OpenFaaS vs Fission

OpenFaaS8.4Visit Fission8.2Visit

Higher score OpenFaaS #6 in Serverless Development Frameworks 8.4/10 Free plan · 14-day trial Free planFree trial✓ 0 of 4 features Visit OpenFaaS

vs

Fission #7 in Serverless Development Frameworks 8.2/10 Open source ✓ 0 of 4 features Visit Fission

• OpenFaaS fits best

  Teams deploying containerized functions on Kubernetes

• Fission fits best

  Kubernetes teams needing scalable event-triggered functions

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Side by side

Feature	OpenFaaS 8.4/10 Visit ↗	Fission 8.2/10 Visit ↗
At a glance
Editor score	8.4	8.2
Ranking	#6 in Serverless Development Frameworks	#7 in Serverless Development Frameworks
Best for	Teams deploying containerized functions on Kubernetes	Kubernetes teams needing scalable event-triggered functions
Pricing model	Free plan + paid	Free
Starting price	$1,250/mo	Open source
Free plan	✓ (best)	Not checked yet
Free trial	14 days	—
Deployment	Cloud, Desktop, Self-hosted	Desktop, Self-hosted
Platforms	Web, Linux	Linux, macOS, Windows
Integrations	11 integrations	7 integrations
Features OpenFaaS 0/4 · Fission 0/4
Local testing	Not checked yet	Not checked yet
Application packaging	Not checked yet	Not checked yet
Kubernetes support	Not checked yet	Not checked yet
Deployment rollback	Not checked yet	Not checked yet
Specs
Deployment targets	Not checked yet	Not checked yet
Supported languages	Not checked yet	Not checked yet
Deployment model	Not checked yet	Not checked yet
Our review
Pros	Deploy to Kubernetes, K3s, OpenShift, or a single host with faasd Supports event connectors including Kafka, RabbitMQ, and PostgreSQL Offers language templates plus custom container images and runtimes	Supports HTTP, timer, queue, and Kubernetes event triggers. Automatically provisions and scales function pods. Offers streaming responses and Prometheus and Fluentd integration.
Cons	Community Edition limits deployments to 15 functions and one namespace Private function registries and scale-to-zero require a paid plan Standard starts at $1,250 per month	Requires teams to operate the Kubernetes infrastructure themselves. Deployment is CLI-based rather than through a hosted service. Functions use a request-based execution model.
Our verdict	OpenFaaS is a self-hosted serverless platform for teams deploying event-driven functions and microservices as OCI container images. It targets Kubernetes, K3s, OpenShift, and single-host deployments with faasd, and is designed for cloud,… Read the review →	Fission brings serverless-style functions to Kubernetes clusters that teams operate themselves. Developers can write short-lived functions, package them in language-specific runtime environments, and expose them through HTTP or event… Read the review →

Strengths and trade-offs

• OpenFaaS — where it wins

  • Deploy to Kubernetes, K3s, OpenShift, or a single host with faasd
  • Supports event connectors including Kafka, RabbitMQ, and PostgreSQL
  • Offers language templates plus custom container images and runtimes

  Where it doesn't

  • Community Edition limits deployments to 15 functions and one namespace
  • Private function registries and scale-to-zero require a paid plan
  • Standard starts at $1,250 per month

• Fission — where it wins

  • Supports HTTP, timer, queue, and Kubernetes event triggers.
  • Automatically provisions and scales function pods.
  • Offers streaming responses and Prometheus and Fluentd integration.

  Where it doesn't

  • Requires teams to operate the Kubernetes infrastructure themselves.
  • Deployment is CLI-based rather than through a hosted service.
  • Functions use a request-based execution model.

• OpenFaaS8.4/10 · Free plan · 14-day trial

  A self-hosted, container-based serverless platform with broad Kubernetes targets and paid scale-to-zero.

  Visit OpenFaaSFull verdict →
• Fission8.2/10 · Open source

  A self-hosted way to run event-triggered functions on Kubernetes, with automatic scaling.

  Visit FissionFull verdict →