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

Turn Slack threads into a first-class interface for Intercom conversations. Reply in Slack, stay synced in Intercom.

Which is more popular?
Based on our record, Mattermost seems to be more popular. It has been mentioned 75 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | mattermost.com | backreply.com |
| Pricing | ||
| Company | Startup from the United States | Startup from Ireland |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Mattermost yet.
Your support team lives in Slack, but customer conversations live in Intercom. Backreply bridges the two: customers message through Intercom, your team responds from Slack, and replies sync back instantly. Key features: — Reply from Slack: Respond to conversations in Slack threads with full...
What each product offers, as listed by its team.


Possible disadvantages
No features have been listed yet.
An editorial look at what each product does well and who it suits.


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.
Overall verdict
Why this product is good
Recommended for
Walkthroughs and reviews on video.
Mattermost - An Open Source, Self Hosted, Slack Chat Alternative
More videos
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Mattermost and BackReply.
BackReply's answer:
Someone would choose BackReply if their team works primarily in Slack but still uses Intercom for customer messaging. It lets teams reply, assign, route, and collaborate inside Slack while syncing everything back to Intercom automatically, which reduces workflow friction and keeps customer communication consistent and tracked.
BackReply's answer:
BackReply is designed to turn Slack into a reliable reply interface for Intercom, so teams can answer customers directly from Slack threads while Intercom stays the system of record. It focuses on removing context switching, preventing duplicate or lost replies, and enforcing routing and ownership so each conversation has a clear response path.
BackReply's answer:
The main audience is customer support and customer-facing teams using both Slack and Intercom, especially SaaS teams or cross-functional teams where engineers, founders, or product staff sometimes help with support conversations directly inside shared Slack channels.
BackReply's answer:
BackReply was built by a team with years of SaaS integration experience who had previously built products like Rasayel, Interhubz, and Octopods. The team states they created BackReply because they personally experienced the pain of managing support across Slack and Intercom and validated the solution through interviews and real support usage.
Share your experience with using Mattermost and BackReply. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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.
We have no reviews of BackReply yet. Be the first one to post
Recommendations tracked on public social media and blogs since March 2021.


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 / about 1 month ago
How does it compare to MatterMost [1]? [1] https://mattermost.com/. - Source: Hacker News / 5 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 / 6 months ago
Tracking BackReply since Feb 2026.
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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.
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Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
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Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
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