Compare InvoiceXML vs. NormAPI

InvoiceXML serves as an API-centric platform tailored for achieving e-invoice compliance across Europe. Its REST API is capable of generating, validating, and converting a wide array of formats that fall under EN 16931, including Factur-X, ZUGFeRD, XRechnung, UBL, and CII. The generation process takes in clean JSON data and produces either a compliant XML document or a PDF/A-3 hybrid invoice, complete with embedded XML following specific formatting guidelines. Validation is conducted using the official Schematron rulesets, which not only deliver structured results but also provide accessible explanations in plain language alongside the raw outputs of the rules. For format conversion, the API endpoint (POST /v1/convert/{from}/to/{format}) allows the transformation of any supported format into another via a unified internal representation. Additionally, a dedicated namespace, /v1/transform/, facilitates AI-driven extraction from older PDF invoices into organized XML. Moreover, No-Code integrations enable users without programming skills to access core functionalities seamlessly. The MCP server supplies a robust compliance toolkit designed for AI-assisted workflows, ensuring that the platform is consistently aligned with the latest standards, requiring no ongoing maintenance for users. This approach not only simplifies the compliance process but also enhances efficiency for businesses navigating the e-invoicing landscape.

NormAPI serves as an e-invoicing solution tailored for software developers, enabling the issuance and verification of German e-invoices formatted as XRechnung and ZUGFeRD. It comprises two main functionalities: validation and generation. The validation endpoint scrutinizes invoices (in UBL, CII, or ZUGFeRD PDF formats) according to the official KoSIT guidelines, returning detailed findings in JSON format, which include the rule code, severity, and the specific location within the document where the issue arises. The generation feature transforms invoice data provided in JSON into a validated XRechnung (in UBL or CII format) or a ZUGFeRD PDF. Regular updates to the rule set, published by KoSIT approximately every six months, are incorporated, and the active version is included in each validation result. Additionally, a TypeScript client can be found on npm for easy integration. The same validation process is available through a complimentary browser tool that does not require user registration and ensures that invoice content is not stored, while also providing plain-language explanations for 137 out of the 307 rules, assisting users in understanding and rectifying their invoices. Validation services are offered free of charge, while invoice generation is priced at EUR 49 per month for up to 500 invoices or EUR 149 for up to 2,500 invoices, with each account also benefiting from 25 complimentary generated invoices per month. This comprehensive approach ensures that software teams can efficiently manage their e-invoicing needs while staying compliant with the latest regulations.