Comparison Tool

An interactive web app for comparing Calculon vs Valhalla routing side by side.

Quick start

./tools/compare/run.sh

This starts three services:

Open http://localhost:9091 to start comparing.

Options

# Use Monaco tiles (smaller, ~32 km²)
./tools/compare/run.sh --tiles monaco

# Use France tiles (default)
./tools/compare/run.sh --tiles france

# Debug build (faster compilation, slower runtime)
./tools/compare/run.sh --debug

# Release build (default)
./tools/compare/run.sh --release

Tiles must exist at test_data/{name}_tiles/. Press Ctrl+C to stop all services.

Features

Route comparison

Click two points on the map to compute routes on both Calculon and Valhalla. The panel shows:

• Distance and time for each engine
• Percentage difference between the two
• Turn-by-turn maneuver list

Both routes are drawn on the map with distinct colors.

Matrix comparison

Switch to Matrix mode to compare many-to-many distance/time matrices. Each cell shows the difference between engines.

Verbose mode

Enable verbose mode to see per-edge cost breakdowns. Useful for diagnosing why Calculon picks a different path than Valhalla.

Graph inspection

Right-click a location to inspect the graph — shows all edges radiating from the nearest junction with their attributes.

URL state

Route coordinates, costing mode, and other settings are persisted in the URL. Share a link to reproduce a specific comparison.

Tech stack

Development

cd tools/compare
bun install
bun run dev