KSeF - to proste!

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Everyone
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About this app

An educational application for learning about the National e-Invoice System (KSeF) in Poland. A comprehensive tool preparing students for working with the KSeF system in accordance with Ministry of Finance documentation.

APPLICATION FEATURES:

Interactive Quizzes
Over 70 test questions testing knowledge of the KSeF. Questions are based on official Ministry of Finance documents. Scoring system and explanations for each answer.

Word Puzzles
Interactive tasks for completing definitions from KSeF textbooks. Over 30 puzzles with key terms and definitions of the system.

Certification Exam Simulation (Premium)
A full 60-question test assessing readiness for working with the KSeF. Time: 60 minutes. Required score: 80% (48/60 points). After passing the exam, you can generate a personalized PDF certificate.

Knowledge Topics
Comprehensive lessons on KSeF, including:
- Structure of a Structured Invoice (FA(2))
- KSeF Implementation Schedule
- Invoicing Rules
- Integration with Accounting Systems
- Certificates and Authentication

XML Invoice Simulation
A tool for creating sample invoices in XML format compliant with the FA(2) structure. Document structure visualization.

Calculator and Converter
Supporting tools for calculating and converting invoicing data.

LOGIN AND SYNCHRONIZATION:

Logging in with Google ensures progress is synchronized across devices. All data is securely stored in the Firebase cloud.

PREMIUM FEATURES:

Unlimited access to all quizzes and puzzles. A certification exam simulation. Generate a personalized PDF certificate. No ads.

FOR WHOM:

The application is intended for:

- Accountants and invoicing specialists
- Programmers integrating systems with the National e-Invoice System
- Students and individuals preparing for exams
- Companies implementing the National e-Invoice System
- Anyone interested in learning about the National e-Invoicing System

KNOWLEDGE SOURCES - OFFICIAL LINKS TO OFFICIAL INFORMATION:

All information in the application is based on official documents from the Ministry of Finance. Below are direct links to the original official sources:

• KSeF home page: https://ksef.podatki.gov.pl/
• KSeF 2.0 API documentation: https://www.gov.pl/web/finanse/publikacja-dokumentacji-api-ksef-20-oraz-struktury-logicznej-fa3
• Implementing regulations: https://www.gov.pl/web/finanse/rozporzadzenia-wykonawcze-do-krajowego-systemu-e-faktur
• KSeF FAQ: https://ksef-gov.pl/

IMPORTANT DISCLAIMER:

The "KSeF - It's Simple!" application does NOT represent a state institution or the Ministry of Finance. It is an independent educational project. The application is for educational purposes only and does not constitute legal or tax advice.
KSeF education: quizzes, certification exam, XML invoices, certificate.
Updated on
Feb 1, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Personal info, App activity and 2 others
  • This app may collect these data types
    Location, Personal info and 3 others
  • Data is encrypted in transit
  • You can request that data be deleted

What’s new

• Symulacja KSeF krok po kroku – logowanie, wystawianie i odbieranie faktury
• Formularz faktury z podglądem XML i symulacją wysyłki do KSeF
• Quizy, tematy wiedzy, kalkulator terminów i konwertery (NIP, daty, limity)
• Egzamin certyfikacyjny i Premium – wkrótce
• Poprawki stabilności i wyświetlania
Content rating
Everyone
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App support

About the developer
Radosław Kowalczyk
radekkowalczyk245@gmail.com
Zamoście 8 32-830 Wojnicz Poland