Comparison

Fission vs OpenFaaS

On the evidence we track, Fission leads this comparison with a composite score of 54/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Fission full profile →OpenFaaS full profile →

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★Fission54

OpenFaaS42

Attribute comparison across 2 tools
Attribute	FissionLeader	OpenFaaS
vioscaleAI score	54 / 100medium · 54%	42 / 100low · 42%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	open_source	freemium
Price levelpricing.price_level	free	low
Transparentpricing.transparent	✓	✗
Integrations
Countintegrations.count	6	12
Security
Scorecardsecurity.scorecard	7.7	4.2
Vulnerabilitiessecurity.vulnerabilities	Count: 18 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Ffission%2Ffission&per_page=100 · Last 12m: 18 · Max severity: CRITICAL	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fopenfaas%2Ffaas&per_page=100 · Last 12m: 0
Adoption
Dependent reposadoption.dependent_repos	3	55
Github starsadoption.github_stars	8,933	26,249
Activity
Commits last 30dactivity.commits_last_30d	60	0
Release
Cadence daysrelease.cadence_days	24	136
Historyrelease.history	20 items	5 items
License
Spdxlicense.spdx	Apache-2.0	-
Language
Primarylanguage.primary	Go	Go
Market
Availabilitymarket.availability	-	Available worldwide · HQ GB
Content
Faqcontent.faq	6 items	6 items

Score

vioscaleAI score

Fission54 / 100medium · 54%

OpenFaaS42 / 100low · 42%

Pricing

Free tier

Fission✓

OpenFaaS✓

Model

Fissionopen_source

OpenFaaSfreemium

Price level

Fissionfree

OpenFaaSlow

Transparent

Fission✓

OpenFaaS✗

Integrations

Count

Fission6

OpenFaaS12

Security

Scorecard

Fission7.7

OpenFaaS4.2

Vulnerabilities

FissionCount: 18 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Ffission%2Ffission&per_page=100 · Last 12m: 18 · Max severity: CRITICAL

OpenFaaSCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=go&package_name=github.com%2Fopenfaas%2Ffaas&per_page=100 · Last 12m: 0

Adoption

Dependent repos

Fission3

OpenFaaS55

Github stars

Fission8,933

OpenFaaS26,249

Activity

Commits last 30d

Fission60

OpenFaaS0

Release

Cadence days

Fission24

OpenFaaS136

History

Fission20 items

OpenFaaS5 items

License

Spdx

FissionApache-2.0

OpenFaaS–

Language

Primary

FissionGo

OpenFaaSGo

Market

Availability

Fission–

OpenFaaSAvailable worldwide · HQ GB

Content

Faq

Fission6 items

OpenFaaS6 items

Capabilities

Feature-by-feature on the axes that matter for serverless & edge platforms. “-” means undocumented, not absent.

Capability comparison for Serverless & Edge Platforms
Capability	Fission	OpenFaaS
Core
Execution substrate	Container	Container
Language / runtime breadth	Python, NodeJS, Go, Rust, C#, PHP (extensible to any language)	extensive language support
Reach
Runs at global edge PoPs	✗	-
Scale
Scale to zero	✓	✓
Performance
Cold-start profile	Provisioned concurrency	-
Limits
Max execution duration	-	extended execution timeouts
Integration
Event source breadth	HTTP and event triggers	HTTP, Cron, Kafka, RabbitMQ, GCP Pub/Sub, PostgreSQL, AWS SNS/SQS
HTTP endpoint trigger	✓	✓
Cron / scheduled invocations	✓	✓
State
Durable state / workflow primitive	-	-
Flexibility
Bring-your-own runtime / container	✓	✓
Deployment
Hosting	Cloud + self-hosted	Cloud + self-hosted
Ops
Built-in logs / metrics / tracing	✓	✓
Extensibility
CLI + IaC / framework support	✓	✓

Core

Execution substrate

FissionContainer

OpenFaaSContainer

Language / runtime breadth

FissionPython, NodeJS, Go, Rust, C#, PHP (extensible to any language)

