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IBM Semeru Runtime Open Edition vs GraalVM: catalog facts
IBM Semeru Runtime Open Edition	GraalVM
Best for: Java developers wanting an OpenJ9-based OpenJDK build	Best for: Java developers building fast-starting services and small container images
Free Free to download, with optional paid enterprise support from IBM.	Free Free to download; the source code is published in the oracle/graal repository.
macOS, Command line	Windows, macOS, Linux, Command line
Uses the Eclipse OpenJ9 JVM instead of HotSpot Drop-in replacement for other OpenJDK builds All 3 strengths for IBM Semeru Runtime Open Edition Uses the Eclipse OpenJ9 JVM instead of HotSpot Drop-in replacement for other OpenJDK builds Free binaries with optional commercial support	Native Image builds fast-starting, low-memory executables First-class support in Spring Boot, Micronaut, Helidon and Quarkus All 4 strengths for GraalVM Native Image builds fast-starting, low-memory executables First-class support in Spring Boot, Micronaut, Helidon and Quarkus Works as a drop-in JDK with existing Java tools Truffle framework for running other languages
Only useful to people running or developing Java software OpenJ9 tuning options differ from HotSpot	Native Image compilation is slower than a normal Java build Native executables include only reachable code, so reflection-heavy code needs configuration
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0 with Classpath Exception
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for IBM Semeru Runtime Open Edition developer.ibm.com/languages/semeru-runtimes Catalog checked October 1, 2026	Official website Full listing and sources Sources for GraalVM graalvm.org Catalog checked October 1, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.