Native browser runtime for software agents

A browser built
for agents

Rel is a native macOS browser crafted for persistent Chromium sessions and direct collaboration with software agents.

Get Rel ↓Read docs

Available for macOS

Native

Rel.app owns the bundled Chromium runtime, rendered directly on your Mac.

Agentic

Capture, attach, and act through one local CLI, Rust SDK, and versioned RPC.

Isolated

Every tab keeps its own browser identity, storage, cache, and network route.

Rel

Agent ready

TerminalInfoFiltersLogs⌘J

❯rel capture example.com --session-id machine-…Session1

capture.page_ready 200418ms

capture.completed 84.2 kBoutput.html

One installed app.One supported path.Visible to you and your agents.

The browser, made programmable

Rel just works

Powerful from the first capture. Predictable on the ten-thousandth.

Persistent sessions

Give every agent a stable browser identity that survives captures, actions, and app restarts.

Learn more

Per-session routes

Use direct networking or assign a dedicated upstream proxy without exposing credentials to Chromium.

Rendered capture

Load the real page, run canonical actions, and save final HTML after Chromium is ready.

rel capture example.com \\ --action '{"action":"click",…}'

capture.started

capture.page_ready 200

capture.completed 84.2 kB

Your interface, your choice

Agent access that fits the way you work

Start with the command line. Move to the typed Rust client or local RPC when your workflow needs deeper control. Every interface reaches the same supervised browser runtime.

Read the documentation

CLIRust SDKRPC v1Local · 17319

1rel capture https://example.com \\

2 --output captures/example.html \\

3 --wait 1 \\

4 --action '{"action":"click","selector":"button.more"}'

capture.startedSession21

capture.browser_requestedexample.com

capture.page_ready200 · 532ms

capture.completed84.2 kB

✓ Finished with exit code 0 1.14s

A deliberately narrow architecture

Built with ultimate care

One supported runtime makes failures visible, behavior consistent, and agent automation easier to trust.

01App-owned ChromiumRel.app is the only CEF owner 02Versioned local RPCStructured envelopes and stable error IDs 03Agent-owned proxiesCredentials stay out of Swift and CEF 04Private browser identityOne context and storage directory per tab

Agents should not pretend to browse. They should operate a real browser—with visible state, durable identity, and a human close enough to understand what happened.

Rel keeps that browser local, inspectable, and intentionally boring at the boundaries. One app owns Chromium. One agent owns automation. Every request follows the same path.

Rel · built for agents and the people supervising them

Start with one command

Give your agents
a real browser