Side by side

Satisfiability.jl vs Stainless

Both stand on formal verification tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Stainless provides contract-based verification and counterexamples for modern Scala projects, with several installation and solver choices. Its language and verification assumptions should be understood before relying on guarantees in production.

Visit Stainless

The facts

	Satisfiability.jl	Stainless
Free plan	Yes	Yes
Open source	Not published	Not published
Runs on	Not published	Linux, Mac, Windows
Lowest paid plan	Not published	Not published
Plans published	None	None
Maker	Not published	Not published
Website	elsoroka.github.io	stainless.epfl.ch
On formal verification tools	#32 of 34	#28 of 34

Satisfiability.jl: what it does well

Stainless: what it does well

Free and open source
Checks contracts, bounds, and pattern matches
Can prove termination and provide counterexamples
Supports multiple SMT solvers
Runs on Linux, macOS, and Windows

What to know first

Scala 2 frontend is unsupported
Requires JDK 17 for standalone release
No default shared-heap concurrency encoding
Verified code may still overflow at runtime

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