Flecha

Flecha is an open-source Chromium browser for developers that features Spaces, a command bar and a coding agent bridge.

Flecha is an open-source Chromium browser built specifically for developers on macOS. It features a vertical sidebar, Spaces, a developer command bar that decodes tokens and Unix times, and a built-in MCP bridge that lets coding agents like Claude Code and Cursor read and drive your tabs. Everything stays locally on your Mac with no account or telemetry required. The browser supports Chrome extensions and Google sign-in, while offering unique developer tools like local dev server integration, environment switching for local, staging, and production, and custom TypeScript or CSS Boosts. It also includes split view, separate login sessions per Space, and built-in ad and tracker blocking.

Flecha at a glance

Best for: Software engineer
Runs on: macOS
Pricing: Free and open source
Released: October 2026
Category: AI coding tool
Website: flecha.dev

Key features

Vertical sidebar and Spaces
Developer command bar
Model Context Protocol bridge for coding agents
Local dev server integration
Environment switching
Custom CSS and TypeScript Boosts
Split view and Peek previews
Built-in ad and tracker blocking

Use it for

Navigate between local, staging, and production environments
Allow coding agents to read pages, take screenshots, and run JavaScript
Test multiple user accounts side by side with separate cookie jars
Run local development servers directly inside the sidebar
Decode tokens and Unix times locally in the command bar

Alternatives to Flecha

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Rill Browser — Runs on your existing AI plans with automatic project detection.
Agent Chrome Relay — Runs in background tabs using real logins without stealing browser focus.
Skisso — Generates exact CSS and text diff patches for coding agents directly from the browser
Chrome DevTools MCP — Enables coding agents to interact directly with a real browser instance.
Muster — Manage multiple AI coding sessions without switching app windows.
Devbroom — Sorts leftover agent files by evidence and moves them safely to the trash.
Bama — Rebuilds any macOS app and automates the entire development process.
Arc Browser Use — Fixes connection stalls between Codex and Arc by patching the ChatGPT Chrome extension.
Quotio — It unifies multiple AI provider accounts and tracks quotas in one dashboard.

All Flecha alternatives