on-premises | self-hosted | private cloud

Messagenius: Secure On-premise Slack Replacement

Looking for a secure on-premise replacement of Slack? You are in the right place. Messagenius offers full security measures and self-hosting, superior usage features, and enhanced administrative capabilities – all working together to ensure optimal team work and communications.


On-premise Slack replacement for secure chats and comms across your entire team

Being a self-hosted solution, Messagenius allows companies to keep their data under their exclusive control.


Slack may not be the ideal choice for enterprise team chats in terms of security.

This is because Slack stores and controls your data on its own servers, which could lead to unauthorized access by Slack employees or cyber attackers. To ensure the utmost security for your enterprise messaging, an on-premises solution is recommended. With an on-premises solution, you have full ownership and control over your data, minimizing the risk of external parties gaining access to your confidential information.


Messaging apps are expected to provide core features for team chats. Slack meets these expectations; however, Messagenius takes it a step further by offering a broader range of features to enhance team productivity and automate processes.

In addition to the basic features of Slack, Messagenius provides temporary chats, special alerts, smart filters, and complex administrative dashboard. Moreover, Messagenius offers tailored workflows for each client that are designed to automate mission-critical communication in any use case.


Slack is Slack, and none of your team members work for Slack. Therefore, why should they limit themselves to the Slack environment? With Messagenius being a white-label solution by default, you have the freedom to fully customize your collaboration tool to fit your team’s specific needs. This includes incorporating your branding, selecting the features you require, and having complete control over access at all levels.

Secure On-premise Slack Replacement

Messagenius is the winner of multiple cybersecurity awards for enterprise messaging. We offer the best in security, functionality, and customisation because your business works better when everyone works together.

Here is what Messagenius offers organisations that are ready to upgrade to the best Slack alternative.

Tailored Corporate
White-Label App

Keep your app's user experience and interface in sync with your brand identity. Get a custom private messenger that reflects the values and vision of your organization.

Customisable Encryption Settings

Messagenius offers highly granular security settings. This means you can customise the encryption, user access, and file sharing according to your business needs for every member. Learn more

encrypted messaging for business

Private On-Premises or Cloud Installation

No matter what type of installation you choose, Messagenius guarantees that your enterprise data is safe. We focus on clear data ownership, security, and enterprise privacy.

Choose from three private hosting options:

on-premise installation icon


on your enterprise private server for total data ownership and physical security.

on-premise installation icon

Enterprise private cloud

where you retain data ownership and enjoy the efficiency of cloud operations.

on-premise installation icon

Messagenius cloud server

created and dedicated for your sole enterprise use.

Own Your Data with
Private Encryption Keys

Messagenius operates a unique encryption key system. We hand over the encryption keys to you, and from then on, no one has access to your data except you.

As an extra layer of protection, we allow enterprises to have multiple holders of encryption keys. Splitting control minimizes the risk for data leak.

Secure Your Chats with Advanced Conversation Protection Features

Some people, meetings, and content need an extra level of protection. When your organization needs to move to a higher level of privacy, we have two kinds of chats to protect your people.

Black Box Chats


Know when, what, and to whom all the conversations have been sent within your enterprise. Messagenius Black Box Chats are always certified between sender and recipient. All messages are time stamped and come with a mandatory proof-of-receipt.


Black Hole Chats


Protect your most sensitive data with Black Hole chats. Messagenius Black Hole conversations do not pass through any servers and leave no trace of their existence. Set up a timer, and once your message is open, the message always self-destructs and cannot be recalled from the server.


Achieve GDPR Compliance with Full Data Ownership and Clear Data Sovereignty

Messagenius is 100% compliant with GDPR and leak proof. We do not involve third parties to store, access or use your data. Even the team at Messagenius itself does not have access to your data. The requirements include:

Privacy by design

From the beginning, Messagenius has been designed to protect your data at the individual and enterprise level.

Transfer of data

Messagenius gives you complete control over where and how your data is stored.

Messagenius gives organizations a platform for secure business storage of data and compliance with every GDPR statute.

Get Up and Running Smoothly with Seamless Integration with Existing Software

Messagenius integrates into any intranet, task manager, CRM, corporate communications platform, or other internal system via SDK. Our intranet fit allows managers to track secure communications and work in tandem with existing internal systems.

Learn more

Clients & Partners

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Logo - Engineering Group
Logo - UK department for International Trade

Clients & Partners

Sogei Logo
Logo - Engineering Group
Logo - UK department for International Trade

What they say

“I have selected Messagenius as a messaging tool for our top national client in the infrastructure industry. The excellent feedback from the end-users and the top managers of the client confirmed that Messagenius was the right choice for security, flexibility, and reliability.”

Alessandro Chierico

Responsible for Infrastructure Development & Maintenance Area


Are You Ready to Upgrade to a Better Solution?

Our team can provide you a full demo of the Messagenius platform. You can see for yourself how the user interface will help your groups work together better. We can show you the security features, a roadmap for installation, and the administrative functions of the system.


What are the alternatives to Slack?

While there are alternatives to Slack, Messagenius is the best option for larger businesses and enterprises. Messagenius offers video calling, team conversations, collaboration features, and advanced options suitable for a communication tool for large organizations. Here are more reasons to choose Messagenius:

  • Unlimited users
  • A completely searchable message history
  • Chat rooms for focused team productivity
  • Internal communication tools for managers

Your managers can have full control to create groups, set security settings per user, allow or block public channels, and manage multiple teams easily.

Can Slack be self-hosted?

No, Slack cannot be self-hosted. This is another reason enterprises must consider Slack alternatives. The free version of Slack is not scalable enough for large businesses and the paid versions are simply not secure enough. Messagenius is a fully self-hosted alternative to Slack that gives your organization all the tools you need in a collaboration app while allowing you to run it from your own server.

Is there something better than Slack for my team members?

Boost your team collaboration by using the best of the Slack alternatives: Messagenius. Instead of a busy, crowded team chat, your chat tool could be focused on the important messages every day. Use a team communication tool to send messages to everyone at once. For extra sensitive conversations, use the Black Box or Black Hole features to keep your messages totally secure.

Can Slack be deployed on-premise?

No, Slack cannot be deployed on premise. This is one of the big reasons why your enterprise may need an alternative to Slack. Deploying your team chat tool onto your own servers adds an extra level of protection. When you deploy a team chat app on your own premises, you can also have much more control over any data ownership issues for GDPR and national data law compliance.