head to head · open source
realtime vs fluvio
realtime has 7,675 GitHub stars, 479 forks, 78 open issues and last shipped yesterday. fluvio has 5,260 stars, 531 forks, 139 open issues and last shipped 3 days ago. realtime leads on adoption by 46% (7,675 vs 5,260 stars). realtime is written in Elixir under Apache-2.0; fluvio is written in Rust under Apache-2.0. realtime has attracted 6% as many forks as stars, fluvio 10%. realtime was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (distributed-systems), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| realtime | fluvio | |
|---|---|---|
| GitHub stars | ★ 7.7K | ★ 5.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Elixir | Rust |
| Last push | 2026-11-04 | 2026-11-02 |
| Forks | ⑂ 479 | ⑂ 531 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick realtime if
- You weight community size — 7.7K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Elixir
- You value the larger contributor base for long-term maintenance
pick fluvio if
- You want the fluvio feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and fluvio fits your workflow better
About realtime
Supabase Realtime Send ephemeral messages, track and synchronize shared state, and listen to Postgres changes all over WebSockets. Examples · Request Features · Report Bugs Status This repository focuses on version 2 but you can still access the previous version's code and Docker image. For the latest Docker images go to The codebase is under heavy development and the documentation is constantly evolving. Give it a try and let us know what you think by creating an issue. Watch releases of this repo to get notified of updates. And give us a star if you like it! Overview What is this? This is a server built with…
read the full realtime overview →
About fluvio
Fluvio Composable, Declarative, Stateful Data Streaming System Fluvio is a lean and mean distributed data streaming engine written in Rust. Combined with Stateful DataFlow distributed stream processing framework, Fluvio provides a unified composable distributed streaming and stream processin g paradigm for developers. Quick Start Get started with Fluvio in 2 minutes or less! Step 1. Download Fluvio Version Manager: Fluvio is installed via the Fluvio Version Manager , shortened to fvm . To install fvm , run the following command: TEMPORARY NOTE : While we are transitioning to a new fluvio community hosted fluvio…
read the full fluvio overview →
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Frequently asked questions
Is realtime or fluvio more popular?
realtime has 7,675 GitHub stars and fluvio has 5,260. realtime has the larger community by that measure.
Are realtime and fluvio free?
Both are open source. realtime is licensed under Apache-2.0 and fluvio under Apache-2.0. Neither carries a licence fee.
What is the difference between realtime and fluvio?
realtime is written in Elixir and fluvio in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, realtime or fluvio?
Choose realtime if you want the larger community (7,675 stars) or its Apache-2.0 licence terms. Choose fluvio if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.