Humaniser
Make a draft sound like you.
Paste an AI draft or a stiff first pass. Sealis rewrites it the way you write, learned from your own samples, and leaves every number, date and name exactly as it was.
10 free rewrites a month. No card.
Try it hereSealis wrote
Hi Dana, I wanted to follow up regardingJust chasing the March invoice, which is now overdueit's a couple of weeks late now. Please let me know when payment will be processed.When can I expect it?
- Kept · edit 01
I wanted to follow up regardingJust chasing - Kept · edit 02
which is now overdueit's a couple of weeks late now - Kept · edit 03
Please let me know when payment will be processed.When can I expect it?
next time, it starts here
10 free rewrites a month. No card. Your text is kept while you sign up.
01How it works
Three steps. You stay in charge.
Show it how you write
Paste a few things you wrote: an email, a post, a message. Sealis measures your sentence length, word choice and punctuation and saves that as your voice.
Paste the draft
Anything stiff, generic or machine-sounding. Sealis changes only what needs changing.
Check it, fix it
Every edit is marked, with a voice-match score. Correct anything, and the next rewrite starts closer.
02Fact lock
Your facts don't move.
A rewrite should change how something sounds, never what it says. Sealis checks the facts. It does not judge whether the meaning is the same.
- NumbersAmounts, quantities, percentages
- DatesDays, months, deadlines
- NamesPeople, companies, places
- LinksWeb addresses and emails
Hi Dana, just chasing invoice #1042 for $4,200. It was due on 14 March, and the pay link is still acme.com/pay. Happy to resend.
- 5 facts found in your draft
- 0 missing
- 0 added
03What it is, and isn't
A voice tool, with the numbers published.
Sealis comes from Sealis Labs. We test how well a rewrite keeps what you said and sounds like you, and we publish the results, including the misses.
04Use it for
Anything you send as yourself.
Emails and applications
A cover letter or a follow-up written with AI, brought back to how you actually write, with every date and figure left alone.
Posts and updates
A founder update or a post drafted by a tool, rewritten so it reads like the person whose name is on it.
Anything you send as yourself
If a draft sounds like a template, this is the step between that draft and your sent folder.
Writing for clients? Studio keeps a voice per client.
05Questions
Asked first.
01Do I need an account?
To rewrite, yes. The free plan includes 10 rewrites a month and 1 saved voice, with no card. What you paste above is kept while you sign up. Score, which measures a draft without rewriting it, works without an account.
02Will it get past AI detectors?
We don't claim that, and we haven't tested for it. Sealis rewrites toward your own voice and measures how close it got. Score isn't a detector either: it doesn't say who or what wrote a draft.
03Will it change my facts?
It shouldn't, and it checks. Numbers, dates, names and links are verified in code, and each rewrite is read back for anything added or dropped. It does not check meaning, and every page that shows the check says so.
04What happens to my text?
Rewrites are produced by an AI model run by Microsoft (Azure), with Google's Gemini as a backup. Your text is sent to that provider and kept under its own terms, which the Privacy section spells out. Avoid pasting anything highly sensitive. You can export or delete your data at any time.