Status: inferred · Last reviewed: 2026-07-15
Render documents a direct FastAPI web-service deployment and is the simplest free demo path. Railway supports repository, CLI, template and Docker workflows, but its current entry model should be treated as trial or low-cost rather than forever-free compute.
Use Render with Uvicorn for the clearest free FastAPI demo.
Bind to `0.0.0.0` and the platform's injected port.
Use an external managed Postgres database and a production connection pool.
Accept idle sleep for demos and upgrade before serving latency-sensitive clients.
Render Render Services Inc. Render is a unified cloud to build and run all your apps and websites with free TLS certificates, a global CDN, private networks and auto deploys from Git.
Free tier
750 hours/month for web services
Paid from $7/mo · 4 regions
Railway Railway Corp Railway is an infrastructure platform where you can provision infrastructure, develop with it locally, and then deploy to the cloud.
Free tier
30-day trial with $5 usage credit, then $1/month minimum
Paid from $1/mo · 4 regions
Fly.io Fly.io Inc. Fly.io transforms containers into micro-VMs that run on their hardware in cities close to your users.
No free tier
Use Pydantic validation, explicit CORS origins, timeouts and structured logs. Keep CPU-heavy work outside request handlers and use background infrastructure only when the host supports it. The free instance is for verifying architecture, not guaranteeing response time.
Yes for demos on a Render Free web service, with sleep and resource limitations. Railway and Fly.io should be evaluated under current trial or usage pricing.
Confirm the module path, bind host and injected port. The common command is `uvicorn main:app --host 0.0.0.0 --port $PORT`.
It is useful for a public API demo. Disable or protect it when endpoint discovery or schemas contain sensitive operational information.