Head-to-Head Comparison · Alternative to Slack · 👥 community
Slack vs Fluxer
Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities. Here is how Fluxer ($0/mo open source) stacks up against Slack ($15/mo) across cost, hosting, data privacy, and real-world trade-offs.
Fluxer is a verified Open Source-licensed open-source replacement for Slack. Switching from Slack ($15/mo) saves $180/yr per solo seat, or $900/yr for a 5-person team. Deployment: Runs on Self-host.
The catch: Requires self-hosting setup, updates, and server maintenance compared to managed Slack.
Slack vs Fluxer Specifications
facts verified 2026-11-07
| Dimension | Slack (Paid) | Fluxer (Replacement) |
|---|---|---|
| Monthly Price | $15 / mo | $0 / mo |
| 1-Year Cost (1 seat) | $180 / yr | $0 / yr (Save $180) |
| 1-Year Cost (5 seats) | $900 / yr | $0 / yr (Save $900) |
| 1-Year Cost (10 seats) | $1,800 / yr | $0 / yr (Save $1,800) |
| Source & License | Proprietary SaaS | open source Open Source |
| Where It Runs | Vendor Cloud | Self-host (your server) |
| Platforms | Web / Cloud | webself-hosteddocker to self-host |
| GitHub Stars | — | ★ 10.8k (active nov 2026) |
Deep Dive: Switching from Slack to Fluxer
Trade-offs, installation & data architecture
What you trade away
Requires self-hosting setup, updates, and server maintenance compared to managed Slack.
How to deploy Fluxer
Clone https://github.com/fluxerapp/fluxer or deploy with Docker Compose
What it takes to run
Deploy via Docker or binary release from GitHub and configure environment variables.
Where your data lives
All application data and configuration live on your own server or local database.
Why fork Fluxer instead of vibe-coding a Slack clone?
Instead of paying recurring SaaS fees for Slack or rebuilding it from scratch, deploy one of the 19 battle-tested open-source alternatives like Macro Chat.
Slack vs Fluxer FAQ
Is Fluxer a good free alternative to Slack?+
Yes. Fluxer is a verified open-source (Open Source) replacement for Slack. Free, open-source instant messaging and VoIP platform with full Markdown support, voice/video calls, moderation tools, and self-hosting options for communities.
What is the catch when switching from Slack to Fluxer?+
Requires self-hosting setup, updates, and server maintenance compared to managed Slack.
How much do you save switching from Slack to Fluxer?+
Slack costs $15/mo ($180/yr) per seat, whereas Fluxer is $0/mo. Switching saves $180/yr for a solo user, $900/yr for a 5-person team, and $1,800/yr for a 10-person team.
How do I install or self-host Fluxer instead of Slack?+
Install: Clone https://github.com/fluxerapp/fluxer or deploy with Docker Compose. Setup: Deploy via Docker or binary release from GitHub and configure environment variables.
