Fix & Humanize
Cleans grammar and softens tone in one pass.
Chrome Writing Editor
For the five
For the five
seconds
before send
You know what you want to say. Serene makes sure it lands.
Rewrites the draft already on your screen. No tab switching. No copy-paste detour.
See how it works →Used daily by professionals who send a lot of messages
No credit card required. $9.99/yr after trial.
Edited, not generated
Right where you’re already typing
Serene reads the draft on your screen and offers a rewrite before you send. You keep the final say on every word.
Works where you already write
You review every rewrite
Your writing never reaches us
You review before replacing
mail.google.com
Fix & Humanize
Before
After
The problem
The almost-right message
Most writing problems aren’t grammar errors. They’re tone gaps — moments where the message lands differently than you meant.
01
“This sounds sharper than I meant.”
02
“I know what I want to say. I need it to land cleanly.”
03
“I am not pasting client details into another tool.”
Why not just use…
How Serene is different
vs.
Copy-paste into ChatGPT
You have to leave the page, strip out anything confidential, paste, copy back, reformat. By then, momentum is gone.
Serene works inside the text field. You never leave the draft.
vs.
Grammarly
Great for grammar and spelling. Not built for tone, clarity, or the human read of a message.
Serene rewrites for how the message lands — not just whether it’s correct.
vs.
Doing nothing
You reread it three times, still aren’t sure, and either send it anyway or overthink it into a worse draft.
Three rewrites are free. The first one takes five seconds.
Is this for you?
Serene is built
Serene is built
for people who send a lot of messages
You write 10+ messages a day that actually matter
You’ve ever reread a sent email and winced
You care what people think of how you communicate
You handle client work, sales, hiring, or support
You’d never paste a client email into a public AI tool
You want a tool that fits your workflow, not replaces it
Not for you if…
You want AI to write messages from scratch
You need team seats under one account
You’re looking for inline grammar suggestions
You want real-time suggestions as you type
Honest positioning matters. We’d rather you know before you buy.
Built to fit in
Write where the message lives
01
Stays in place
Polish replies, comments, support notes, and outreach where the message already lives. Gmail, LinkedIn, your CRM — any browser text field.
02
Stays yours
Serene offers a rewrite. You decide whether to keep it. Every suggestion shows up before it replaces anything — the final version still sounds like you.
03
Stays private
Your key stays on this device. We only talk to our servers to check your license. Your drafts never reach us.
How it rewrites
Four modes for four kinds of messages
Pick the read you want. Each mode rewrites the same draft a different way — you stay in control of which version goes out.
Humanize
Loosens stiff, formal drafts so they sound like a person.
Sharp
Cuts hedging. Says it directly, without losing you.
Polish
Light touch-up. Same draft, just sharper.
From the field
From people who send a lot of messages
“I used to reread every LinkedIn message three times before sending. Now I run it through Serene and it’s done.”
“Serene caught a tone issue in a client email I was about to send. Saved a genuinely awkward conversation.”
“Works across everything: Gmail, LinkedIn, my CRM. The rewrites actually sound like me, just better.”
Setup
Up and rewriting in under five minutes.
1
Install and try free
Install from the Chrome Web Store. Serene activates on any text field instantly. Three rewrites are included before any purchase.
2
Activate your license
Buy a year from the Serene store. Paste the license key from your purchase email into the popup and click Activate. Your year starts from that moment.
3
Add your API key and choose a model
Serene is bring-your-own-key. Choose OpenAI or Claude, paste your API key, and pick a model. Your key stays on this device.
A note from the maker
“I built Serene because I kept doing the same thing: writing a message, reading it back, feeling like it didn’t quite land, then copying it into ChatGPT and back. That’s four steps for a thirty-word email.”
Serene started as a personal tool. A Chrome extension that lived next to the text field and made the message better before I hit send. No new tab. No pasting. No wondering if I should change it back.
The goal wasn’t to replace how you write. It was to give you the confidence of a second read without the cost of a second opinion.
K
Pricing
One price.
One price.
No seat limits.
No subscription guilt.
A flat $9.99 for a full year. After activation, rewrites run through your own API key — you pay the provider directly, at cost, no markup.
No credit card for trial
Founding price
$120
92% off
$
9.99
A year from first activation
Cheaper than one awkward follow-up.
- Three trial rewrites — no credit card
- A year from first activation
- Works across every browser text field
- Fix & Humanize, Humanize, Sharp modes
- OpenAI and Claude with model choice
- Your key stays on this device — always
Secure checkout. Questions? Email us directly.
Rewrites run through your own key. It stays on this device.
FAQ
A few things worth knowing
Still have a question? Email hi@studiokunj.com — we reply within a day.
What does Serene improve?
Serene looks for grammar issues, unclear phrasing, and tone that lands wrong. Then it offers a rewrite before you send.
Does it require an API key?
Three trial rewrites are included at no cost. After that, Serene uses your own OpenAI or Claude key. You pay the API provider directly — at cost, no markup.
How does purchasing work?
Buy a year of access from the Serene store. After purchase, you receive a license key by email. Paste it into the Serene popup to activate. Your year starts from that moment.
Is the extension replacing text automatically?
No. Every rewrite is shown before anything changes. You decide whether to apply it, keep your original, or try a different mode.
Which AI providers and models does Serene support?
OpenAI (GPT-4o, GPT-4o mini, o1-mini) and Anthropic Claude (claude-3-5-sonnet, claude-3-haiku). Model selection is in Settings after activation.
Can I use Serene on multiple devices?
Each license is tied to one device at activation. Contact us at hi@studiokunj.com to transfer to a new device.
What happens when my one-year access expires?
You can renew at the same price. Your key stays on this device — you just lose access to rewrites until renewed.