Transgender woman Roxanne Tickle is suing the female-only app Giggle for Girls, claiming gender identity discrimination.

This landmark case is the first regarding such discrimination to be heard by a federal court.

Tickle has been excluded from the app due to a gender verification process involving a selfie and gender detection software.

The legal argument hinges on the distinction between gender identity and biological sex, with Tickle identifying as a woman and Giggle defending its biological sex-based policy.

The Australian Human Rights Commission is providing support for the case, indicating its significance.

A crowdfunding campaign is financing Giggle's legal defense, showcasing public interest and support for the platform.

The trial is expected to last four days, with the court setting a clear stance against any form of intimidation or harassment related to the case.