We ask that you use a strong password. Sorry, we know passwords can be a pain. You must use 8 characters and a combination of letters and numbers. We suggest using special characters too. Each user in Stretch (excluding Pets--for now!) has a separate account. We discourage sharing accounts and credentials.
After the beta period we plan to offer mobile phone verification (what tech people calls 2-factor authentication). Mobile phone verification allows you to receive a short numeric code each time you use Stretch on a new device (a phone, table, computer, or watch). This will ensure we know it's really you.
The iOS mobile app also has TouchID and a PIN Code built in for enhanced security.