A writing room, not a control panel
A Markdown-first composer, reusable templates, and deliberate preview states keep the work close to the page.
Built for focused, independent publishing
Newsletter software for people who write.
Compose, send, publish, and understand your newsletter in one calm workspace. Your subscribers stay portable, your archive stays yours, and pricing follows sends—not audience size.
No credit card for Free. Upgrade only when your delivery volume needs it.FIELD NOTE 011
The cell that learned to remember.
Good science writing makes the strange precise.
BOUNDARY CONDITIONSThe cell that learned to remember.Today · 7 min read
When an organ grows its own clockLast week · 9 min read
The second genome in every roomTwo weeks ago · 6 min read
When an organ grows its own clockLast week · 9 min read
The second genome in every roomTwo weeks ago · 6 min read
10,000free sends each month
Unlimitedsubscribers on every plan
$49 flatfor 250,000 included sends
1 exportto take your publication with you
The tool
Everything a newsletter needs. Nothing a platform wants.
The product follows the publishing loop: write, preview, send, publish, and learn. Every feature earns its place in that sequence.
Delivery you can reason about
Domain authentication, suppression checks, test sends, schedules, and exact usage all live in one clear path.
An audience you can take with you
Collect, import, tag, and export subscribers while your public archive and first-party analytics compound over time.
Built to stay focused
The product gets better by knowing what it is not.
Write OS is a newsletter operating system, not an attention marketplace. That boundary keeps the interface calm and the relationship between publisher and reader direct.
× No social feed× No ad network× No algorithmic recommendations× No AI ghostwriter× No podcast hosting× No community sprawl
Straightforward pricing
Subscribers are free. Sends are the only meter.
Grow your list without moving through pricing tiers. Pay when delivery volume grows, with the allowance and overage printed in advance.
Free
$0
Up to 10,000 sends each month- Unlimited subscribers
- Compose, send, archive, and analytics
- Subscriber imports and exports
Paid
$49 / month
Includes 250,000 sends each month- Everything in Free
- $0.5 per additional 1,000 sends
- One predictable bill, independent of list size
What you would actually pay
Move the audience size and publishing cadence. The estimate updates instantly.Start with the next issue
Build a publication worth returning to.
Free for your first 10,000 sends each month. No audience-size tax.