I hosted the same Flask, Django and FastAPI apps on 6 free Python hosts. Here is what held up.
TL;DR: We put the same Flask, Django and FastAPI apps on six places that host Python for free (SnapDeploy, Render, Railway, PythonAnywhere, Google Cloud Run, Vercel) with production Dockerfiles. Below
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Proof Over Promises.
Running the same three apps on every host makes the comparison table a lot more useful than the usual feature lists. The health check endpoint habit is a good one to call out, since a host can report a container as running while the app inside never finished booting. Did any of the six handle cold starts noticeably worse for the Django app than for FastAPI?