No. Your sign-in method is set when you create your account and can't be changed afterward — that applies to Google, Apple, and email/password.
If you want to use a different sign-in method, you'd need to delete your current account and create a new one. A different sign-in method starts a fresh account, so your account history and autopayments don't carry over. Your history and your Split Pay account and routing numbers only come back if you sign up again with the same email and sign-in method you used before.
If you're locked out of the method you originally used, contact us at splitpay.com/help. If you sign in with an email and password, we may be able to verify your identity by text and send you a password reset link; if you sign in with Google or Apple, we're not able to restore sign-in right now.
Note for Apple users: If you signed up with "Sign in with Apple," your account email may show as either your iCloud address or as a private relay address (something like xxxxx@privaterelay.appleid.com). Both are valid — Apple's private relay forwards email to your real iCloud inbox without exposing it.
⚠️ Important — read before deleting: If you pay your bills through a portal, lender, or mortgage servicer using Split Pay account and routing numbers, do not delete your account. Your Split Pay account and routing numbers are tied to your identity and stay with you — individuals only get one Split Pay account. Deleting yours would orphan the payments saved in your portal or with your lender. Keep your current sign-in method instead, and contact support if you're having trouble signing in.