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FastAPI FastAPI Guide

Best Hosting for FastAPI (2026)

Compare the best hosting platforms for FastAPI. We review Railway, Render, Fly.io, and serverless options with ASGI support and deployment patterns.

FastAPI requires ASGI servers (Uvicorn, Hypercorn) and platforms that support async Python. We've evaluated hosting options from PaaS to serverless.

Why This Matters

FastAPI's async performance shines with the right hosting. You need platforms supporting ASGI, proper worker configuration, and optional auto-scaling for async workloads.

Key Considerations

01

ASGI Server Support

FastAPI needs Uvicorn, Hypercorn, or similar ASGI server. Most platforms auto-detect Python and can run Uvicorn.

02

Worker Configuration

Uvicorn workers, Gunicorn with Uvicorn workers, or multiple containers. Tune for your workload.

03

Serverless Option

FastAPI works on AWS Lambda (with Mangum), Vercel Functions, and Modal. Good for variable traffic.

04

Background Tasks

FastAPI has built-in BackgroundTasks, but for heavy work, you need separate workers (Celery, ARQ).

05

Websockets

If using FastAPI websockets, ensure your platform supports persistent connections.

Our Recommendations

Railway
#1

Railway

Best Overall Excellent Support Official SDK

Railway auto-detects FastAPI and runs Uvicorn. Add PostgreSQL and Redis with one click. $5/month free credit. Excellent DX.

railway up
Website → Documentation →
Render
#2

Render

Best Free Tier Excellent Support Official SDK

Render offers free web services with spin-down. Native FastAPI detection. Good for MVPs and side projects.

render deploy
Website → Documentation →
Fly.io
#3

Fly.io

Best for Global Excellent Support Official SDK

Fly.io deploys containers globally. Excellent for low-latency APIs. Built-in PostgreSQL. 3 free VMs.

fly launch
Website → Documentation →
Modal
#4

Modal

Best Serverless Excellent Support Official SDK

Modal is built for Python. Run FastAPI as serverless functions with GPU support. Great for ML APIs. Pay per second.

pip install modal && modal deploy
Website → Documentation →
Vercel
#5

Vercel

Best for Simple APIs Good Support

Vercel Functions support Python. Good for simple FastAPI endpoints. Limited execution time. Pair with external DB.

vercel deploy
Website → Documentation →

Quick Comparison

Service TypeScript Edge Free Tier Setup Time
Railway
none ✓ $5/month credit 10 min
Render
none ✓ Free (spin-down) 15 min
Fly.io
none ✓ 3 VMs free 15 min
Modal
none ✓ $30/month credit 10 min
Vercel
none — Generous 5 min

Quick Start

FastAPI Dockerfile Dockerfile 
FROM python:3.12-slim

WORKDIR /app
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

COPY . .

CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]

Common Integration Patterns

Railway + Supabase

FastAPI on Railway, Supabase for database and auth. Simple full-stack setup.

railway supabase supabase-auth

Fly.io Global + Redis

FastAPI on Fly.io edge, Redis for caching, PostgreSQL for persistence.

fly-io redis postgresql

Modal + ML Models

FastAPI on Modal with GPU workers for ML inference APIs.

modal

Frequently Asked Questions

How many Uvicorn workers should I use? ▼
For CPU-bound: 2 * CPU cores + 1. For I/O-bound (typical API): 4 * CPU cores. Start with 2-4 and monitor.
Should I use Gunicorn with Uvicorn workers? ▼
For production, Gunicorn + Uvicorn workers provides better process management. Use: gunicorn main:app -w 4 -k uvicorn.workers.UvicornWorker
Can I run FastAPI on AWS Lambda? ▼
Yes, use Mangum as an adapter. It converts Lambda events to ASGI. Good for variable traffic APIs.
What's the cheapest FastAPI hosting? ▼
Render's free tier (with spin-down) is cheapest for low-traffic. Railway's $5 credit works for always-on. Modal is cheapest for sporadic traffic.

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Last updated: January 11, 2026