no one will tell you this but you can actually just use your notes app for the names, relationships, and pertinent details of people you know
even family, there's no law against it
everyone's on their phones at social events these days anyhow, no one needs to know you're discreetly checking the field marks and pronunciation guide before greeting your old friend who you definitely remembered
You can also set events on your calendar with notifications/reminders not just for people's birthdays, but also like... To remember to check on them after that job interview or ask them about their new puppy or say hi because it's been three months since your last reminder to message them
