“Invoice Marcus Hale for unblocking and jetting the drain today, $350 plus GST.”
Saves your business details and your ABN, so the next one is just the sentence.
The customer, the job, the price. One sentence, the way you would say it to a mate. Too noisy on site? Type it instead.
Was $350 before or after GST? Two big buttons, each showing what the customer ends up paying. Tap one and it is done.
A proper tax invoice as a PDF, out the door from your phone. Email it, download it, or share it before you pack up.
Plain and bank-like, because it goes to your customer and to their bookkeeper. Your ABN, the date, a unique reference, and GST on its own line.

Business name, ABN, GST registration and where the money goes. Filled in on every invoice after this one, instead of typed on a phone at the back of a ute.
The people you invoice and the rates you charge them are kept as you go. Say the name and the details come with it.
Numbered in a real sequence, kept in one list, and still there when the phone goes in the drink. Without an account they last 24 hours on the device that made them.
Free, and it takes an email address and a password. You can keep using Invoice without one for as long as you like.
Record after the job while it is still fresh, check the price, and send it before you drive away.