
NormAPI
E-Rechnungs-Studio.de
E-Invoice.Space
Mustang Project
InvoiceIn
Invoice-Converter.com
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.
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.

Website, pricing, platforms and company facts side by side.
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LayerStack Arm-based Cloud Server
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| Website | aidoks.eu | layerstack.com |
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| Company | Startup from Latvia · 2026 | — |
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In their own words, as submitted to SaaSHub.

aiDoks is a European e-invoicing platform for small businesses and accountants. Generate compliant e-invoices in PEPPOL BIS 3.0, XRechnung (UBL & CII), Factur-X/ZUGFeRD PDF, Spanish Facturae and Estonian e-arve — or upload an existing PDF and let AI extraction fill the invoice for you....
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As answered by people managing aiDoks.eu and LayerStack Arm-based Cloud Server.
aiDoks.eu's answer
aiDoks covers the whole EU e-invoicing workflow — generate, validate, and convert — in one free web tool, across formats that usually require separate tools: PEPPOL BIS 3.0, XRechnung (UBL & CII), Factur-X/ZUGFeRD, Spanish Facturae and Estonian e-arve. Validation runs the official schematron rule sets used by KoSIT, PEPPOL and national authorities, including country CIUS rules for Germany, France, Romania, the Netherlands, Portugal and Spain. And you can upload an existing PDF invoice and let AI extraction fill the e-invoice for you.
aiDoks.eu's answer
Most free alternatives do one thing: a validator here, a ZUGFeRD library there — and many require signup, watermark the output, or assume developer skills. aiDoks is built for non-technical users: no signup for the first use, watermark-free XML, plain-language validation errors with rule IDs, and format conversion (PDF → e-invoice, CII ↔ UBL, Facturae → UBL, e-arve → UBL) that standalone validators don't offer. Pro is $4.85/month for unlimited use — a fraction of typical e-invoicing platform pricing.
aiDoks.eu's answer
Small businesses, freelancers and accountants in Europe who need to send or check compliant e-invoices without an ERP system — especially in Germany, France, Belgium, Spain and Estonia, where e-invoicing mandates are already in force or arriving (France's B2B mandate starts 1 September 2026). Also useful for developers and consultants who need a quick validator against the official rule sets.
aiDoks.eu's answer
Europe's e-invoicing mandates are rolling out country by country, but the tooling was built for large enterprises — small businesses were left choosing between expensive platforms and raw XML. aiDoks started as a simple free validator and grew into a full toolset: generators, validators and converters for every major European format, with AI-powered PDF extraction so nobody has to type an invoice twice. It's built in Latvia and available in seven European languages.
aiDoks.eu's answer
Java 21 with Spring Boot on the backend, Angular on the frontend, PostgreSQL for storage. Validation uses ph-schematron with the official EN 16931, PEPPOL, KoSIT and national CIUS rule sets. PDF invoice extraction is powered by Azure AI Document Intelligence.
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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.
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PDF to XRechnung and ZUGFeRD converter, validator and viewer.
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Simple PDF files become machine-readable, XML invoices become human-readable.
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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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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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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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