
CyberChef
IT Tools
CodeSwissKnife
10015.io
JSONFormatter.org
JSONLint
A.Tools
A collection of converters, formaters, encoders, generators and other tools for your Windows desktop.

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, DevToys seems to be more popular. It has been mentioned 16 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | devtoys.app | normapi.com |
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In their own words, as submitted to SaaSHub.


No description of DevToys 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
An editorial look at what each product does well and who it suits.


Overall verdict
Why this product is good
Recommended for
No analysis of NormAPI yet.
Walkthroughs and reviews on video.
DevToys - Review and How to Install | The Swiss Army Knife for Developers
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using DevToys and NormAPI. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


There are lots of these, but this is the first that I've seen that focused on frontend dev a bit more. I've saved it to my list of tools for reference. Here's another with a more local / backend / IT flavor: https://it-tools.tech I have... - Source: Hacker News / 10 months ago
Think of DevToys as the developer equivalent of a multi-tool. It’s a desktop app with dozens of handy utilities. - Source: dev.to / about 1 year ago
Devtoys is great and open-source and .NET and cross-platform * https://devtoys.app/ and in context to the thread files-community/files is great and open-source and .NET and cross-platform * https://files.community/. - Source: Hacker News / almost 2 years ago
Tracking NormAPI since Oct 2026.
When comparing DevToys and NormAPI, you can also consider the following products.


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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IT Tools is a free and open-source collection of handy online tools for developers & people working in IT.
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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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Feature-packed developer toolkit. Includes text conversion, encoding, UUID generation, cryptography, color conversion, JSON/XML formatting, and more for simplified, efficient development tasks without online data transmission.
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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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