoff
- When an agent encounters a CAPTCHA, unclear form, or judgment call, it pauses and asks the user for help.tandembrowser.org · read 30 Sep 2026
- License and stage
- The site identifies Tandem Browser as MIT licensed and in developer preview.tandembrowser.org · read 30 Sep 2026
- Model integrations
- The maker says agents that speak MCP or HTTP can connect, including Claude, GPT, Gemini, OpenClaw, Ollama, LM Studio, and custom scripts.tandembrowser.org · read 30 Sep 2026
- Offline use
- The FAQ says Tandem Browser can run fully offline when used with a local model such as Ollama or LM Studio.tandembrowser.org · read 30 Sep 2026
- Page access
- Agents can work with the accessibility tree, rendered DOM, network requests, console output, and DevTools.tandembrowser.org · read 30 Sep 2026
- Product
- Tandem Browser is an open-source, local-first browser where AI agents share the user's browser session, tabs, cookies, and DOM.tandembrowser.org · read 30 Sep 2026
- Security
- The maker describes an eight-layer security pipeline with an 811K-plus-entry blocklist, YARA-style rules, AST fingerprinting, entropy detection, and 51 automated tests.tandembrowser.org · read 30 Sep 2026
- Sidebar integrations
- The repository lists Telegram, WhatsApp, Discord, Slack, Gmail, Calendar, Instagram, and X as sidebar apps.github.com · read 30 Sep 2026
- Support
- The maker directs users to GitHub Discussions for questions and troubleshooting, and GitHub issues for bugs and concrete feature requests.github.com · read 30 Sep 2026
