Privacy first, not just promised
Your right hand for big ideas.
Fossi takes on the whole task — drafting a first version, thinking through the options, then sending, scheduling, and following up — and hands the time back to you, checking in before anything that actually matters.
Example task: Help me figure out my first steps for starting a dog-walking business in my neighborhood Fossi put together a first draft — nothing sends until you say go. First draft: Check local licensing and insurance requirements; Set introductory pricing for your first 10 clients; Drafting a flyer for mailboxes and the vet's office board.
Why it's safe
Trusted the way critical infrastructure is trusted.
Fossi isn't built on the assumption that you'll just trust us. It's built on the same kind of trust model that lets the rest of the internet run on software nobody has to blindly believe in.
- Inspired by the same trust model behind the Linux kernel — the software quietly running most of the internet
- Built on open standards, not a black box only Fossi can see inside
- The same category of protection used on some of the most demanding, highest-stakes projects online
How it works
Three steps, and only one of them is yours.
You describe the task
Plain language, the way you'd tell an employee. No workflow builder, no settings to learn first.
Fossi takes it on
It drafts, sends, schedules, or tracks — whatever the job actually needs, start to finish.
You approve what matters
Routine work just happens. Anything that spends money or can't be undone waits for your yes.
Always trusted, always yours. Built on decentralized identity instead of a central database Fossi controls — so your data and every approval stay verifiably yours, not just promised to be.
Why it's safe to hand off
It knows the difference between routine and risky.
Most of what Fossi does, it just does. The moment something costs money, sends to someone outside your business, or can't be undone, it stops and asks first. Every agent your business runs can be halted in one tap, always — not just in theory.
Underneath, every action carries its own verifiable identity — built on the same decentralized-identity layer running under Tessero. Not a promise in the interface: an actual record of what happened, and that it was really authorized.
What it does
A few wins people see in week one.
- Draft a first pass at that new offer you've been meaning to write up
- Put together a few directions for the launch email, ready for you to pick
- Draft and send the weekly invoice reminders
- Answer the customer questions you get every single day
- Book and confirm appointments without the back-and-forth
- Follow up with the vendor who's gone quiet
About
How we got here.
Fossi started with a handful of Harvard founders who kept hitting the same wall: every "AI assistant" for a small business either locked you into one company's walled garden, or asked you to trust a black box with your data. We built it the other way — on open standards, with decentralized identity instead of a database only we control.
Started by Harvard founders
Built out of Tessero, the trust and verification layer underneath it.
Built on open standards
No proprietary lock-in — your data and identity aren't trapped here.
Trust and privacy, from day one
Not a feature added later — it's in the DNA of how this was built.
Early access
Get Fossi before anyone else.
Built by the team behind Tessero.