Data sources and licences
A product that says “we do not invent numbers” has to be able to show where they come from. Below is every external source, what we use it for and under which licence — including those that require us to name them.
Eurostat
Regional seasonality — the year curve for every market
Licence: CC BY 4.0 (Decision 2011/833/EU)
Statistics Poland — Local Data Bank
Regional occupancy as a reference point, and figures about the market
Licence: CC BY 4.0
MET Norway
Weather forecasts for markets
Licence: CC BY 4.0
OpenStreetMap
Names and locations of nearby accommodation
Licence: ODbL — © OpenStreetMap contributors
OpenHolidays API
School and public holidays
Licence: ODbL
ΓΕΜΗ (GEMI)
Choosing Greek markets: accommodation businesses per municipality
Licence: ODC-BY 1.0
OpenAgenda
Cultural events in France
Licence: API under our own account; service terms, not an open licence
Natural Earth
Country borders on the coverage map
Licence: Public domain
Organisers' official calendars
Events: arenas, stadiums, exhibition centres, city halls
Licence: Publicly published schedules; every entry is approved here by a person
Required notices
Six of these sources (the ODbL, ODC-BY and CC BY 4.0 licences) require the author to be credited wherever the data is used. This page is that credit, and a link to it sits in the footer of every page.
Typefaces
The site is set in two typefaces under the SIL Open Font License 1.1: Manrope for headings and Geist for body text. We serve the files from our own server, so the browser contacts nobody's CDN along the way — a decision about privacy, not performance.
What we do not take
We do not collect competitors' prices from booking portals. This is not a technical difficulty but a matter of terms: Booking.com forbids it outright and nocowanie.pl requires a consent we do not have. Neighbours' prices are entered by the host, by hand, for a chosen night.