
E-Invoice.Space
E-Rechnungs-Studio.de
InvoiceIn
Invoice-Converter.com
E-Invoice Map
OctoPDF
NormAPI
Mustangproject is a open source library and command line tool for FacturX/ZUGFeRD, a PDF-based format for electronic invoices.
LayerStack’s Arm-based cloud virtual machines, powered by cloud-optimized CPU based on Arm architecture that deliver excellent cost-effective processing power, allowing you to easily complete the most demanding application development.
Which is more popular?
Based on our record, Mustang Project seems to be more popular. It has been mentioned 1 time since March 2021.
Website, pricing, platforms and company facts side by side.
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Recommendations tracked on public social media and blogs since March 2021.

If you build accounting software, an ERP, or any e-commerce flow that touches EU customers, you'll likely need to validate these invoice formats at some point. The two main open-source Schematron engines are phive (by Philip Helger of... - Source: dev.to / 6 months ago
Tracking LayerStack Arm-based Cloud Server since Jun 2024.
When comparing Mustang Project and LayerStack Arm-based Cloud Server, you can also consider the following products.

Simple PDF files become machine-readable, XML invoices become human-readable.
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PDF to XRechnung and ZUGFeRD converter, validator and viewer.
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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.
Compare InvoiceIn to Mustang Project or LayerStack Arm-based Cloud Server:

Convert existing PDF invoices into validated XRechnung, ZUGFeRD, Factur-X and UBL e-invoices—without replacing your accounting software. Use our web interface to review everything or automate it using API, zip-upload or e-mail.
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Free e-invoice tools: check if a company is on Peppol, open XRechnung, Factur-X and UBL files in your browser (nothing uploaded), see deadlines by country.
Compare E-Invoice Map to Mustang Project or LayerStack Arm-based Cloud Server:

Free online verifier for PDF/A, PDF/UA, ZUGFerD/Factur-X and digital signatures.
Compare OctoPDF to Mustang Project or LayerStack Arm-based Cloud Server: