Tandem Browser

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Score7.0

Rank#7 of 23

PriceFree

Free planYes

Runs onAPI, Linux, macOS, Windows

Summary

Tandem Browser is an open-source, local-first browser that lets AI agents work through the user's browser session, including tabs, cookies, and the DOM. Agents can access the accessibility tree, rendered page structure, network requests, console output, and DevTools. If an agent encounters a CAPTCHA, an unclear form, or a decision needing human judgment, it pauses and asks the user for help. MCP- or HTTP-speaking agents can connect locally or remotely over a private Tailscale network, with separate workspaces and tab locks to avoid conflicts. Its API documentation lists more than 280 HTTP endpoints and 257 MCP tools, using bearer-token authentication. The maker says Tandem has no cloud backend, subscription, or telemetry, and that browsing data stays on the user's machine unless shared elsewhere. It can run offline with a local model such as Ollama or LM Studio. The free MIT-licensed browser is in developer preview and supports macOS Apple Silicon, Windows 11 x64, and Linux on a best-effort basis. It also lists workspaces, extensions, bookmarks, history, a local password vault, and sidebar apps including Telegram, WhatsApp, Discord, Slack, Gmail, Calendar, Instagram, and X.

Who it is for

Tandem Browser is aimed at AI power users, MCP builders, privacy-minded operators, and teams exploring browser agents. It may also suit users who want local browser data handling and can work with a developer-preview product.

What is good

Open source under the MIT license.
No cloud backend, subscription, or telemetry, per maker.
Agents can pause for user help.
Supports offline use with a local model.
Includes browser workspaces, extensions, and bookmarks.

What to know first

The product is in developer preview.
Linux support is best-effort.
Support is directed to GitHub Discussions and issues.

Verdict

Tandem Browser connects agents to a local browser session while leaving control with the user for difficult steps. Its developer-preview status and best-effort Linux support are worth considering.

Tandem Browser plans and pricing

All plans

Free Free Free and open source · no subscription tandembrowser.org · 30 Sept 2026

Compared on AI browsers

Free plan: Yestandembrowser.org
Page summaries: Yestandembrowser.org
AI research mode: Yestandembrowser.org
Browser agent: Yestandembrowser.org
Supported platforms: macOS Apple Silicon, Windows 11 x64, Linux (best-effort)tandembrowser.org
Browser engine: chromiumtandembrowser.org
Privacy model: localtandembrowser.org

Facts

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 · 30 Sept 2026
License and stage: The site identifies Tandem Browser as MIT licensed and in developer preview.tandembrowser.org · 30 Sept 2026
Page access: Agents can work with the accessibility tree, rendered DOM, network requests, console output, and DevTools.tandembrowser.org · 30 Sept 2026
Human handoff: When an agent encounters a CAPTCHA, unclear form, or judgment call, it pauses and asks the user for help.tandembrowser.org · 30 Sept 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 · 30 Sept 2026
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 · 30 Sept 2026
API: The API page documents more than 280 HTTP endpoints and 257 MCP tools, with bearer-token authentication.tandembrowser.org · 30 Sept 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 · 30 Sept 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 · 30 Sept 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 · 30 Sept 2026
Platforms: The FAQ lists macOS Apple Silicon and Windows 11 x64 as supported, with Linux described as best-effort; it says macOS builds are signed and notarized while Windows builds are unsigned.tandembrowser.org · 30 Sept 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 · 30 Sept 2026
Sidebar integrations: The repository lists Telegram, WhatsApp, Discord, Slack, Gmail, Calendar, Instagram, and X as sidebar apps.github.com · 30 Sept 2026
Support: The maker directs users to GitHub Discussions for questions and troubleshooting, and GitHub issues for bugs and concrete feature requests.github.com · 30 Sept 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 · 30 Sept 2026