Perpetual Foreigners is a social app for adult TCKs, CCKs, and anyone who hesitates when asked where they're from. Built by Matt Macierzynski — born in Poland, raised in Cairo, shaped by seven countries — it's a space to connect with people who share the between-worlds experience. Available on iOS and Android in 175 countries. The companion Substack publication explores identity and belonging through personal essays and reflections.