PulseSOS is a simple SOS signalling app that uses your phone's sound, torch, screen flash with vibration to help attract attention — offline, with no account and no tracking. Two taps. Works when you have no signal. A signalling aid, not an emergency-services replacement. Available in multiple languages. Hopefully you'll never need it but if it helps save one life it's done its job.
Honestly inspiration came from rewatching Cast Away with Tom Hanks. The scene where Chuck tries to signal the ship on the horizon by waving his hand in front of the flashlight to imitate Morse Code inspired me to build this purposely simple App called PulseSOS. Someone can signal for help using their torch on their phone or their alarm or both to pulse SOS in Morse code, kept very simple because if anybody does ever need it in panic they just need to be able to use it without any complications. In reality the ship was far too distant from Chuck I'm sure that it would see this in that scenario but In these days where all kinds of tragic natural events seem to unfortunately happen far too often, if it eventually helps save one life we'll be happy.