FastAPI vs Flask
type: WebPage
description: FastAPI is a modern Python web framework built on Starlette that prioritizes speed and automatic API documentation with async support by default, while Flask is a lightweight, minimalist framework that emphasizes simplicity and flexibility with synchronous request handling. FastAPI's built-in features result in ~3x faster request handling and automatic OpenAPI/Swagger documentation, whereas Flask requires manual setup for these capabilities.
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date published: 2026-07-09T11:45:15.871Z
date created: 2026-07-09T11:45:15.871Z
date modified: 2026-07-09T11:45:15.918Z
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caption: FastAPI vs Flask — Side-by-side comparison on A Versus B

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FastAPI vs Flask
type: Article
type: TechArticle
abstract: FastAPI is a modern Python web framework built on Starlette that prioritizes speed and automatic API documentation with async support by default, while Flask is a lightweight, minimalist framework that emphasizes simplicity and flexibility with synchronous request handling. FastAPI's built-in features result in ~3x faster request handling and automatic OpenAPI/Swagger documentation, whereas Flask requires manual setup for these capabilities.
description: FastAPI is a modern Python web framework built on Starlette that prioritizes speed and automatic API documentation with async support by default, while Flask is a lightweight, minimalist framework that emphasizes simplicity and flexibility with synchronous request handling. FastAPI's built-in features result in ~3x faster request handling and automatic OpenAPI/Swagger documentation, whereas Flask requires manual setup for these capabilities.
language: en-US
main entity of page: FastAPI vs Flask
content reference time: 2026-07-09T11:45:15.918Z
author: A Versus B
publisher: A Versus B
date published: 2026-07-09T11:45:15.871Z
date created: 2026-07-09T11:45:15.871Z
date modified: 2026-07-09T11:45:15.918Z
text: Choose FastAPI if you're building modern REST APIs that require high performance, automatic documentation, async operations, or type safety with built-in validation—ideal for microservices, real-time applications, and teams prioritizing developer experience. Choose Flask if you prioritize simplicity, have an existing codebase, need a lightweight framework for small projects, or prefer minimal dependencies and maximum flexibility in architecture decisions.
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about: FastAPI
about: Flask
mentions: Request Performance (requests/sec)
mentions: Async/Await Support
mentions: Automatic API Documentation
mentions: Learning Curve (hours to productivity)
mentions: Ecosystem Maturity (years since release)
mentions: Built-in Data Validation
mentions: GitHub Stars (as of 2026)
related link: https://www.aversusb.net/compare/flask-vs-fastapi
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related link: https://www.aversusb.net/compare/flask-vs-fastapi))
related link: https://www.aversusb.net/compare/flask-vs-starlette))
related link: https://www.aversusb.net/compare/express-vs-fastapi))
related link: https://www.aversusb.net/compare/django-vs-fastapi
citation: FastAPI — Wikipedia
citation: Flask — Wikipedia
significant link: https://www.aversusb.net/entity/fastapi
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significant link: https://www.aversusb.net/entity/flask
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A Versus B
type: Organization

FastAPI
type: SoftwareApplication
description: Modern, fast Python web framework for building APIs with automatic documentation and async-first design.
alternate name: Fastapi
language: en-US
subject of: FastAPI vs Flask

Flask
type: SoftwareApplication
description: Lightweight Python WSGI web framework for building traditional web applications and APIs.
language: en-US
subject of: FastAPI vs Flask

FastAPI vs Flask — Comparison Data
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description: Structured comparison data for FastAPI vs Flask with 161 attributes.
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license: https://creativecommons.org/licenses/by/4.0/
creator: A Versus B
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FastAPI vs Flask — Attribute Category Vocabulary
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description: Taxonomy of attribute categories used to classify comparison data for FastAPI vs Flask.
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has defined term: Enterprise
has defined term: Resources
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has defined term: Job Market
has defined term: History
has defined term: Deployment
has defined term: Security
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has defined term: Simplicity
has defined term: Accessibility
has defined term: Market Demand
has defined term: Learning
has defined term: Career Prospects
has defined term: Core Features
has defined term: Support Quality
has defined term: Ease of Use
has defined term: DevOps
has defined term: Development Efficiency
has defined term: Functionality
has defined term: Code Complexity
has defined term: Career Value
has defined term: Maintenance

