- v1Solo ScoreThe index by destination and traveller profile: nine components, public weights, sources.
- UN · EurostatSingles mapMen-to-women ratio aged 20-39 and one-person households, country by country. With causes, not clichés.
- ERA5Walking weatherMonthly 2016-2025 averages for every city from Open-Meteo / ERA5, plus our comfort index.