Stealth mode is the practice of withholding the company's product, customers, or even existence from public view during early development. Founders use it to avoid alerting incumbents, to preserve optionality on positioning, or to delay competitive scrutiny while the technical thesis is still being proven.
Stealth has become less common in the SaaS era, where customer discovery typically benefits from public design partners and content marketing. It still appears in deep tech, regulated industries, and acquihire-track teams that prefer to negotiate quietly.