Software · head to head
Spring Boot vs FastAPI
S
Spring Boot
Software
Stand-alone, production-grade Spring based applications that you can just run
- From
- Free
- Rated
- -
F
FastAPI
Software
A modern, fast, high-performance web framework for building APIs with Python
- From
- Free
- Rated
- -
The short version
- Each has a real cost: 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; FastAPI licensed under the MIT License per fastapi.tiangolo.com; as open source software it has no paid tier or vendor price to compare
Where they differ
Only the attributes on which Spring Boot and FastAPI actually diverge.
| Attribute | Spring Boot | FastAPI |
|---|
Identical on both: starting price (Free), pricing model (open-source), free tier (Yes), platforms (Web), user rating (Not yet rated), category (Unknown).
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
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
Pricing, plan by plan
Spring Boot
FreeNo published plan breakdown. See the Spring Boot review.
FastAPI
FreeNo published plan breakdown. See the FastAPI review.
Which should you pick?
Questions people ask
- Is Spring Boot or FastAPI better?
- Neither clearly leads. Spring Boot starts at Free and FastAPI at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Spring Boot or FastAPI?
- Spring Boot starts at Free and FastAPI at Free.
- Does Spring Boot or FastAPI run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Spring Boot for free?
- Both have a free tier, so you can try either at no cost before committing.