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Top 9 Scala Compiler Projects
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> 1) The language is too unstable
Thankfully not anymore. They got their act together and have been maintaining compatibility since Scala 3.0.0 has been released in May 2021, which is almost 4 years and counting.
https://github.com/scala/scala3/releases/tag/3.0.0
Scala 3.x is to remain compatible for the whole 3.x series (think of semantic versioning). There's no Scala 4 (breaking with Scala 3) in sight.
Also, Scala 3 and Scala 2.13 JARs are also compatible with each other, which helped with the transition.
> 2) The tooling around it is not the best
sbt may not be good. But Mill is much better than either Maven or Gradle. Especially Gradle. Bleep is also promising.
Scalafmt is widely used and liked. Scalafix -- the linter/fixer -- is used a bit less, but still of a good quality.
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> Clojurescript for frontend, Rust for portability
If Clojure and Rust work well for you, more power to you. But at least in theory, you could very well use just Scala for these purposes
Scala can compile to JS https://www.scala-js.org/ if you target frontend.
And if you want portability, you can compile a Scala program with GraalVM's native-image and statically link everything with musl libc https://www.graalvm.org/latest/reference-manual/native-image...
And if you want both frontend and portability everywhere, Scala will soon have a support for compiling to WASM (with WASI, etc) https://github.com/scala-wasm/scala-wasm/ (to be integrated into Scala.js after developed)
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> Nothing as close to the metal as Rust has that baked in today
You should have a look at what's going on in Scala-land, with scala-native¹ (and perhaps the Gears² library for direct style/capabilities)
I like this style, though it's been too new and niche to get a taste of it being used at scale.
¹: https://scala-native.org/
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potigol
Linguagem Potigol - Linguagem de programação funcional moderna para iniciantes - A Functional Programming Language for Beginners
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InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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sigmastate-interpreter
ErgoScript compiler and ErgoTree Interpreter implementation for Ergo blockchain
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dotty-patched
Eval library and patched Scala-3/Dotty compiler. Evaluating source code and trees at compile time hacking multi-staging programming
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
Scala Compiler discussion
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A note from our sponsor - InfluxDB
www.influxdata.com | 1 Sep 2025
Index
What are some of the best open-source Compiler projects in Scala? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | dotty | 6,095 |
| 2 | Scala.js | 4,660 |
| 3 | Scala Native | 4,605 |
| 4 | Vale | 1,912 |
| 5 | zinc | 341 |
| 6 | potigol | 256 |
| 7 | scalus | 89 |
| 8 | sigmastate-interpreter | 65 |
| 9 | dotty-patched | 20 |
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