Use case
WhatsApp Alternative
The app your team should have on their phone for client communication — encrypted, governed and auditable, instead of a personal chat app with a professional-secrecy problem.
What it is
A professional messaging app for client communication that clients find as easy as WhatsApp — but end-to-end encrypted on the Matrix protocol, hosted in Switzerland, scoped by client and matter, and governed by the firm rather than by an employee's phone.
Why client messaging belongs in Letro
Scoped, not one global inbox
Conversations are organised by client, matter or team. Nothing bleeds between them.
Encrypted and governed
End-to-end encryption on the Matrix protocol, with the firm — not the individual — in control of retention and access.
Calls included
HD voice and video calls run inside the Workspace or one-to-one.
Sovereign hosting
Swiss-hosted by default; Dedicated and Sovereign deployments put the server under your control, including air-gapped.
How Letro replaces WhatsApp
Same convenience for the client. A different answer for the firm.
01
Invite clients from the app
Clients install Letro and verify once with PostNumber.
02
Message where the record is
The quick question stays in the same channel as the documents it concerns.
03
Control the data
Retention, export and access are set by the firm, not by an employee's phone.
04
Answer the regulator
When asked, produce the timestamped record of who said what, when.
Discuss Your Deployment Model
Whether you need a standard rollout, private infrastructure, or stricter residency and isolation requirements, Letro gives you a trustless foundation for secure client communication.
