1. pip install yeouia
2. Add AUTHENTICATION_BACKENDS = ['yeouia.backends.YummyEmailOrUsernameInsensitiveAuth'] to your settings.py
3. Enjoy

Tested for

• Python 3.10, 3.11, 3.12
• Django 5+

May work otherwise, but you should run tests :P

Django's default auth username is not case insensitive. (See #2273 and #25617)

But… Who cares ?

This backend tries:

1. username, case sensitive
2. username, case insensitive
3. email, case insensitive

And follows #20760.