
Element.io
Telegram
Tox
WhatsApp
Signal
Threema
Zulip
ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.

Slack
Rocket.Chat
Discord
Element.io
Telegram
Zulip
Microsoft Teams
Mattermost is an open source alternative to Slack.

Which is more popular?
Based on our record, Mattermost seems to be a lot more popular than ChatSecure. While we know about 75 links to Mattermost, we've tracked only 2 mentions of ChatSecure.
Website, pricing, platforms and company facts side by side.
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| Website | chatsecure.org | mattermost.com |
| Pricing | ||
| Company | — | Startup from the United States |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
This app is recommended for privacy-conscious users, journalists, activists, or anyone needing a secure way to communicate sensitive information. It's especially beneficial for individuals who prefer open-source applications and have a technical understanding of secure messaging.
Overall verdict
Why this product is good
Recommended for
Mattermost is recommended for organizations that prioritize data privacy and security, need extensive customization options, or are looking to integrate a collaboration tool into existing systems. It is also suitable for teams in regulated industries requiring on-premises solutions.
Walkthroughs and reviews on video.
Tutorial Chatsecure
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using ChatSecure and Mattermost. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


ChatSecure is a free and open-source encrypted messaging app for iOS. It takes various measures to make sure there are no loopholes in your security and privacy needs. The secure messaging app features OTR...
Mattermost is an open-source platform that enables safe collaboration in self-hosted chat programs featuring file sharing, search, and integrations; groups and businesses can use it as an internal chat.
Mattermost uses monolithic architecture, which is tightly coupled and complex to understand. It restricts the scalability of the collaboration tool, which is a limitation for growing businesses. In that case,...
Below is a curated list of the 12 best self-hosted messaging apps like MirrorFly, Mattermost, Zulio, Nextcloud, and Rocket.chat that offer unique collaboration features and lets you take full control of your data.
Recommendations tracked on public social media and blogs since March 2021.


Https://chatsecure.org/ > ChatSecure is a free and open source messaging app that features OMEMO encryption and OTR encryption over XMPP. You can connect to your existing Google accounts or create new accounts on public XMPP servers... - Source: Hacker News / over 3 years ago
In this case, I would rather suggest others to use the likes of Element a Matrix client, or e.g. RetroShare, Briar, OnionShare, or e.g. XMPP with the clients like Dino, Conversations, Gajim, ChatSecure. Source: over 5 years ago
The amazing thing is that there is almost always an open-source alternative that is 10x better in many ways, in the case of slack https://mattermost.com/ I'm looking forward for AI to make it very easy to deploy your own tools and walk... - Source: Hacker News / 21 days ago
How does it compare to MatterMost [1]? [1] https://mattermost.com/. - Source: Hacker News / 4 months ago
Slack's value is real, especially for cross-company conversations with clients and vendors. But for internal communication in companies that care about data residency or audit requirements, Mattermost is a credible self-hosted... - Source: dev.to / 5 months ago
When comparing ChatSecure and Mattermost, you can also consider the following products.

Secure messaging app with strong end-to-end encryption, advanced group chat privacy settings, secure video calls for teams, encrypted communication using Matrix open network. Riot.im is now Element.
Compare Element.io to ChatSecure or Mattermost:

A messaging app for teams who see through the Earth!
Compare Slack to ChatSecure or Mattermost:

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Compare Telegram to ChatSecure or Mattermost:

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.
Compare Rocket.Chat to ChatSecure or Mattermost:

Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.
Compare Tox to ChatSecure or Mattermost:

Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.
Compare Discord to ChatSecure or Mattermost: