
Zoho Invoice
FreshBooks
Wave Financial
QuickBooks Online
invoicely
Invoice Generator
InvoicePlane
Invoice Ninja is a free, open-source solution for invoicing and billing customers.

aiDoks.eu
InvoiceIn
Mustang Project
E-Rechnungs-Studio.de
E-Invoice.Space
Invoice-Converter
GetInvoice
REST API for German e-invoices: generate XRechnung (UBL/CII) and ZUGFeRD from JSON, and validate XML and PDF invoices against the official KoSIT rule set, with a plain-language explanation for every business-rule finding. Validation is free.
Which is more popular?
Based on our record, Invoice Ninja seems to be more popular. It has been mentioned 7 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | invoiceninja.com | normapi.com |
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In their own words, as submitted to SaaSHub.


No description of Invoice Ninja yet.
NormAPI generates XRechnung (UBL and CII) and ZUGFeRD invoices from JSON and validates XML and PDF invoices against the official KoSIT rule set, as a REST API and as a free browser validator without sign-up. Generated invoices are validated before they are returned, every response names the...
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
INVOICE NINJA REVIEW ๐ธ TUTORIAL ๐ฆ INSTALL (SELF HOSTED) ๐ป $50 FREEBIE ๐ฐ
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How often each product is chosen within a category, 0โ100% relative to the other.


Share your experience with using Invoice Ninja and NormAPI. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


Let's look at this scenario: Tom is the owner of TMZ Marketing, a digital marketing firm that services small to medium-sized businesses in LA. He invoices all his clients on the 20th of every month using Sage, a...
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Recommendations tracked on public social media and blogs since March 2021.


I didnt see https://invoiceninja.com/ get mentioned yet, but it is my favorite software solution in this space. You can self host it or pay them for hosting. PDF generation and alot more. - Source: Hacker News / about 3 years ago
I've used https://invoiceninja.com/ when I did freelance work. Source: over 3 years ago
I've been liking Invoice Ninja (https://invoiceninja.com/), though I don't know about asset depreciation though. Source: over 3 years ago
Tracking NormAPI since Oct 2026.
When comparing Invoice Ninja and NormAPI, you can also consider the following products.

100% free online invoicing software for small businesses.
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Create, edit and view e-invoices online for free. Convert PDF to e-invoice, transform invoice XML to PDF, and generate UBL 2.1 with OCR scanning, EU VAT validation, and PEPPOL BIS 3.0 compliance.
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The ideal accounting software for small business owners.
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POST any e-invoice you receive. Get canonical EN 16931 JSON, validation with fix hints, PDF, CSV and DATEV back. Nothing stored.
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Award-winning financial software designed for entrepreneurs.
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Mustangproject is a open source library and command line tool for FacturX/ZUGFeRD, a PDF-based format for electronic invoices.
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