Contribute
STCPontual is open source and built by one person, which means help is genuinely useful rather than nominally welcome.
Code
The whole project lives at github.com/goncalovf/stcpontual — the collector, the processing pipeline and this site. Issues and pull requests are both welcome.
If you are thinking of taking on something substantial, open an issue first so we can agree on the approach before you spend an evening on it.
Tell me when the data looks wrong
This is the most valuable thing most people can do, and it needs no technical knowledge. If you know a line well and the figures here do not match what you experience at the stop, that discrepancy is worth investigating — it usually means something in the matching is off, and I have no way of noticing it from the outside.
Concrete reports help most: the line, the direction, roughly when, and what you would have expected. Open an issue or use one of the routes on the suggestions page.
Pass it on
The project is more useful the more people know it exists — riders who want to check a line, journalists writing about transport in Porto, anyone arguing about the buses with better evidence than usual. Sharing it is a real contribution.