Privacy-First
Real-Time Chat
Chat without compromise. Choose persistent group conversations or ephemeral private rooms that vanish without a trace.
Two Ways to Chat
Choose the right level of privacy for every conversation
Persistent Group Chats
Like WhatsApp groups, but better. Messages are stored securely in the database for ongoing conversations.
Stored Messages
Access your conversation history anytime
Username Only
No phone numbers, no personal identifiers
Text-Only Chat
Fast, focused messaging for v1
Ephemeral Private Rooms
For truly private conversations. Messages exist only in RAM and disappear forever when you leave.
Auto-Delete
Room vanishes when the last user leaves
RAM Only
Messages never touch the disk
Zero Retention
No logs, no metadata, no trace
Security First
n-f= 5D;Qk8@ ?M yLA S2Gx7DuZ%-End-to-End Encryption
All messages are encrypted in transit and at rest. Only you and your recipients can read them.
No Phone Numbers
Create an account with just a username. No phone number, no email required.
Zero-Retention Chats
Ephemeral rooms leave no trace. The server retains nothing after you disconnect.
Private by Design
We can't read your messages. We don't track you. We don't sell your data.
Minimal Data Storage
We only store what's necessary for persistent groups. Private rooms? Nothing.
Open Source
Don't trust, verify. Our code is open for audit by security researchers worldwide.
Some love from
our users
`Koshitsu has revolutionized how our team communicates. The privacy features give us peace of mind for sensitive discussions.`
Sarah Johnson
Product Manager
TechCorp
`Finally, a chat platform that takes privacy seriously. End-to-end encryption without compromising on user experience.`
Michael Chen
Security Analyst
CyberSafe
`The ephemeral rooms are perfect for our quick team huddles. No data retention means no worries about information leaks.`
Emily Rodriguez
Startup Founder
InnovateLab
`Koshitsu has revolutionized how our team communicates. The privacy features give us peace of mind for sensitive discussions.`
Sarah Johnson
Product Manager
TechCorp
`Finally, a chat platform that takes privacy seriously. End-to-end encryption without compromising on user experience.`
Michael Chen
Security Analyst
CyberSafe
`The ephemeral rooms are perfect for our quick team huddles. No data retention means no worries about information leaks.`
Emily Rodriguez
Startup Founder
InnovateLab
`We've tried many chat solutions, but Koshitsu's privacy-first approach is exactly what we needed. The group features are incredibly intuitive and the interface is clean.`
David Park
CTO
DataFlow
`Client confidentiality is paramount in our work. Koshitsu's zero data retention policy makes it the only choice for attorney-client communications. Highly recommended!`
Lisa Thompson
Legal Counsel
LawFirm Partners
`HIPAA compliance made easy. Koshitsu allows our medical team to communicate securely without worrying about data breaches or unauthorized access.`
James Wilson
Healthcare Administrator
MediCare Solutions
`We've tried many chat solutions, but Koshitsu's privacy-first approach is exactly what we needed. The group features are incredibly intuitive and the interface is clean.`
David Park
CTO
DataFlow
`Client confidentiality is paramount in our work. Koshitsu's zero data retention policy makes it the only choice for attorney-client communications. Highly recommended!`
Lisa Thompson
Legal Counsel
LawFirm Partners
`HIPAA compliance made easy. Koshitsu allows our medical team to communicate securely without worrying about data breaches or unauthorized access.`
James Wilson
Healthcare Administrator
MediCare Solutions
`This is what the future of messaging should look like. No phone numbers, no tracking, just pure communication.`
Amanda Foster
Privacy Advocate
Digital Rights Org
`Protecting sources is critical. Koshitsu's ephemeral rooms ensure sensitive conversations truly disappear without a trace.`
Robert Martinez
Journalist
NewsDaily
`Managing a distributed team across time zones is challenging. Koshitsu makes secure communication effortless and reliable.`
Karen Singh
Remote Team Lead
GlobalTech Inc
`This is what the future of messaging should look like. No phone numbers, no tracking, just pure communication.`
Amanda Foster
Privacy Advocate
Digital Rights Org
`Protecting sources is critical. Koshitsu's ephemeral rooms ensure sensitive conversations truly disappear without a trace.`
Robert Martinez
Journalist
NewsDaily
`Managing a distributed team across time zones is challenging. Koshitsu makes secure communication effortless and reliable.`
Karen Singh
Remote Team Lead
GlobalTech Inc