cityparity compares two cities on the numbers that actually decide a move. Give it a salary and a family situation and it returns take-home pay, a full cost breakdown (housing, healthcare, childcare, food, transit, travel home, property tax), the equivalent salary you'd need in the target city, and the non-cash deltas people move for: statutory vacation, parental leave, and universal healthcare. It can also rank cities by a composite quality score and look up inbound-worker tax regimes (Italy impatriati, Portugal IFICI, and others). About 165 cities across 69 countries. Free, no API key, hosted Streamable HTTP.