FREEDOM251

Freedom251 › Tool Agents

Tandem Browser

Free plan APILinuxMacWindows

Visit Tandem Browser Alternatives Pricing

Tandem Browser's own site

What Tandem Browser is

Tandem Browser is a free, open-source browser built around AI agents working in the user’s browser session. Agents can interact with tabs, cookies, and page structure, including accessibility information, rendered DOM, network requests, console output, and DevTools. When an agent reaches a CAPTCHA, an unclear form, or a decision that needs judgment, it pauses and asks the user. MCP- or HTTP-speaking agents can connect locally or remotely over a private Tailscale network, with separate workspaces and tab locks. Its API documentation lists more than 280 HTTP endpoints and 257 MCP tools, with bearer-token authentication. The browser includes workspaces, extensions, bookmarks, history, a local password vault, and sidebar apps such as Telegram, WhatsApp, Slack, Gmail, and Calendar. The maker says there is no cloud backend, subscription, or telemetry, and browsing data stays on the user’s machine unless shared. It can work offline with a local model. Tandem is MIT licensed and in developer preview; platform support includes macOS Apple Silicon, Windows 11 x64, and best-effort Linux.

Who it suits

Tandem suits AI power users, MCP builders, privacy-minded operators, and teams exploring browser agents. It is also aimed at users who want local browser data handling or to work with a local model offline.

What it does well

  • Free and open source, with no subscription.
  • Agents can access page structure and DevTools.
  • Separate workspaces and tab locks for agents.
  • Offline use with a local model is supported.
  • Includes a local password vault and sidebar apps.

What to know first

  • The product is in developer preview.
  • Linux support is described as best-effort.
  • Agent handoffs require user help for some decisions.

Plans

PlanBilled and limitsPrice
FreeFree and open source · no subscriptionFree

As tandembrowser.org lists them, read 30 Sept 2026. The maker's own page has the final word.

Getting started

  1. Visit the Tandem Browser website.
  2. Install it on macOS Apple Silicon, Windows 11 x64, or Linux.
  3. Connect an MCP- or HTTP-speaking agent, such as Claude, GPT, Gemini, Ollama, or a custom script.
  4. Use a local model such as Ollama or LM Studio for offline operation.
  5. For questions or troubleshooting, use GitHub Discussions; report bugs and concrete feature requests through GitHub issues.

Verdict

Tandem combines a daily-use browser with tools for connecting and managing AI agents. Its developer-preview status and best-effort Linux support are worth considering before adopting it.

Questions

How much does Tandem Browser cost?

It is free and open source, with a listed plan price of $0 and no subscription.

Which platforms does it support?

The listed platforms are macOS Apple Silicon, Windows 11 x64, and Linux on a best-effort basis.

Can it work offline?

Yes. The FAQ says it can run fully offline with a local model such as Ollama or LM Studio.

Which AI agents can connect?

The maker says MCP- or HTTP-speaking agents can connect, including Claude, GPT, Gemini, OpenClaw, Ollama, LM Studio, and custom scripts.

Where does Tandem keep browsing data?

The maker says there is no Tandem Browser cloud backend or telemetry, and browsing data stays on the user's machine unless they choose to send it elsewhere.

What license does Tandem use, and what stage is it at?

The site identifies it as MIT licensed and in developer preview.

Facts from Tandem Browser's own pages

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
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
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
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
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
License and stage
The site identifies Tandem Browser as MIT licensed and in developer preview. · 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
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
Page access
Agents can work with the accessibility tree, rendered DOM, network requests, console output, and DevTools. · 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
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
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
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

Where Tandem Browser stands on Freedom251

Look at these too