Spring Boot vs Quarkus: Which Java Framework for 2025?
Compare startup time, memory, and developer experience. When to choose Spring Boot and when Quarkus fits better.
Spring Boot and Quarkus both run Java in production. Here’s how they differ and when to pick which.
Spring Boot vs Quarkus comparison
Comparison
Startup and memory — Quarkus is built for fast startup and low memory (native and JVM). Spring Boot 3 with AOT and native is improving; Quarkus still leads for containers and serverless.
Ecosystem — Spring has a larger ecosystem (Data, Security, Cloud). Quarkus has good coverage for REST, Kafka, and reactive; some integrations are lighter.
Developer experience — Both have live reload and clear docs. Quarkus feels more “opinionated”; Spring is more “add what you want.”
Kubernetes and cloud — Quarkus targets containers and GraalVM native. Spring Boot works everywhere; Spring Cloud adds discovery and config. Both support Kubernetes.
Learning curve — Spring knowledge is widespread. Quarkus is easier if you want a single runtime model (reactive or imperative) and care about footprint.
Startup time (typical, ms):
Cold start (JVM, simple REST app)
When to choose which
Spring Boot — Large teams, existing Spring investment, need for Spring Cloud or broad integrations. Quarkus — New services, containers, serverless, or when startup and memory matter. Both are production-ready; try Quarkus for a new microservice and compare.
Spring vs Quarkus in practice:
Takeaway
Spring Boot dominates the market; Quarkus excels at fast, lean runtimes. Choose by team skills, deployment target, and how much you value startup time and footprint.
