🔒 Private & secure · Bring your own AI

Type like a goblin.
Send like a pro.

Spelling and grammar are checked privately and securely, as you write. Your words are never sent to a server and never seen by anyone but you. No account, no key needed. Add your own AI later for rewrites, tone, and translation.

Spelling & grammar

Fixes as you type, kept private.

Quillin underlines spelling and grammar while you write. Hover a squiggle to see the fix. No key, no account, nothing sent anywhere.

Grammar

teh → The

This sentence does not start with a capital letter.

Apply+ Dictionary

Spelling

acros → across

Did you mean to spell ‘acros’ this way?

Apply+ Dictionary

Built in for English, no key needed: American, British, Canadian, Australian, and New Zealand spelling.

With your own key

Unlock the full checker.

Add an API key and the same as-you-type checking does two bigger things.

✍️

Whole-sentence corrections

Go past single words. Quillin rewrites the entire sentence for clarity and shows the change before you accept it.

we was gonna meet up but it got to late → We were going to meet up, but it got too late.

🌍

Every language, not just English

Check spelling and grammar in whatever language your LLM supports, with the same squiggles and one-click fixes.

quiero un caffe con leche porfavor → Quiero un café con leche, por favor.

Rewrite in any tone · with AI

Same message, any voice.

Select your text and open the rewrite popup, the quickest way is the feather icon that appears in a text box. Quillin drafts it in each of your styles, and you pick the one you want.

Set your own styles in settings. Professional, Concise, and Pirate come ready; swap in Spicy, Lawyer-speak, Gen Z, whatever you reach for most.

Bring your own key

Add an API key for even more.

One key unlocks rewrites, tones, and translation, English into another language, or another language back into English, right where you’re typing. You pay your provider directly, usually pennies, and Quillin never takes a cut.

Claude GPT Gemini Grok Mistral Groq Ollama

Your AI, your rules · with AI

Make every AI check sound like you.

Set standing instructions once and they ride along on every AI rewrite and check, so you don’t repeat yourself.

Example“Write for a non-technical audience.”

Example“Keep sentences under 20 words, and never use exclamation points.”

Regional English spelling is already handled on-device under Primary language, so you don’t need to put it here.

The editor

A scratchpad with your AI built in.

Open the editor from the toolbar to pick your default model, then paste in any text to rewrite its tone or translate it, without touching the page you’re on.

Quillin’ editor Model: Claude Haiku ▾

Paste a paragraph here, pick a tone or a language, and Quillin hands back a clean version.

✨ Rewrite ▾ 🌐 Translate ▾

The quickest way

Look for the feather.

Whenever you’re typing in a text box, a little feather tucks into the corner. Press it and your rewrite styles pop up, no highlighting, no right-click.

Can you send me the deck when you get a sec? Quillin feather

Press it, and your styles appear:

Professional Concise Pirate

Any text, anywhere

Or right-click any text.

No feather in the box, or want to rewrite or translate text that isn’t in a text box at all? Highlight any text on any page, right-click, and choose an action.

Please find attached the documents you requested for review.

You’re in control

Pause it anywhere. Then go write.

Click the Quillin icon for quick actions, and pause it on any site for an hour, the day, or until you switch it back on.

That's the tour. Quillin’ is invite-only right now while it's in beta.

The same welcome you'd get in the extension.

Type like a goblin.Send like a pro.