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Billy is an OpenSource billing system which can be self hosted on your WordPress website. It makes use of standard Gutenberg Block Editor components with a simple editing experience, decreases the learning curve and reduces the employee onboarding time.
The Free version can be installed from the WordPress Plugin Directory.
The Pro version is an add-on with additional features like Contacts management (CRM), QR code payments and billing stats.
Free
You can find all relevant information and screenshots in the WordPress Plugin Directory.
Pro
Below are some screenshots of features that are only available in the premium add-on.
For demonstration purposes the TwentyTwenty WordPress theme has been used but the plugin also works with any modern theme that supports the WordPress Block editor.
Dashboard Widget with Birthday Reminder 
Admin Columns 
Invoices or Quotes via a password protected Share link 
Contact Selector (Backend, TwentyTwenty Theme) 
QR code based billing feature (Frontend, TwentyTwenty Theme) 
Accounting Chart of Earnings/Expenses (TwentyTwenty Theme) 
Accounting Client overview with Chart (TwentyTwenty Theme) 
Contact Post (Backend, TwentyTwenty Theme) 
Contact Post (Frontend, TwentyTwenty Theme) 
Address Book with real-time search (TwentyTwenty Theme)