OpenFaaSextensive language support

Reach

Runs at global edge PoPs

Fission✗

OpenFaaS-

Scale

Scale to zero

Fission✓

OpenFaaS✓

Performance

Cold-start profile

FissionProvisioned concurrency

OpenFaaS-

Limits

Max execution duration

Fission-

OpenFaaSextended execution timeouts

Integration

Event source breadth

FissionHTTP and event triggers

OpenFaaSHTTP, Cron, Kafka, RabbitMQ, GCP Pub/Sub, PostgreSQL, AWS SNS/SQS

HTTP endpoint trigger

Fission✓

OpenFaaS✓

Cron / scheduled invocations

Fission✓

OpenFaaS✓

State

Durable state / workflow primitive

Fission-

OpenFaaS-

Flexibility

Bring-your-own runtime / container

Fission✓

OpenFaaS✓

Deployment

Hosting

FissionCloud + self-hosted

OpenFaaSCloud + self-hosted

Ops

Built-in logs / metrics / tracing

Fission✓

OpenFaaS✓

Extensibility

CLI + IaC / framework support

Fission✓

OpenFaaS✓

What each one is

The product in its own terms, so the numbers below have context.

Fission

Leader

An open-source framework for building and deploying serverless functions on Kubernetes with automatic scaling. Supports multiple programming languages and can be triggered by HTTP requests, message queue events, and scheduled tasks.

Independently observed

OpenFaaS

A framework for deploying functions to Kubernetes with automatic scaling, event-driven triggers, multi-tenancy support, and enterprise features including SSO, RBAC, and direct engineering support.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Fission

Leader

Open sourceFree tier

Free, open source under Apache License

as of 2026-08-14verify ↗

OpenFaaS

HybridFree tier14-day trial

Free community edition; subscription-based standard and enterprise tiers

Community EditionFree
- Legacy UI portal
- REST API
- Basic metrics & observability
- Cron trigger
Standard14-day trial available; custom pricing
- Scale to zero
- Kafka/RabbitMQ/GCP Pub/Sub/PostgreSQL/AWS SNS/SQS triggers
- UI dashboard
- Grafana dashboards
- Kubernetes Custom Resources (CRD)
- +4 more
EnterpriseContact sales
- Enterprise support with SLA
- Direct engineering support via Slack
- Annual architecture review
- Function Builder REST API
- Identity and Access Management
- +3 more

as of 2026-10-15verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	Fission	OpenFaaS
WebPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✗	✓
Self-hostedDeployment	✓	✓
On-premiseDeployment	✗	✓
HybridDeployment	✗	✓
Air-gappedDeployment	✗	✓

Platforms

Web

Fission✗

OpenFaaS✓

CLI

Fission✓

OpenFaaS✓

Deployment

Cloud / SaaS

Fission✗

OpenFaaS✓

Self-hosted

Fission✓

OpenFaaS✓

On-premise

Fission✗

OpenFaaS✓

Hybrid

Fission✗

OpenFaaS✓

Air-gapped

Fission✗

OpenFaaS✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

In common (2)

Istio
Grafana

Fission

Leader

6 total - 4 not shared

Kubernetes
Fluentd
Prometheus
MCP

Independently observed

OpenFaaS

24 total - 22 not shared

Apache Kafka
AWS SQS
AWS SNS
GCP Pub/Sub
RabbitMQ
PostgreSQL
MQTT
Cron
Linkerd
NATS JetStream
GitHub
Slack
Salesforce
Zoom
Google Docs
Gmail
DigitalOcean
Crunchbase
Kafka
AWS SNS/SQS
Discord
Gumroad

Independently observed

Still deciding?

Fission or OpenFaaS: which one depends on you

A composite score cannot know your constraints. Describe them and both get re-weighted against what you actually need, with the evidence behind every position.

Free to run, no account needed to start. How the evaluation works

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.