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in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

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term code: dependencies
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

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term code: maturity
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Performance
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term code: performance
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Development
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term code: development
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Features
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term code: features
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Ecosystem
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term code: ecosystem
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Industry Use
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in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Developer Experience
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term code: developer-experience
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Requirements
type: DefinedTerm
term code: requirements
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Resource Efficiency
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term code: resource-efficiency
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Installation
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term code: installation
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Adoption
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term code: adoption
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Compatibility
type: DefinedTerm
term code: compatibility
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Community
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term code: community
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Development Speed
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term code: development-speed
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Adoption & Community
type: DefinedTerm
term code: adoption-&-community
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Language Design
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term code: language-design
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Footprint
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term code: footprint
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Ecosystem & Community
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term code: ecosystem-&-community
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Learning Curve
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term code: learning-curve
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Community Popularity
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in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Enterprise
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term code: enterprise
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Resources
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term code: resources
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Career
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term code: career
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Stability
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term code: stability
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Popularity
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term code: popularity
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Job Market
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term code: job-market
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

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term code: history
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Deployment
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term code: deployment
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Security
type: DefinedTerm
term code: security
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Scalability
type: DefinedTerm
term code: scalability
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Simplicity
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term code: simplicity
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Accessibility
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term code: accessibility
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Market Demand
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term code: market-demand
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Learning
type: DefinedTerm
term code: learning
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Career Prospects
type: DefinedTerm
term code: career-prospects
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Core Features
type: DefinedTerm
term code: core-features
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Support Quality
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term code: support-quality
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Ease of Use
type: DefinedTerm
term code: ease-of-use
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

DevOps
type: DefinedTerm
term code: devops
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Development Efficiency
type: DefinedTerm
term code: development-efficiency
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Functionality
type: DefinedTerm
term code: functionality
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Code Complexity
type: DefinedTerm
term code: code-complexity
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Career Value
type: DefinedTerm
term code: career-value
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

Maintenance
type: DefinedTerm
term code: maintenance
in defined term set: FastAPI vs Flask — Attribute Category Vocabulary

faq
type: FAQPage
language: en-US
is accessible for free: true
conditions of access: Free
date modified: 2026-07-09T11:45:15.918Z
author: A Versus B
publisher: A Versus B
is part of: FastAPI vs Flask
main entity: Which framework is faster, FastAPI or Flask?
  type: Question
  accepted answer: Answer
    text: FastAPI is approximately 3x faster than Flask. Benchmark testing shows FastAPI handles ~12,000 requests/second while Flask handles ~4,000 requests/second on comparable hardware. This performance advantage comes from FastAPI's async-first design built on Starlette, whereas Flask handles requests synchronously by default. For most small projects, this difference is negligible, but for high-traffic APIs or real-time systems, FastAPI's throughput advantage is significant.
    language: en-US
main entity: Can I use async with Flask?
  type: Question
  accepted answer: Answer
    text: Flask 2.0+ (released 2021) added native async/await support for view functions, but it remains limited. Flask's async implementation doesn't provide the same concurrency benefits as FastAPI because Flask's ecosystem (middleware, extensions) is designed synchronously. To use async effectively in Flask, you typically need to use external libraries like gevent or implement async manually. FastAPI's async support is first-class and deeply integrated throughout the framework, making it the better choice for async-heavy applications.
    language: en-US
main entity: Do I need to manually document my API with FastAPI?
  type: Question
  accepted answer: Answer
    text: No. FastAPI automatically generates interactive OpenAPI (Swagger UI) and ReDoc documentation from your code's type hints and docstrings. Simply define your endpoints with Pydantic models and type annotations, and documentation is instantly available at `/docs` (Swagger) and `/redoc` (ReDoc). Flask requires manual documentation setup using tools like Flasgger, Connexion, or manually writing OpenAPI/Swagger YAML files. This saves significant development time with FastAPI.
    language: en-US
main entity: Is Flask still relevant in 2026?
  type: Question
  accepted answer: Answer
    text: Yes, Flask remains highly relevant and production-ready, especially for small-to-medium projects, prototypes, and teams that value simplicity. Flask's mature ecosystem (18+ years), extensive community resources, and proven track record make it ideal for educational projects and systems where flexibility matters more than raw performance. However, for new API-heavy projects, teams increasingly prefer FastAPI's built-in features and modern async support. Many organizations continue maintaining Flask applications successfully.
    language: en-US
main entity: Which framework should a beginner choose?
  type: Question
  accepted answer: Answer
    text: Flask is better for beginners due to its minimal learning curve (5-10 hours to first API) and straightforward syntax. FastAPI's type hints, async concepts, and automatic validation—while powerful—require more foundational Python knowledge. Beginners typically learn Flask faster and can build functional applications immediately. Once comfortable with Python and async concepts, graduating to FastAPI is straightforward. Starting with Flask is a reasonable path for long-term learning.
    language: en-US

