What you write to each other stays between you.
Your chat's server is in your home. No server of ours in between: we don't have any.
内緒 (naisho), Japanese for “let's keep it between us”.
What it does
Text and voice messages
Document and media sharing
Private conversations, one-to-one or in groups
Topic groups, by subject or department
Calls and video meetings
Like a video conference: for the family or the office.
So why is Naisho different?
- 1
On your phone
The message is encrypted before it leaves.
- 2
Through the Outpost
It holds it, but can't open it.
- 3
To the recipient
Only their phone decrypts it.
What about messaging apps?
The app belongs to a provider: if a request comes in, they decide what happens on your phone. Not you.
Europe
Messaging apps go through a company's servers. That company answers to the laws and requests it receives.
United States
Under the CLOUD Act (2018) a US company may have to hand over the data it stores, even if it sits in Europe.
United Kingdom
In 2025, after a UK government order reported by the press, a major provider stopped offering advanced protection for data stored online to new users in the UK.
With Naisho the server is yours: no external provider holds your messages.
Ready in three steps.
- 1
The app
Download Naisho on your phone or computer.
- 2
The Outpost
Install the Outpost on a computer you already have, running Windows 10/11 or Linux.
- 3
The invites
Send the invites. Everyone connects from their computer or the app.
You set it up yourself. If you get stuck, write to us.
- Linux
- Windows
- Web
- Android
- iOS
Interface prototype, with sample data.
For people who write things that matter.
Three things that won't happen to you with Naisho.
- 1
A company decides.In 2021 a major provider shut down the account of a father who had sent his doctor a photo of his sick son. Though cleared, he was left without his email, photos and phone number.
- 2
Your number can be found.In 2025 researchers at the University of Vienna showed that 3.5 billion numbers could be found on one of the most widely used apps, along with the profile photo when it was public. The flaw has been fixed.
- 3
A door for the police also opens for thieves.In 2024 Salt Typhoon broke into the lawful interception systems of US phone companies. CISA and the FBI confirmed it.
- No company can lock you out: the group lives on your own computer.
- No central directory to query: only the group knows the group.
- No door. Not for us, not for whoever runs the group.
How it works
No open door for messages: your own computer, which nobody can find on the network.
Learn moreYour Naisho doesn't depend on anyone's cloud.
Not even the giants'.
In 2024 and 2025 a single major provider's outage stopped services worldwide for hours. Your Outpost doesn't depend on an external cloud.
What if GiBSeS disappeared tomorrow?
Your Naisho keeps working. It doesn't depend on us.
Chat Control 1.0 has passed.
Even though 314 MEPs voted to reject it and only 276 to keep it. What about 2.0? Will it pass?