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Introducing

Sheaf

A browser for development teams. The tools you already install — built in, and written from scratch.

An animation in which four tool sheets — Letterhead, Folio, Imprint and Mailroom — drift together and bind into a single browser window.

Stop juggling extensions

One window. No permission prompts.

Free and open source. No account, no telemetry, no network calls of its own.

Download See the tools

The tools, built in

Each one written from scratch and scoped to a browser you only use for development.

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Letterhead

Add, replace or remove request & response headers, scoped by substring, glob or regex. Profiles swap whole sets.

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Folio

Any JSON becomes a searchable tree with copy-path on every key. Paste-anything scratchpad included.

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Imprint

Read and edit cookies — including HttpOnly — plus localStorage and sessionStorage for the current origin.

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Mailroom

Stub, redirect, block or delay requests. Record the session and export a HAR to attach to a ticket.

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Docked DevTools

The real Chrome panels — Elements, Console, Network, Sources — docked in the window and resizable.

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Device simulation

Preset or custom device profiles resize the viewport and swap the user agent — alongside DevTools.