Invoice App is a cloud‑based invoicing tool aimed at freelancers and small businesses. If you’re looking for free invoicing solutions that can replace or complement Invoice App, the list below gathers 20 popular options that offer a no‑cost tier (or are completely open‑source) with core invoicing features such as quote creation, PDF export, payment‑gateway integration, and basic reporting.
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All‑in‑one free accounting platform with unlimited invoices, receipt scanning and basic payroll for U.S. & Canada.
Free for up to 5 customers; supports recurring invoices, multi‑currency, and online payment gateways.
Open‑source SaaS with a generous free plan (up to 100 clients) offering customizable invoices, time‑tracking, and payment integrations.
Free tier allows unlimited invoices for an unlimited number of clients, with basic reporting and multiple currency support.
Create and send invoices at no cost; you only pay transaction fees when a client pays via PayPal.
Free invoicing tool that integrates with Square payments; pay only per transaction when the invoice is settled.
Free plan includes unlimited invoices, basic reporting, and time‑tracking for a single user.
Free online invoicing with auto‑data entry via MagicBot, multi‑currency, and tax calculations.
Free for 1 user & 2 projects; includes time‑tracking, expense logging and simple invoicing.
Open‑source, self‑hosted accounting suite with unlimited free invoices, expense tracking, and multi‑currency support.
Free open‑source ERP; the Invoicing module lets you create and send unlimited invoices with basic accounting.
Lightweight open‑source PHP application for creating PDF invoices, suitable for small businesses and freelancers.
Self‑hosted, open‑source invoicing system with unlimited clients, quotes, and recurring invoices.
Free cloud‑based invoicing for freelancers; includes client portal, recurring invoices, and basic reporting.
Free starter plan offers unlimited invoices, contract templates, and basic time‑tracking for freelancers.
Open‑source desktop invoicing software (Windows, Linux, macOS) with multi‑currency, tax handling, and PDF export.
Free open‑source suite; the invoicing module provides unlimited invoices, product catalog, and basic accounting.
Completely free, web‑based invoicing system with unlimited clients, recurring invoices, and PDF generation.
Free plan for freelancers (up to 5 invoices per month) with customizable templates and online payments.
Open‑source desktop accounting app (Windows/macOS/Linux) offering free invoicing, expense tracking, and bank reconciliation.