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Head-to-head · Serverless Development Frameworks

Spring Cloud Function vs Fn Project

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Spring Cloud Function #4 in Serverless Development Frameworks 8.7/10 Free plan Free plan✓ 2 of 4 features Visit site
Fn Project #8 in Serverless Development Frameworks 8.1/10 Open source ✓ 0 of 4 features Visit Fn Project

Spring Cloud Function leads on 0 checks, Fn Project on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreSpring Cloud Function · 8.7/10
  • Free planonly Spring Cloud Function
  • Most featuresSpring Cloud Function · 2 of 4

Spring Cloud Function scores higher on our rubric for serverless development frameworks: 8.7 against 8.1 out of 10; our editors rank them #4 and #8.

Spring Cloud Function is the better fit for java teams targeting several cloud function providers. Fn Project is the better fit for teams running containerized functions across environments.

  • Spring Cloud Function fits best

    Java teams targeting several cloud function providers

  • Fn Project fits best

    Teams running containerized functions across environments

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Side by side

Feature Spring Cloud Function 8.7/10 Visit ↗ Fn Project 8.1/10 Visit ↗
At a glance
Editor score 8.7 8.1
Ranking #4 in Serverless Development Frameworks #8 in Serverless Development Frameworks
Best for Java teams targeting several cloud function providers Teams running containerized functions across environments
Pricing model Free Free
Starting price Free plan Open source
Free plan ✓ (best) Not checked yet
Free trial — —
Deployment Cloud, Self-hosted Desktop, Self-hosted
Platforms Web Linux, macOS, Windows
Integrations 5 integrations 3 integrations
Features Spring Cloud Function 2/4 · Fn Project 0/4
Local testing ✓ (best) Not checked yet
Application packaging ✓ (best) Not checked yet
Kubernetes support — Not checked yet
Deployment rollback — Not checked yet
Specs
Deployment targets Multi_cloud Not checked yet
Supported languages Java Not checked yet
Deployment model Cloud_functions Not checked yet
Our review
Pros
  • Adapters target AWS Lambda, Azure Functions, and Google Cloud Functions
  • Supports imperative, reactive, and hybrid programming styles
  • Includes function composition, packaging, and local testing workflows
  • Deploy to public, private, hybrid, or on-premises infrastructure
  • Group multiple functions and triggers into applications
  • Use custom Docker images and deploy to Kubernetes with an official Helm chart
Cons
  • Centers on a programming model, not end-to-end infrastructure deployment
  • No documented Kubernetes deployment capability
  • No documented deployment rollback capability
  • Fn Project is self-hosted rather than a vendor-hosted service
  • Its local development guidance is less detailed than some alternatives
  • Operational workflow details are less extensive than some alternatives
Our verdict

Spring Cloud Function is an open-source framework for implementing business logic as functions with the Spring programming model. It suits Java teams that want to keep function code separate from a specific runtime target and run it as a…

Read the review →

Fn Project is an open-source, event-driven Functions-as-a-Service platform for teams that want to run functions on infrastructure they manage. It packages functions as native Docker containers and supports public, private, hybrid, and…

Read the review →
  1. Spring Cloud FunctionServerless Development Frameworks 8.7Free plan
  2. Fn ProjectServerless Development Frameworks 8.1Open source

Strengths and trade-offs

  • Spring Cloud Function — where it wins

    • Adapters target AWS Lambda, Azure Functions, and Google Cloud Functions
    • Supports imperative, reactive, and hybrid programming styles
    • Includes function composition, packaging, and local testing workflows

    Where it doesn't

    • Centers on a programming model, not end-to-end infrastructure deployment
    • No documented Kubernetes deployment capability
    • No documented deployment rollback capability

  • Fn Project — where it wins

    • Deploy to public, private, hybrid, or on-premises infrastructure
    • Group multiple functions and triggers into applications
    • Use custom Docker images and deploy to Kubernetes with an official Helm chart

    Where it doesn't

    • Fn Project is self-hosted rather than a vendor-hosted service
    • Its local development guidance is less detailed than some alternatives
    • Operational workflow details are less extensive than some alternatives
  • Spring Cloud Function8.7/10 · Free plan

    An open-source Spring programming model for packaging and adapting Java functions across clouds.

    Visit siteFull verdict →
  • Fn Project8.1/10 · Open source

    A self-hosted, container-native Functions-as-a-Service platform for deployment across environments.

    Visit Fn ProjectFull verdict →

More comparisons

All serverless development frameworks comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update