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Web Development · head to head

FastAPI vs Spring Boot

F

FastAPI

Web Development

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

From
Free
Rated
-
Full reviewWebsite
S

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 licensed under the MIT License per fastapi.tiangolo.com; as open source software it has no paid tier or vendor price to compare; 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

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).

Where each one falls short

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

FastAPI

  • Licensed under the MIT License per fastapi.tiangolo.com; as open source software it has no paid tier or vendor price to compare
  • FastAPI depends entirely on Starlette for its web layer and Pydantic for validation, per its own documentation, so it is not a standalone framework and inherits both dependencies' constraints

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.
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