Your private copy editor. On your machine. Always free.
Why Betty
Everything a great copy editor should be. None of what you'd rather skip.
Completely private
Your words never leave your computer. No cloud, no servers, no subscription. Betty runs entirely on your machine — what you write is yours, full stop.
Built for writers
Betty understands prose. She catches the usual grammar gremlins, yes — but she also notices when a sentence is doing too much work, or not enough.
One-click setup
Download, open, write. No configuration files, no command line, no API keys. If you can open a document, you can use Betty.
No data centres
Betty runs entirely on your machine. No cloud server humming away somewhere on your behalf, no distant data centre, no someone else’s electricity. What runs, runs on yours.
Free. Actually free.
No trial period. No freemium tier. No credit card required. Betty is free because good writing tools should be available to everyone who writes.
Your voice, kept
Betty suggests — she doesn't overwrite. Every edit is yours to accept, reject, or argue about. The words stay yours from first draft to final full stop.
Getting started
Four steps. Then just write.
Download
Grab the installer for your system above. It's one file — no package manager, no dependencies to chase down.
Install
Open the installer and follow along. The whole thing takes about as long as making a cup of tea. Maybe less.
Open your writing
Paste in your text, or open a file directly. Betty works with plain text, Markdown, and most common document formats.
Let her read
Hit edit and Betty will go through your work. Suggestions appear inline — accept them, ignore them, your choice. She can take it.
For teams
Betty means Business.
Running a team of writers, editors, or translators? Betty can do quite a bit more when she has a proper desk to work at.
That might mean a dedicated machine tucked in your office, or a workstation in the cloud — whichever fits your setup. Either way, your team gets real power and your documents go nowhere they shouldn't.
Drop us a note and we'll figure out what makes sense for you.
A few notes
What Betty is — and isn't.
She's good. But she's not magic. Here's what you should know before you start.
Read the full disclosure
Betty is a writing aid, not a ghostwriter. She suggests edits — you decide what to keep. Your voice, your call, always.
She can be wrong. Language is strange and context is everything. Betty will occasionally suggest something that isn't better than what you had. Read her suggestions; don't just accept them in a batch.
No data is sent anywhere. Betty runs a language model entirely on your device. Nothing you type is transmitted to any server, logged, or stored outside your own machine.
System requirements apply. Betty needs at least 8 GB of RAM and around 3 GB of free disk space. On older or lower-spec machines she may run slowly — she's doing real computational work under the hood.
Betty is free. There is no paid tier, no upsell, no trial period ending. If that ever changes, you'll hear about it here first — in Betty's own words.
Stay in the loop
Letters from Betty.
New version out? Something worth reading? Betty will drop a note — no more than once a month, and only when she actually has something to say.
Unsubscribe any time. No tracking, no sharing, no surprises.
Betty is free
But coffee isn't.
“If Betty saved you an afternoon of re-reading your own prose in mounting despair, maybe buy her a coffee. It genuinely helps keep the lights on.”
Buy Betty a coffeeAbout the team
Hi, I am team!
My name is Simon — I have a Ph.D. in Data Science, and a bunch of experience in software development by now. But let's skip the boring stuff…
I am also the author of the Worldsea Trilogy which you can (and totally should) go buy right now on Amazon. I love writing stories but I hate fixing typos. That's why I created Betty — so that more stories can come to life, even the ones that do not have the financial backing to hire professional editors.
System requirements
What you'll need.
| Platform | Minimum version | Notes |
|---|---|---|
| macOS | 12 Monterey or later | Apple Silicon & Intel both supported |
| Windows | Windows 10 (64-bit) or later | |
| Linux | glibc 2.31 or newer | Debian 11, Ubuntu 20.04, or equivalent |
| Also required: 8 GB RAM minimum · approx. 3 GB free disk space | ||