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Invoicing Tools in 2026

Square Invoices

★★★★☆ 4.3 (6,000)
Finance Accounting Invoicing

Square's free invoicing tool for sending professional estimates and invoices with online payment acceptance.

Invoice Ninja

★★★★★ 4.5 (3,000)
Finance Accounting Invoicing

A free open-source invoicing and payment platform for freelancers and small businesses with time tracking and proposals.