A year ago I made Wellness Ping because someone I care about went silent and it took too long for anyone to notice.
v2.0 is now out.
It now works entirely over Signal, usernames or phone numbers, both for your check-ins and for your emergency contacts. Email isn't safe for everyone to use, but it's still there.
Three new security modules, all optional, stack as many as you want: PIN, authenticator 2FA, and passkeys.
The PIN has a duress option. Enter that one instead and your contacts get alerted immediately, while your screen says everything went fine. (really proud of this one. tweaked to the point of obsession so that response time for a duress PIN matches a normal one. nothing on your screen or in the timing gives it away.)
Also added vacation pause and custom alert messages, both of which people asked for.
v2.0 got a full security review before release. The check-in path is much harder to spoof now. Details in the release PR.
Free forever (as long as I'm alive) and open source.
oh and btw, the person who went missing, for whom I made this originally, turned out to be okay. It took a lot of time and a lot of effort to find them, but I did actually find them. I thought you might want to know that.