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OpenJDK vs IBM Semeru Runtime Open Edition: catalog facts
OpenJDK	IBM Semeru Runtime Open Edition
Best for: Developers who need a standard JDK to build and run Java applications	Best for: Java developers wanting an OpenJ9-based OpenJDK build
Free Free under the GPL; Oracle also sells a commercially licensed JDK built from the same code.	Free Free to download, with optional paid enterprise support from IBM.
Windows, macOS, Linux, Command line	macOS, Command line
Reference implementation of the Java Platform Free production-ready builds for three desktop platforms All 3 strengths for OpenJDK Reference implementation of the Java Platform Free production-ready builds for three desktop platforms Open development with public source and proposals	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
Oracle's OpenJDK builds are only updated for a short time per release Older versions such as JDK 17 need builds from other vendors for updates	Only useful to people running or developing Java software OpenJ9 tuning options differ from HotSpot
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0 with Classpath Exception	License not stated
No account needed	No account needed
Offline features available	Offline features available
Official website Full listing and sources Sources for OpenJDK openjdk.org Catalog checked October 1, 2026	Official website Full listing and sources Sources for IBM Semeru Runtime Open Edition developer.ibm.com/languages/semeru-runtimes Catalog checked October 1, 2026

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