InvoiceDeck - Offline invoice maker
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InvoiceDeck helps freelancers, field service pros, and small studios create professional invoices right after a job. Manage business details, clients, and invoices offline; calculate quantities, tax, and discounts; then generate a clean document without an account or cloud dependency.

Replies
Being able to track payment status and send gentle reminders for overdue invoices would be huge, since chasing payments eats up so much time after the job is already done.