Building FoxCheck.cz: The Story of a Platform Returning Fairness to Online Testing

It has become an everyday reality. But alongside the arrival of laptops, tablets, and exceptionally smart AI tools in classrooms, an entirely new question emerged: How can we conduct online testing in a fair and meaningful way? How can teachers ensure that an essay or test answer was genuinely written by the student and not generated in seconds by an AI chatbot?

At Foxmate.cz, we specialize in custom software development, systems optimization, and building digital tools that streamline operations. When we explored the most pressing challenges in education, we recognized an opportunity to build a truly impactful solution.

Teachers spend their evenings preparing materials, only to receive answers generated instantly by AI. Traditional online testing tools fail in this environment. That is why we combined our software engineering expertise with classroom realities to build FoxCheck.cz—an online testing platform designed to restore fairness and integrity.

The Core Problem: Why Classical Tests Fail in the AI Era

To build an application that genuinely helps, we had to rethink the testing experience. Most legacy school testing systems were built when the biggest concern was looking up answers on a smartphone. With AI assistants integrated directly into browsers, testing often turned into who could query an AI window fastest. For teachers, detecting AI assistance reliably is nearly impossible with standard tools.

From a developer perspective, we identified three critical flaws in typical web testing systems:

Window Switching: Students can easily browse the web or chat with peers during the test.

Unlimited Copy-Pasting: Copying question text, sending it to AI, and pasting the answer takes seconds.

Zero Context Awareness: Systems have no visibility into what occurs on screen outside of button clicks.

Our goal was solving this entirely within standard web browsers without requiring complex desktop software installations. We leveraged modern browser APIs that securely monitor tab activity and interaction events during tests.

What FoxCheck Delivers: Features That Simplify Teaching

FoxCheck.cz is built to save teachers time and provide smooth test management:

Focused Environment

When the test starts, the application enters secure mode. It logs any tab switching, application minimizing, or window changes to a timeline, allowing teachers to review student activity seamlessly.

Preventing Copy-Pasting

Copy-paste shortcuts are disabled, ensuring students formulate answers in their own words.

Question & Answer Randomization

Questions and multiple-choice options are shuffled uniquely for each student, preventing side-by-side copying.

Designed for Real Classrooms

Software must be simple and enjoyable to use. For teachers, class management and grade exports work with a single click. For students, no complex registrations are needed—they simply enter a code or link and start immediately on any device.

Tested and Proven in Real Schools

0% Data Loss: Real-time background saving every 5 seconds ensures no student answers are lost, even during Wi-Fi drops.

Time Saved: Teachers report saving an average of 45% of grading time thanks to automated scoring and clean interfaces.

Looking Ahead

We continue expanding FoxCheck with behavioral analysis, AI-assisted question generation for teachers, and direct school LMS integrations. Modern education can maintain fairness in the digital age with the right tools.