head to head · open source
realtime vs fluvio
realtime has 7,635 GitHub stars, 468 forks, 78 open issues and last shipped 2 days ago. fluvio has 5,257 stars, 530 forks, 139 open issues and last shipped 21 days ago. realtime leads on adoption by 45% (7,635 vs 5,257 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 | ★ 7.6K | ★ 5.3K |
| License | Apache-2.0 | Apache-2.0 |
| Written in | Elixir | Rust |
| Last push | 2026-09-18 | 2026-08-30 |
| Forks | ⑂ 468 | ⑂ 530 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick realtime if
- You weight community size — 7.6K 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 is a server built with Elixir on the Phoenix Framework that pushes three kinds of realtime functionality to browser and server clients over WebSockets. It lives in the Supabase ecosystem, where it acts as the realtime layer alongside Postgres, and it is distributed as open source under the Apache 2.0 license. The project has been public for roughly seven years, carries 7,632 stars and 463 forks, and its topic list places it in the company of change data capture, CRDT, distributed systems, pubsub, and PostgreSQL tooling.
read the full realtime overview →
About fluvio
Fluvio is a distributed data streaming engine written in Rust, distributed under the Apache 2.0 license and developed in the fluvio community repository. It is described as composable, declarative and stateful: a streaming runtime that pairs with Stateful DataFlow, a distributed stream processing framework, so that a single system covers both the transport of event streams and the transformation of that data while it is in motion. The project sits in the Rust and cloud native ecosystem and is published on crates.io, with documentation hosted at fluvio.io.
read the full fluvio overview →
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Frequently asked questions
Is realtime or fluvio more popular?
realtime has 7,635 GitHub stars and fluvio has 5,257. 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 (7,635 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.