Self-hosted Slack. Without the per-user tax.

Mattermost Server

Channels, threads, DMs, file sharing, search. The full Mattermost experience, configured for production. Open source.

Calls (voice + video)

Mattermost Calls plugin pre-installed. Voice channels, video calls, screen sharing, recording. End-to-end encrypted.

Integrations and webhooks

Incoming webhooks, slash commands, OAuth 2.0, LDAP/SAML, and 200+ third-party integrations via the Mattermost Marketplace.

Warp-grade storage

5,000 IOPS Hyperdisk. Real-time message delivery at scale. Daily database backups, point-in-time recovery.

Daisy AI included

Ask Daisy to summarize long threads, draft announcements, or answer questions from your knowledge base. Free with every plan.

Free n8n

When a new message hits a channel, post to Slack, create a ticket, or run any workflow. Free with annual.

Teams replacing Slack

Same UX as Slack (threads, mentions, reactions, search), but self-hosted. Compliance-friendly, GDPR-compliant, you own the data. Saves $8-15/user/mo at scale.

DevOps and SRE teams

Native integrations with PagerDuty, Pager, GitLab, GitHub, Jenkins, CircleCI. Channel-as-incident-response is the industry standard.

Communities and DAOs

Open registration, public channels, threaded discussions. Run a community of practice, a support forum, or an open-source project.

Slack is $8.75-$15/user/mo. Mattermost on Leapjuice is a flat $55/mo for unlimited users on Premium. Same core UX. At 50 users, you save $4,500+/year. At 200 users, you save $30k+/year.

Teams is bundled with Microsoft 365 ($12.50/user/mo). Mattermost on Leapjuice is a flat fee with no per-user cost. Same features: voice, video, file sharing, integrations.

Rocket.Chat is a similar open-source project but with less active development and a smaller community. Mattermost has the larger ecosystem, better documentation, and more frequent releases.