Type like a goblin.
Send like a pro.
Spelling and grammar are checked privately on your own device, as you type. Your words never leave the browser. Then plug in your own AI key and the same little quill will rewrite in any tone, translate both directions, and fix whole sentences at once, on the model you already pay for.
right now
Right-click any text on any page, pick a voice, drop it back in. That's the AI half. There's also a quiet on-device half that never leaves your machine.
Spelling & grammar, checked on your device.
Quillin’ ships with an on-device English checker that reads what you're typing right in the browser. Squiggles show up under typos and grammar slips, one-click fixes drop in. Your words never touch a server, an account, or an AI. No key, no signup, nothing to leak.
+ With your own AI key, the same as-you-type checker gets a bigger brain: it corrects whole sentences at once and works in every language your model supports, not just English.
Watch it once. Then you'll get it.
A feather in your text box, or a right-click anywhere.
Same rewrites, tones, and translations. Pick whichever way suits the moment.
The feather, in any text box
Start typing in a comment, an email, a chat box, and a little feather tucks into the corner. Tap it and your saved styles pop up. No highlighting, no menu.
Right-click any text on any page
Not in a text box, or want to rewrite something you're just reading? Highlight it, right-click, and pick I be Quillin’ this or Translate to….
Pick a voice, hit Use this
Your styles come back side by side. Pick one and it drops into the box. Undo like nothing happened.
The toolbar popup runs the show.
You won't live here, but it's where you set things up. Open it from your toolbar to:
i before e, except here
Bring your own brain.
No Quillin’ subscription and no markup. Connect the providers you already use and switch models any time, and the popup remembers your pick.
Your keys, and your text, never leave your device.
The on-device checker runs in the browser, and API keys sit in local storage and go straight to each provider when you ask for a rewrite. There's no Quillin’ server in the middle, so there's nothing to harvest and nothing to leak. You pay your provider directly, usually pennies, and Quillin’ never takes a cut.
One text, any voice.
A stack of built-in tones ships ready to go, and you can write your own. Run that stressful email to HR through Unhinged and Victorian Offended until you're laughing instead of spiraling, then send the professional one. From the boardroom to complete nonsense, your call.
Type it your way. Send it in theirs.
Same right-click, same little quill, just pointed at a different language this time. Select any text and translate it into or out of 30+ languages your AI supports, both directions, with real regional flavor: Latin American vs. Spain Spanish, Simplified vs. Traditional Chinese. A few are just for fun.
Three go-to styles. Plus your house rules.
Keep three rewrite styles one right-click away, the voices you reach for daily. Then set standing instructions that quietly apply to every check.
• Write at a 9th-grade level
• Non-technical audience
• Canadian spelling
One Quillin’, more places to use it.
Same styles, same keys, same questionable sense of humor. Starting in the browser, with more on the way.
Browser extension
Right-click rewrites on any web page, plus the popup for models, settings, and translation.
Mac app
A full Mac app, not a plugin: the same rewrites and styles anywhere you type on your Mac, a keystroke away. No browser required.
Windows? If enough people ask nicely.
No subscription. Tips welcome.
Quillin’ is a personal project, free during the beta. If it saved you from hitting send too fast, there are a few ways to say thanks.
☕ Ways to support Quillin’