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#2 Wave
Free invoicing and accounting suite with automatic sync to Wave’s own bookkeeping, plus integrations for PayPal, Stripe, and tax filing.
Free for up to 5 customers; integrates with Zoho Books, Xero, and QuickBooks Online for smooth data flow.
Open‑source invoicing with unlimited invoices; native integrations with Stripe, PayPal, QuickBooks Online, and Xero.
Create and send invoices for free; automatically records payments in PayPal and can export to QuickBooks and Xero via connectors.
Free invoicing tool that syncs sales data with Square’s POS and accounting integrations for QuickBooks Online and Xero.
#7 Invoicely
Free tier supports unlimited invoices; integrates with PayPal, Stripe, and can export CSV for import into most accounting software.
#8 Akaunting
Open‑source, cloud‑ready accounting platform with built‑in invoicing; integrates directly with Stripe, PayPal, and popular ERP add‑ons.
#9 InvoicePlane
Self‑hosted PHP invoicing system; free and integrates via plugins with QuickBooks, Xero, and other accounting APIs.
#10 Brightbook
UK‑focused free invoicing and bookkeeping tool; syncs with Xero and offers automatic bank feed connections.
#11 SlickPie
Free invoicing and expense tracking; integrates with PayPal, Stripe, and can push data to QuickBooks Online.
#12 Simple Invoices
Open‑source invoicing app; exports data in CSV/JSON for easy import into accounting platforms like QuickBooks and Xero.
Free for up to 5 users; includes invoicing with time‑tracking data that can be exported to QuickBooks and Xero.
Time‑tracking meets invoicing; integrates directly with QuickBooks Online, Xero, and FreshBooks.
While primarily accounting, its invoicing module is free for very small businesses and syncs natively with Zoho Invoice and other Zoho apps.
Freelancers can send unlimited invoices; integrates with Stripe, PayPal, and exports to QuickBooks Online.
Free 30‑day trial includes invoicing with direct sync to Sage’s accounting core and third‑party apps like Xero.
Open‑source ERP; free invoicing module that integrates with Odoo Accounting and can be linked to external tools via API.
30‑day free trial with invoicing that syncs automatically to Kashoo’s accounting engine and supports QuickBooks import.
Standalone invoicing app; integrates with Zoho Books, Xero, and QuickBooks Online for seamless accounting.
30‑day free trial offering invoicing that directly posts to its accounting dashboard and can export to Xero.