About
Built by someone who was drowning in email
LetterLeaf is a two-person company in Sweden. Here is who we are, why this exists, and what we believe an inbox should do.
Jimmy Kåsby
Founder, LetterLeaf · Sweden
I spent eight years as a product manager before this. LetterLeaf is my second company; the first was a project-planning tool that ended up with Fortune 500 customers and was spun out on its own.
This one started as a personal problem. I was spending two hours a day on email while building a product on the side, and every tool I tried either wanted to replace my email client or only worked with one Gmail account. So, with one other person, I built the thing I wanted: an inbox that reads every email once, tells me which ones actually need me, and drafts the answer in my own voice.
We showed it at Web Summit Lisbon in 2025, rebuilt most of it on what we learned there, and open the beta in October 2026.
what we believe
The inbox is the wrong list
The inbox shows you everything. What you need in the morning is the six emails where a real person is waiting on you. Everything we build follows from that.
Triage before drafting. People trusted the needs-a-reply list long before they trusted an AI draft, so the list is the centre of the product, not the AI.
In your voice, with your facts. A draft that sounds like you but invents a delivery date gets deleted. Drafts are grounded in your own documents and sent mail.
The inbox you actually have. Gmail, Outlook, a shared support@ mailbox and a Fastmail address on your own domain, treated as one inbox. Most tools stop at Gmail.
Say where the email goes. We are a Swedish company and AI processing runs inside the EU. That is on the security page, not in a footnote.
in short
LetterLeaf at a glance
Company
Two people, Sweden
Built nights and weekends for more than a year before the public beta.
Product
An inbox built for triage
Categories, sentiment, Smart Views, Focus Mode, drafts in your voice, workflows.
Works with
Gmail, Outlook, shared mailboxes, IMAP
Connect several accounts and work them as one inbox.
Data
AI processing in the EU
Microsoft Azure’s EU data zone. Nothing is used to train models.
Seen at
Web Summit Lisbon 2025
Where most of the current product was rethought.
Beta
October 2026
Free trial, no card. Join the waitlist to be first.
“I was spending two hours a day on email. Now I open my inbox once and it’s already sorted. That’s why I built LetterLeaf.”
Jimmy Kåsby, founder