100% on-device · built on Chrome AI

Your AI pair for every word
you write.

Select text in any field and a small toolbar appears — rewrite, expand, shorten, or change tone in one click. It all runs on your device, so nothing you write ever leaves the browser.

Add to Chrome — Free Try it right here ↓
  • No account
  • No API keys
  • Native undo
app.example.com · new post

Sharing a few thoughts after this week's release.

the new dashboard makes reporting so much faster now
Pick an action above — it's a live preview, your text only changes on Replace.

Four actions, zero context-switching

Four ways to make it better

One toolbar handles the whole edit — no copying into another tab, no sidebar to babysit.

Rewrite

Rephrase a line or a paragraph into something clearer and sharper.

can u send me the file when u get a sec → Could you send me the file when you have a moment?

Expand

Turn a quick note into a full, well-formed paragraph.

ship date slipped, sorry → a complete, considerate update with the new date and next steps.

Shorten

Cut the fluff while keeping your meaning intact.

I just wanted to quickly reach out and check… → Quick check-in:

Tone

Switch between Professional, Casual, Friendly, Persuasive, and Formal in one tap.

ProfessionalCasualFriendlyPersuasiveFormal

Email replies

One click drafts a reply that actually read the thread.

On Gmail and other webmail, the AI Reply button writes a response that understands the conversation — you preview, then send.

An AI Reply button on a webmail compose box, ready to draft a reply to the thread above it.

Works where you write

If it's a text field, WritePair is there.

Plain inputs, rich editors, even fields tucked inside iframes and shadow DOM. WritePair inserts text through each site's own editing pipeline, so native undo keeps working.

Private by design

Your words never leave the browser.

Generation runs locally through Chrome's built-in models. There's no server to send your text to — because there's no server.

On-device AI

Runs entirely on Chrome's built-in Gemini Nano models — no cloud round-trip.

Zero data sent

No network calls for AI, no servers, no API keys. Analytics are off by default and local-only.

No account

Install and start writing. Privacy Mode marks sensitive pages fully off-limits.

How it works

Four steps, all inside the field.

  1. 01

    Select

    Highlight any text, on any site.

  2. 02

    Choose

    Pick rewrite, expand, shorten, or a tone.

  3. 03

    Preview

    See the suggestion inline before anything changes.

  4. 04

    Replace

    Swap it in or regenerate. Native undo still works.

Write better. Write faster. Write together.

Add to Chrome — Free

Works in recent versions of Chrome with built-in AI. On first use, Chrome downloads the on-device model once.