Overview
- The app requires users to confirm they are safe each day or at least every other day, emailing a designated contact if check-ins lapse.
- In China it is the top paid iPhone app at a price of 8 yuan, and it appears internationally as Demumu for about €0.99 with placements in the U.S., Singapore, Hong Kong, Spain and Australia.
- Users have criticized the name and asked for SMS alerts instead of email, while the developers say they plan in-app messaging and improved accessibility for older users and are weighing community input on a new name.
- The developers are reported to be three founders born in the mid‑1990s, with media accounts describing a low development cost and noting unverified talk of a possible minority stake sale.
- The surge has intensified discussion about isolation in China, where forecasts project up to 200 million single-person households by 2030.