Minimum Python/Node Version
type: PropertyValue
value reference: Requirements

GitHub Stars
type: PropertyValue
value reference: Community Popularity

Production Maturity
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value reference: Enterprise

P99 Latency (typical)
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value reference: Performance

Peak Throughput (Req/s)
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value reference: Performance

Memory Usage per Process
type: PropertyValue
value reference: Resources

Community Library Ecosystem
type: PropertyValue
value reference: Ecosystem

Job Market Postings (2026)
type: PropertyValue
value reference: Career

Framework Maturity
type: PropertyValue
value reference: Stability

Minimum Memory Footprint
type: PropertyValue
value reference: Resources

GitHub Stars (as of 2026)
type: PropertyValue
value reference: Community Popularity

NPM Weekly Downloads
type: PropertyValue
value reference: Popularity

Time to Production Hello World
type: PropertyValue
value reference: Development

Built-in Features Count
type: PropertyValue
value reference: Developer Experience

Production Applications (market estimate)
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value reference: Adoption

Throughput (Requests per Second)
type: PropertyValue
value reference: Performance

Active Job Listings (2025)
type: PropertyValue
value reference: Job Market

Learning Curve
type: PropertyValue
value reference: Usability

Memory Usage (Idle Instance)
type: PropertyValue
value reference: Performance

Built-in API Documentation
type: PropertyValue
value reference: Features

Native Type Validation
type: PropertyValue
value reference: Features

Initial Release Year
type: PropertyValue
value reference: History

Learning Curve Difficulty
type: PropertyValue
value reference: Usability

Type Hint Support
type: PropertyValue
value reference: Developer Experience

Requests Per Second (Single Instance)
type: PropertyValue
value reference: Performance

Memory Footprint Per Process
type: PropertyValue
value reference: Performance

Time to Basic API (Hello World)
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value reference: Development

Built-in Authentication
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Database ORM Included
type: PropertyValue
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Ecosystem Size (Packages)
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value reference: Ecosystem

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Async Support
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Auto Documentation Generation
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Time to 'Hello World' App
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Memory Usage (Idle)
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Lines of Code for Basic Endpoint
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GitHub Stars (2026)
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Production Readiness Without External Server
type: PropertyValue
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Requests Per Second (Throughput)
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Automatic API Documentation
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Built-in Database ORM
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Admin Interface
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Weekly Downloads (PyPI)
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Minimal Project Setup Time
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value reference: Development Speed

Stack Overflow Questions (all-time)
type: PropertyValue
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Authentication Built-in
type: PropertyValue
value reference: Security

Cold Start Time (Serverless)
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WebSocket Support
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Data Science Library Integration
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GitHub Stars (Community)
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Available Extensions
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Minimum Project Boilerplate
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Framework Core Size
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Average Startup Time
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Market Share Among Web Frameworks
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Job Market Demand (LinkedIn postings 2026)
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type: PropertyValue
value reference: Developer Experience

Available Extensions/Packages
type: PropertyValue
value reference: Ecosystem

Latest Stable Release
type: PropertyValue
value reference: Maintenance