Comparison

FastAPI vs Ruby on Rails

On the evidence we track, FastAPI leads this comparison with a composite score of 73/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

FastAPI full profile →Ruby on Rails full profile →

Machine formatsJSON Markdown GraphQLor send Accept: application/json

★FastAPI73

Ruby on Rails67

Attribute comparison across 2 tools
Attribute	FastAPILeader	Ruby on Rails
Vioscale score	73 / 100high · 78%updating	67 / 100medium · 52%updating
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	commercial	open_source
Price levelpricing.price_level	free	free
Integrations
Countintegrations.count	11	-
Security
Disclosure policysecurity.disclosure_policy	-	✓
Scorecardsecurity.scorecard	-	6.8
Vulnerabilitiessecurity.vulnerabilities	Count: 2 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=fastapi&per_page=100 · Last 12m: 0 · Max severity: HIGH	Count: 18 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=activesupport&per_page=100 · Last 12m: 3 · Max severity: CRITICAL
Reliability
Status pagereliability.status_page	✓	-
Adoption
Dependent reposadoption.dependent_repos	43,608	1,358,186
Github starsadoption.github_stars	101,862	58,719
Package downloads weeklyadoption.package_downloads_weekly	127,838,650	-
Stackoverflow questionsadoption.stackoverflow_questions	31,000	-
Activity
Commits last 30dactivity.commits_last_30d	210	100
Release
Cadence daysrelease.cadence_days	14	-
Historyrelease.history	20 items	20 items
License
Spdxlicense.spdx	MIT	MIT
Language
Primarylanguage.primary	Python	Ruby
Market
Availabilitymarket.availability	Available worldwide · HQ ES	-
Content
Faqcontent.faq	8 items	-

Score

Vioscale score

FastAPI73 / 100high · 78%updating

Ruby on Rails67 / 100medium · 52%updating

Pricing

Free tier

FastAPI✓

Ruby on Rails✓

Model

FastAPIcommercial

Ruby on Railsopen_source

Price level

FastAPIfree

Ruby on Railsfree

Integrations

Count

FastAPI11

Ruby on Rails–

Security

Disclosure policy

FastAPI–

Ruby on Rails✓

Scorecard

FastAPI–

Ruby on Rails6.8

Vulnerabilities

FastAPICount: 2 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=pypi&package_name=fastapi&per_page=100 · Last 12m: 0 · Max severity: HIGH

Ruby on RailsCount: 18 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=rubygems&package_name=activesupport&per_page=100 · Last 12m: 3 · Max severity: CRITICAL

Reliability

Status page

FastAPI✓

Ruby on Rails–

Adoption

Dependent repos

FastAPI43,608

Ruby on Rails1,358,186

Github stars

FastAPI101,862

Ruby on Rails58,719

Package downloads weekly

FastAPI127,838,650

Ruby on Rails–

Stackoverflow questions

FastAPI31,000

Ruby on Rails–

Activity

Commits last 30d

FastAPI210

Ruby on Rails100

Release

Cadence days

FastAPI14

Ruby on Rails–

History

FastAPI20 items

Ruby on Rails20 items

License

Spdx

FastAPIMIT

Ruby on RailsMIT

Language

Primary

FastAPIPython

Ruby on RailsRuby

Market

Availability

FastAPIAvailable worldwide · HQ ES

Ruby on Rails–

Content

Faq

FastAPI8 items

Ruby on Rails–

Capabilities

Feature-by-feature on the axes that matter for web frameworks. “-” means undocumented, not absent.

Capability comparison for Web Frameworks
Capability	FastAPI	Ruby on Rails
Core
Rendering model	-	Server-side
File-based routing	-	-
Language	Python	Ruby
Rendering
Server components	-	-
Streaming SSR	-	-
Fullstack
Built-in API / backend routes	✓	✓
DX
First-class TypeScript	-	✗
Fast refresh / HMR	✓	-
Deployment
Edge runtime support	-	-

Core

Rendering model

FastAPI-

Ruby on RailsServer-side

File-based routing

FastAPI-

Ruby on Rails-

Language

FastAPIPython

Ruby on RailsRuby

Rendering

Server components

FastAPI-

Ruby on Rails-

Streaming SSR

FastAPI-

Ruby on Rails-

Fullstack

Built-in API / backend routes

FastAPI✓

Ruby on Rails✓

First-class TypeScript

FastAPI-

Ruby on Rails✗

Fast refresh / HMR

FastAPI✓

Ruby on Rails-

Deployment

Edge runtime support

FastAPI-

Ruby on Rails-

What each one is

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

FastAPI

Leader

FastAPI is a modern web framework for constructing APIs in Python that combines high performance with developer convenience through automatic validation, interactive documentation generation, and first-class type hint support.

Independently observed

Ruby on Rails

A Ruby-based framework bundling everything needed for web development: database management, templating engines, email delivery, real-time updates, async job handling, file storage, and built-in protections against common attacks like SQL injection and cross-site scripting.

Independently observed

Pricing

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

FastAPI

Leader

Open sourceFree tier

as of 2026-08-14verify ↗

Ruby on Rails

Open source

as of 2026-08-16verify ↗

Platform & deployment

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

Platform and deployment support comparison
Supports	FastAPI	Ruby on Rails
WebPlatforms	✓	✓
macOSPlatforms	✗	✓
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✗
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✓

Platforms

Web

FastAPI✓

Ruby on Rails✓

macOS

FastAPI✗

Ruby on Rails✓

Windows

FastAPI✗

Ruby on Rails✓

Linux

FastAPI✗

Ruby on Rails✓

CLI

FastAPI✓

Ruby on Rails✗

Deployment

Cloud / SaaS

FastAPI✓

Ruby on Rails✓

Self-hosted

FastAPI✓

Ruby on Rails✓

Integrations

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

FastAPI

Leader

11 total

Starlette
Pydantic
OpenAPI
JSON Schema
Swagger UI
ReDoc
OAuth2
JWT
HTTP Basic authentication
Cookies
Session management

Independently observed

Ruby on Rails

Not documented yet.

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