If you use 1SE on an iOS device, besides Google and email & password, you can sign up for an account using your Apple ID.
Download the app, then tap "Start Creating." After it, you'll see an offer for a PRO free trial. You can take it or not, totally up to you.
If you have been using the app on an iOS device without an account, go to the "Profile" tab and tap the "Sign In or Create Account" button. Please note that this won't delete your current snippets!
- Select the "Continue with Apple" button.
- Select the "Continue" button in the alert presented.
- Choose to use your email address or a private one to create the 1SE account.
- Confirm with Touch ID.
- Follow the prompts given to create your account.