Your data lives elsewhere
Contracts and design documents end up in an outside provider’s storage. When you want them gone, you are not deleting them — you are asking someone else to.
A Levelupsoft Inc. software product
Your work conversations
never leave your servers
SSemTalk is a messenger your company runs itself. Messages, files and calls all move inside your own servers, and your people use the messenger screens they already know.
- 4
- Desktop and mobile apps
- 10
- Languages supported
- 100%
- Inside your own infrastructure
Why self-hosted
What is convenience costing you
Public messengers are quick to adopt. In return, your message history, your attachments and a relationship map close to your org chart all pile up on someone else’s infrastructure.
Compliance is hard to prove
In a financial, healthcare or public-sector audit, asked "where is that conversation kept", you have nothing to offer but an outside vendor’s terms of service.
The rules change
Pricing, retention periods and feature limits are not yours to set. The day they change, the whole organization has to fall in line.
Product
SSemTalk ships as server and apps together
We do not hand over server software and leave the apps to you. Apps for four platforms are built to face your server and come with it.
Server
Install it in your data center or on an in-house server. One Docker set brings up the server, the database and the certificates.
Apps
macOS, Windows, Android and iPhone. Ship them under your own name and icon, and install them alongside a public messenger on the same device.
Bots and integration
Use the Bot API you already know. Existing Python and Node bots work once you change the server address.
Features
Everything work needs, from day one
Messages and files
One-to-one and group chats, read receipts, replies, files up to 2GB, photos and documents.
Voice calls
End-to-end encrypted calls between two people, with a relay (TURN) for networks that block the direct path.
Bots and automation
Create bots with @BotFather and connect internal systems through the HTTP Bot API and webhooks.
Admin console
Users, bots and storage, how sign-up codes are delivered, and device sign-out, all on one screen.
Sign-up control
Whether registration is open, how verification codes travel (SMS, email, admin console), blocked numbers and attempt limits.
Ten languages
The apps and the documentation come in ten languages including Korean, with right-to-left layout for Arabic.
Architecture
The layout at a glance
Apps connect to the server over standard MTProto, and the server records to PostgreSQL by event sourcing. Call audio never passes through the server; it travels between the apps directly.
Diagram explained
- Left to right: apps → edge → server → storage. Every arrow ends inside the company boundary.
- Solid lines are the path messages and files take. The server receives them, records them and pushes them to connected devices.
- The dashed line is voice. Call audio does not pass through the server, and goes by way of the relay only on networks that block the direct path.
- Internal systems attach as bots. Sending alerts, approvals and deployment results into a chat room is the common use.
- Storage accumulates events. What changed, when and how stays on the record instead of being overwritten.
Deployment
From install to everyday use, in four steps
- 1
Bring up the server
One Docker Compose set. The server, PostgreSQL and the certificates come up together.
- 2
Domain and certificates
Point your company domain at it and HTTPS certificates are issued and renewed automatically.
- 3
Roll out the apps
Download and install the apps carrying your own brand. Store distribution is possible too.
- 4
Sign-up and operations
Set how people join in the admin console, and see users, bots and storage in the same place.
Technology
Built on proven parts
MTProto 2.0
The same transport protocol the public messenger uses. There is no need to build new apps.
Java 21 · Netty
Requests are handled on virtual threads. A single server carries thousands of connections.
PostgreSQL · event sourcing
Events accumulate instead of state being overwritten. Audit and recovery come from the same record.
More than 4,000 tests
Real clients connecting and exchanging messages are checked automatically as well.
Thinking about deploying SSemTalk?
Tell us your scale and your compliance requirements and we will propose a setup that fits. We can help with a trial installation too.
Contact ushalo@levelupsoft.com+82 10-8472-4070
Levelupsoft Inc.