One secure line to your clients.Verified identities.Private AI agents.
For law firms, wealth managers and trustees. Every exchange recorded, kept for ten years, and ready when the regulator asks.
One encrypted channel. What was sent, to whom, and when, on record
One passport-verified person. Permanent · non-transferable
Drafted by Letro Private AI · approved by a person
Sent isn't proof.
The client texted the payment change, the mandate went by email, and when someone asks what was agreed, the proof is a person's memory.
in fines for off-channel messaging
US regulators have fined more than 100 firms over WhatsApp and personal email since 2021. The messages were fine. The record didn't exist.
lost to email impersonation in a year
Email verifies a domain, not a person. One changed character in a domain is enough, and the message now writes itself.
later, prove it
A regulator asks what was sent, to whom, and when. Screenshots are easy to dispute. A mailbox export shows only what one side kept.
Sources: SEC, remarks on off-channel recordkeeping, Nov 2024 · FBI IC3, 2025 Internet Crime Report, business email compromise losses
Everything between you and a client, in one place.
Instructions, documents, approvals and formal letters move through one encrypted channel instead of email attachments, WhatsApp threads and registered post. Each exchange is timestamped and kept on record as it happens.
You always know who is on the other end.
Every Letro account belongs to one real person, verified against a passport. The identity is permanent and can't be handed to anyone else, so an instruction from a client is from that client, not from whoever controls an inbox. We call it a PostNumber.
Someone not on Letro yet? Reach them by email: they get a free temporary room, and an invitation to get their own PostNumber.
How PostNumber works →
AI that works for your firm, and only inside it.
Letro Private AI reads the mandate, drafts the reply and prepares the approval, inside an isolated environment that Letro operates in Europe for your organisation alone. Nothing goes to a public model provider. Nothing trains anyone's model.
Open protocol. Independently tested. Swiss hosting.
Built on Matrix, the open communication standard chosen by several European governments; its encryption library (vodozemac) audited by Least Authority; mobile apps penetration-tested by ImmuniWeb in October 2026; hosted in Switzerland. ISO 27001 planned for 2027.
See Letro on your own cases in 30 minutes.
Bring a real client scenario. We'll show you the line, the verified identity on each end, and the record it leaves.
From CHF 12 per seat. Founding firms: first 3 months free →