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FastAPI vs Spring Boot

FastAPI logo

FastAPI

Web Development

A modern, fast, high-performance web framework for building APIs with Python

From
Free
Rated
-
Full reviewWebsite
Spring Boot logo

Spring Boot

Web Development

Stand-alone, production-grade Spring based applications that you can just run

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: FastAPI no built-in ORM, requires separate database libraries; Spring Boot requires Java 17 as the minimum version for Spring Boot 4.1.0, per docs.spring.io/spring-boot/system-requirements.html (Aug 2026); older Java runtimes are not supported
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which FastAPI and Spring Boot actually diverge.

Attributes where FastAPI and Spring Boot differ
AttributeFastAPISpring Boot

Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), platforms (Web), user rating (Not yet rated), category (Web Development).

What people use each for

The jobs each tool is most often brought in to do.

FastAPI

  • Building production-ready REST APIs with automatic validationnot Spring Boot
  • Serving machine learning model predictions as REST servicesnot Spring Boot
  • Building crisis management and orchestration platformsnot Spring Boot
  • Enabling real-time APIs with WebSocket connectionsnot Spring Boot
  • Rapid API development reducing boilerplate code significantlynot Spring Boot

Spring Boot

  • Building microservices and standalone Java applicationsnot FastAPI
  • Rapid application development with embedded servers and production-ready configurationsnot FastAPI

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

FastAPI

  • No built-in ORM, requires separate database libraries
  • Python-only, cannot build with other languages
  • Async/await learning curve for developers new to async programming
  • Production deployment requires separate ASGI server configuration

Spring Boot

  • Requires Java 17 as the minimum version for Spring Boot 4.1.0, per docs.spring.io/spring-boot/system-requirements.html (Aug 2026); older Java runtimes are not supported
  • Requires Spring Framework 7.0.8 or above and Gradle 8.14+ or Maven 3.6.3+, per Spring's own system requirements page, so older toolchains must be upgraded first

Pricing, plan by plan

FastAPI

Free

No published plan breakdown. See the FastAPI review.

Spring Boot

Free

No published plan breakdown. See the Spring Boot review.

Which should you pick?

Choose FastAPI if

  • You want to start without paying.
FastAPI review

Choose Spring Boot if

  • You want to start without paying.
Spring Boot review

Questions people ask

Is FastAPI or Spring Boot better?
Neither clearly leads. FastAPI starts at Free and Spring Boot at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, FastAPI or Spring Boot?
FastAPI starts at Free and Spring Boot at Free.
Does FastAPI or Spring Boot run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use FastAPI for free?
Both have a free tier, so you can try either at no cost before committing.
What is FastAPI best used for?
FastAPI is most often used for building production-ready rest apis with automatic validation, serving machine learning model predictions as rest services, building crisis management and orchestration platforms, enabling real-time apis with websocket connections. Of those, building production-ready rest apis with automatic validation and serving machine learning model predictions as rest services are not what Spring Boot is typically brought in for.

Answered from the vendors’ own pages

FastAPI: Is FastAPI free to use?

Yes. FastAPI is free and open-source under the MIT License. It costs nothing to download, use, or deploy in production. An optional paid service, FastAPI Cloud, offers one-command deployment for additional convenience, but the core framework is free.

Source
Spring Boot: Is Spring Boot free?

Yes, Spring Boot is free and open-source software. The core framework is available without cost, and users can download and use it immediately.

Source
FastAPI: Can I use FastAPI for commercial applications?

Yes. FastAPI's MIT License permits unrestricted commercial use, modification, and distribution. You can build and sell products powered by FastAPI without licensing fees or restrictions.

Source
Spring Boot: What commercial support is available for Spring Boot?

While Spring Boot itself is free, VMware offers optional commercial support, training, and certification through Spring Academy. Tanzu Spring provides support and binaries for OpenJDK, Spring, and Apache Tomcat through a subscription model for enterprises requiring guaranteed support.

Source
FastAPI: Does FastAPI include a database or ORM?

No. FastAPI does not include a built-in database or ORM. You must add separate libraries like SQLAlchemy for database access. This gives flexibility to choose the database solution best suited to your project.

Source
FastAPI: What Python versions does FastAPI support?

FastAPI supports Python 3.7 and later. Older Python versions are not compatible, so you must run at least Python 3.7 to use FastAPI.

Source
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