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IBM Semeru Runtime Open Edition vs Eclipse Temurin: catalog facts
IBM Semeru Runtime Open Edition	Eclipse Temurin
Best for: Java developers wanting an OpenJ9-based OpenJDK build	Best for: Developers and servers that need a free, certified Java runtime
Free Free to download, with optional paid enterprise support from IBM.	Free Free to download and use with no licensing fees.
macOS, Command line	Windows, macOS, Linux
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	Java SE TCK certified OpenJDK builds Built from open-source scripts and infrastructure All 3 strengths for Eclipse Temurin Java SE TCK certified OpenJDK builds Built from open-source scripts and infrastructure No licensing fees for production use
Only useful to people running or developing Java software OpenJ9 tuning options differ from HotSpot	Provides the runtime and JDK only, not an IDE or build tools
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-2.0 WITH Classpath-exception-2.0
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 Eclipse Temurin adoptium.net Catalog checked September 23, 2026

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