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Full‑featured accounting suite with unlimited free invoicing, receipt scanning, and a native iOS/Android app for real‑time cash‑flow monitoring.
#3 Zoho Invoice
Free for up to 5 customers; offers a sleek mobile app, automated payment reminders, and multi‑currency support.
Open‑source platform with a generous free tier (unlimited invoices, clients, and proposals) and responsive mobile web interface.
Create and send invoices directly from the PayPal mobile app; recipients can pay instantly with a PayPal or card.
Free invoicing tool integrated with Square payments; mobile‑first design lets you email or text invoices on the go.
#7 Invoicely
Unlimited free invoices for a single business, with a mobile‑responsive dashboard and basic reporting.
#8 SlickPie
Free cloud accounting with auto‑data entry and a mobile‑optimized UI for quick invoice creation.
#9 ZipBooks
Free starter plan includes unlimited invoices, expense tracking, and a clean mobile app for iOS and Android.
Free for 1 user and 2 projects; mobile app supports time tracking, invoicing, and expense logging.
#11 Invoice Simple
Free tier lets you generate up to 5 invoices per month from a dedicated mobile app with customizable templates.
#12 Akaunting
Open‑source accounting software with a responsive web app; free invoicing module works well on smartphones and tablets.
#13 Simple Invoices
Lightweight open‑source invoicing system; mobile‑friendly UI and no cost for unlimited invoices.
Free for up to 3 clients; mobile‑optimized dashboard, recurring invoices, and PDF export.
Free for 1 user; combines project management with invoicing, and offers a mobile app for on‑the‑go billing.
#16 Brightbook
Completely free UK‑focused accounting suite with unlimited invoicing and a mobile‑responsive interface.
#17 Invoice Home
Free basic plan includes unlimited invoices and a mobile‑ready editor; premium features optional.
Self‑hosted invoicing tool with a clean responsive design; ideal for entrepreneurs who want full control.
Free for a single app; Odoo’s invoicing module works on any mobile browser and integrates with its ERP suite.
#20 InvoicePlane
Open‑source invoicing and client management system with a mobile‑responsive UI; no subscription fees.
Free open‑source ERP that includes invoicing; fully responsive layout works on smartphones and tablets.
#22 Billdu
Free tier offers unlimited invoices and a dedicated iOS/Android app with QR‑code payment links.
#23 Fakturama
Desktop‑first open‑source invoicing software with a mobile‑friendly web interface for quick invoice access.
14‑day free trial with full mobile app; great for testing advanced features before committing.
30‑day free trial; mobile app provides invoice creation, payment tracking, and client communication.
30‑day trial with a robust mobile app; supports unlimited invoices during the trial period.
Free 30‑day trial; mobile app lets you draft and send invoices, view balances, and accept online payments.
Free 30‑day trial with a mobile‑first design; includes invoicing, expense tracking, and time‑sheet integration.
Free 30‑day trial; mobile app focuses on freelancers and gig workers with simple invoice templates.
30‑day free trial with a clean mobile app for invoicing, expense capture, and real‑time reporting.
Free 14‑day trial; mobile app combines invoicing with full accounting capabilities.
Standalone mobile app for Wave’s free invoicing; lets you create, send, and track invoices without a desktop.
Dedicated mobile app for the free tier of Invoice Ninja, offering instant invoice creation and client management.
Official Zoho Invoice app optimized for freelancers; free tier supports unlimited invoices for up to 5 clients.