Development Tools · head to head
Deno vs FastAPI
D
Deno
Development Tools
A fast, open-source, fully Node-compatible JS runtime with TypeScript baked right in
- From
- Free
- Rated
- -
F
FastAPI
Web Development
A modern, fast, high-performance web framework for building APIs with Python
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Deno the runtime itself is MIT licensed per the project's GitHub repository (denoland/deno LICENSE.md) with no cost, but Deno Deploy's free tier caps at 1 million requests and 15 CPU hours per month, per deno.com/deploy/pricing (Aug 2026); 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 Deno and FastAPI actually diverge.
Identical on both: starting price (Free), free tier (Yes), platforms (Web), user rating (Not yet rated).
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Deno
- The runtime itself is MIT licensed per the project's GitHub repository (denoland/deno LICENSE.md) with no cost, but Deno Deploy's free tier caps at 1 million requests and 15 CPU hours per month, per deno.com/deploy/pricing (Aug 2026)
- Deno Deploy Pro at $20 per month charges $2 per additional million requests and $0.05 per additional CPU hour once the included quota is exceeded, per deno.com/deploy/pricing
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
Deno
FreeNo published plan breakdown. See the Deno review.
FastAPI
FreeNo published plan breakdown. See the FastAPI review.
Which should you pick?
Questions people ask
- Is Deno or FastAPI better?
- Neither clearly leads. Deno 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, Deno or FastAPI?
- Deno starts at Free and FastAPI at Free.
- Does Deno or FastAPI run on more platforms?
- Both run on Web, so platform support will not decide this one for you.
- Can I use Deno for free?
- Both have a free tier, so you can try either at no cost before committing.
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