Letro, on every device you trust
Secure, evidential client communication on your phone, tablet and in the browser. One encrypted workspace, wherever you work.
Signed copy attached for your records.
Received — we will countersign today.
The KYC pack for the Rossi file is complete — passport, proof of address and risk profile.
10:07Good. Is her PostNumber verified?
10:08Yes — passport verified this morning. CH441012.
10:12Then we can open the account today.
10:17Approved. I will countersign at 14:00.
10:25Install once. Sign in everywhere
Conversations, files and your PostNumber identity follow you to every device you verify.
iPhone & iPad
The native Letro app for iPhone and iPad, end-to-end encrypted on your device.
Download on the App StoreAndroid
The native Letro app for Android phones and tablets, with the same end-to-end encryption.
Coming soonWeb app
The full Letro in your browser. Nothing to install.
Open the web appTrouble installing? Contact support — or browse the Help Center.
From download to first message in 3 steps
Download Letro
Install the app on your phone or tablet — or open the web app in any modern browser.
Choose your platform →Get your PostNumber
Verify your identity once with your passport. Everyone you talk to knows exactly who is on the other side.
What is PostNumber? →Join your workspace
Accept your organisation’s invite, or create a workspace and bring your clients and colleagues in.
Invite someone →Encryption works best when both sides have it
Send a colleague or client a short introduction to Letro, with a link to download it on their device.
Opens your email app with the introduction and link ready to send.
Rolling Letro out to your firm? We set up your workspace, verify your team and onboard your first clients with you.