
euinvoice.app
EuroCompta.eu
eVATCalculator.com
VATCalculator.biz
Calculate exact standard & reduced VAT rates for all 27 EU member states plus the UK and Switzerland. Generate compliant PDF invoices for freelancers and cross-border B2B business instantly, entirely in your browser.

The modern platform for creating, sharing, and collaborating on AI prompts. Advanced version control and real-time testing.
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The Ultimate Prompt Tool for Creators – Visualize & Organize with Diffyn
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As answered by people managing EuTaxFlow and Diffyn.
Diffyn's answer:
Addresses workflow and change management on LLM prompts, provide teams with traceability and visualization of tests across multiple models, provide deeper understading into efficiency of these prompts.
Diffyn's answer:
Diffyn is the platform that specializes on both change management and multi-model analysis.
Diffyn's answer:
React, Next.js, POSTGRESQL
Diffyn's answer:
Professionals incorporating LLMs or AI tools in their workflow and wants to keep track of changes and test their prompts.
Diffyn's answer:
I started working on Diffyn when I notice that prompting has become an essential part of work across many industries. While there are version control platofrms like github, they are not designed for just prompt management are can be overkill such applications, it is also not integrated natively with various LLMs and relevant tools for users to validate ideas and visualise results properly.
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When comparing EuTaxFlow and Diffyn, you can also consider the following products.

Create compliant EU invoices in seconds - VAT, reverse charge, VAT-exempt - for 7 countries. Free, no account needed.
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Free country-specific accounting tools for European professionals. VAT calculators, payroll, depreciation, invoicing and more for France, Germany, Spain, Portugal, Belgium and the Netherlands.
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E-VAT Calculator is a universal VAT calculation tool designed to calculate Value Added Tax for EU and non EU countries.
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Free UK VAT calculator for 2026/27. Add or remove VAT at 20%, 5%, or 0%. Reverse calculate, understand rates, registration thresholds, flat rate scheme, and common mistakes.
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