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IBM Semeru Runtime Open Edition vs Amazon Corretto: catalog facts
IBM Semeru Runtime Open Edition	Amazon Corretto
Best for: Java developers wanting an OpenJ9-based OpenJDK build	Best for: Java developers and servers that need a supported, free JDK
Free Free to download, with optional paid enterprise support from IBM.	Free Free, including long-term support.
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	Free long-term support from Amazon Certified Java SE compatible All 4 strengths for Amazon Corretto Free long-term support from Amazon Certified Java SE compatible Quarterly security and performance updates Several Java versions from 8 to 27
Only useful to people running or developing Java software OpenJ9 tuning options differ from HotSpot	A JDK only; IDEs and build tools are separate Direction is set by Amazon rather than a community foundation
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 Amazon Corretto aws.amazon.com/corretto Catalog checked September 24, 2026

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