Deploy and Host Bayesian Quiz on Railway

Bayesian Quiz is a real-time pub quiz app for data scientists where players estimate numerical answers with uncertainty. Instead of just guessing a number, participants submit a probability distribution (mean + standard deviation), and scoring uses CRPS to reward both accuracy and well-calibrated confidence.

About Hosting Bayesian Quiz

Bayesian Quiz is a single Python service with no database — all game state lives in memory. It uses FastAPI with Server-Sent Events to push real-time state changes to all connected clients: the quizmaster control panel, the projector display, and player phones. Railway's public domain is automatically used for the QR code that players scan to join. The in-memory architecture means it must run on a single node (no horizontal scaling), but it has been load-tested with 100 concurrent players on one instance. Quiz questions are uploaded as environment variables — use just upload-quiz with the Railway CLI to set a QUIZ_ variable from a text file.

Common Use Cases

Running a statistics-themed pub quiz at meetups, conferences, or team offsites
Teaching calibration and probabilistic thinking in a fun, competitive format
Conference entertainment for data science and ML communities (e.g., PyData, SciPy)

Dependencies for bayesian-quiz Hosting

Python 3.14+
No database required (in-memory state)
Quiz questions in RFC 822-style text format, uploaded via environment variables
FastAPI — web framework
HTMX — real-time UI updates via SSE
uv — Python package manager (used as build system)

Deployment Dependencies

Railway CLI — for uploading quiz files
Just command runner

Why Deploy bayesian-quiz on Railway?

Railway is a singular platform to deploy your infrastructure stack. Railway will host your infrastructure so you don't have to deal with configuration, while allowing you to vertically and horizontally scale it.

By deploying Bayesian Quiz on Railway, you are one step closer to supporting a complete full-stack application with minimal burden. Host your servers, databases, AI agents, and more on Railway.