Also worth knowing
A non-government lookalike domain (eVisa.ST, run by a private tour company) exists alongside the real government portal (smf.st/evisa), worth flagging since a traveler could easily land on the wrong one. Visitors holding a valid Schengen or US visa may enter for up to 15 days without a separate Sao Tome visa, a cross-visa provision based on possessing another visa rather than nationality, not modeled per passport country.