My husband and I plan to go Australia . I am working in Singapore and he is in the Philippines.
Can I apply for our visa together online?
You will need to apply separately but your applications can be processed together.
The Australian government's Visitor visa page states:
You can't include family members in your application. A separate application must be made for each member of your family, including those listed on your passport.
If other family members are applying for this visa, your applications can be processed together. Learn more when you apply for the visa.