Audience
Software teams and SaaS vendors that issue or check German e-invoices (XRechnung, ZUGFeRD)
About NormAPI
NormAPI is an e-invoicing API for software teams that issue or check German e-invoices in the XRechnung and ZUGFeRD formats.
It has two endpoints. Validation checks an invoice (UBL, CII or ZUGFeRD PDF) against the official KoSIT rule set and returns every finding as JSON, with its rule code, severity and location in the document. Generation turns invoice data sent as JSON into a validated XRechnung (UBL or CII) or ZUGFeRD PDF. Rule-set updates are included: KoSIT publishes a new version roughly every six months, and the version in force is reported with every result. A TypeScript client is available on npm.
The same validation runs in a free browser validator that needs no sign-up and never stores invoice content, and 137 of the 307 rules have a plain-language reference page explaining what they mean and how to fix them.
Validation is free. Generation costs EUR 49 a month for 500 invoices or EUR 149 for 2,500, and an account includes 25 generated invoices a month for free.
Other Popular Alternatives & Related Software
E-Rechnung Pro
E-Rechnung Pro is a browser-based e-invoicing tool for freelancers, small businesses and accounting professionals that need to prepare ZUGFeRD or Factur-X documents. Users can create hybrid PDF/A-3 invoices with embedded XML in BASIC, EN 16931 and EXTENDED profiles, convert existing PDF invoices into hybrid files with OCR-assisted extraction for scans, and validate ZUGFeRD, Factur-X and XRechnung documents against EN 16931 rules. A document area provides history, status and search for invoices and validation results. The service runs online without installation and supports English, German, French and Ukrainian interfaces. Users can review validation messages and download files for further handling in their existing workflows.
Learn more about E-Rechnung Pro
Coretool
Coretool is a browser-based invoicing application for German businesses, freelancers, sole traders, tradespeople, and small service businesses. Users can create and manage quotes and invoices, including XRechnung and ZUGFeRD e-invoices, track customers, send payment reminders, and organize appointments. The app supports GiroCode QR codes, digital quote signatures, and validation of e-invoice documents through its REST API. API-based workflows can connect with automation tools such as Make, Zapier, and n8n; availability of some platform-specific modules may depend on approval. Calendar feeds can be added to Google, Apple, or Outlook calendars. The optional Kalkulations-Assistent supports project estimates, material and labor calculations, and quote creation. Coretool runs in a web browser without local installation. Its free plan allows three invoices per month; Solo costs €9/month plus VAT and can be canceled monthly.
Learn more about Coretool
Storecove
Send & receive e-invoices with PEPPOL. Safely send to international governments. For ERP: Connect your software to Peppol with an easy RESTful API.
Why E-invoicing?
- The costs of sending e-invoices is 59% cheaper and receiving costs are reduced by 64%.
- Paper invoicing requires paper filing, retention and storage space, which costs time and money. E-invoices are send from bookkeeping system to bookkeeping system, fully in the cloud without physical interference.
- You can no longer send PDF or paper invoices to governments, ministries or public entities. With Peppol you can send your e-invoices to governments worldwide, all according to the newly established European Directive.
Are you an ERP system / accounting software? You can enable e-invoicing for your own customers using an easy RESTful API. Customers can then send & receive e-invoices from within your own software, easily connect to the Peppol network and send e-invoices to government
Learn more about Storecove
InvoiceXML
InvoiceXML is an API-first platform for European e-invoice compliance. A single REST API generates, validates, and converts every major format covered by EN 16931: Factur-X, ZUGFeRD, XRechnung, UBL, and CII.
Generation accepts clean JSON input and returns a compliant XML document, or a PDF/A-3 hybrid invoice with the XML embedded according to format-specific rules. Validation runs the official Schematron rulesets, and returns structured results plus user-friendly plain-language explanations alongside the raw rule output.
Format conversion (POST /v1/convert/{from}/to/{format}) maps any supported format to any other through a canonical internal representation. A separate /v1/transform/ namespace handles AI-assisted extraction from legacy PDF invoices into structured XML.
No-Code integrations expose the core operations to non-developers. MCP server provides the compliance toolkit for AI Agentic workflows. Always up to date with the latest standard requirements - zero maintenance.
Learn more about InvoiceXML
Pricing
Starting Price:
€49 per month
Free Version:
Free Version available.
Integrations
API:
Yes, NormAPI offers API access
No integrations listed.
Company Information
NormAPI
normapi.de
Videos and Screen Captures
Other Useful Business Software
Custom VMs From 1 to 96 vCPUs With 99.95% Uptime
Live migration and automatic failover keep workloads online through maintenance. One free e2-micro VM every month.
Product Details
Platforms Supported
Cloud
Training
Documentation
Support
Online
NormAPI Frequently Asked Questions
Q: What kinds of users and organization types does NormAPI work with?
NormAPI works with these users and organization types: Mid Size Business, Small Business, Enterprise, Freelance, Nonprofit, Government, and Startup.
Q: What languages does NormAPI support in their product?
NormAPI supports these languages: English and German.
Q: What kind of support options does NormAPI offer?
NormAPI offers support via online.
Q: Does NormAPI have an API?
Yes, NormAPI has an API.
Q: What type of training does NormAPI provide?
NormAPI provides training in the form of documentation.
Q: How much does NormAPI cost?
Pricing for NormAPI starts at €49 per month.
