The problem+
The problem I kept seeing
Four countries. Different systems. The same silence.
I studied in four countries. The lecture halls were different. The problem was identical.
During my master’s, I studied and worked across Europe and beyond: different universities, different systems and different cultures. Yet in every lecture hall I noticed the same thing: a teacher presenting slides to students who were either quietly lost or quietly bored, with no real way to signal either.
The teacher could not know who understood and who did not. Students could not ask questions without the social risk of raising a hand in a packed amphitheatre. The classroom was a one-way broadcast, and it had been for decades.
The teacher talked. Students absorbed what they could. At the end, nobody really knew what had landed.
(1)Teachers knew the problem too. They had lost count of the times they asked “any questions?” and met silence, only to discover in the exam that half the class had missed a fundamental concept. By the time they found out something had not landed, it was three weeks too late.
Building the missing feedback loop
Keep the deck. Add a live window into the room.
After my master’s, I built the tool I wished had existed in every class I had attended.
I graduated in September 2025 and decided to build. The idea was simple: give the teacher a live window into the room while they present. Not a survey after the fact, but something immediate that does not interrupt the flow of the lesson.
Students needed a frictionless, anonymous way to say “I’m lost” or “I have a question” without the social risk that usually stops them. Teachers needed those signals while they could still act on them.
Diaposi plugs directly into what teachers already do. Drag in existing slides, share a code and the room is connected through live reactions, comprehension signals and questions. No student account or app is required.
I did not want to replace the lecture. I wanted to make it breathe.
(2)Product facts
From upload to a live session
Keep the deck you already use, share one code and begin.
Student accounts required
The audience joins from a browser without installing an app.
Browser based
Diaposi works across phones, tablets and laptops.
Source: Diaposi, by design
Why higher education came first
The cost of a missed concept is high, and often invisible.
Universities were the obvious starting point, but the problem goes much further.
Higher education is where the gap between what is taught and what is understood is both costly and difficult to see. A student who falls behind in week three may sit through the rest of the semester struggling. By the exam, it is too late. Diaposi gives teachers an earlier signal, slide by slide and session by session.
For institutions, the value is also operational. When a faculty can see which concepts are consistently misunderstood across many sessions, it can redesign the curriculum around evidence rather than assumption.
The same need exists beyond universities: in secondary schools, professional programmes, workshops and training departments. Anywhere people teach groups, they need to know whether the message is landing.
Every lecture can become a useful feedback loop, not merely another dataset.
(3)Why this is the right moment
Four shifts are changing what a live session needs to do.
Education is changing faster than many institutions. Live engagement is becoming part of the classroom’s basic infrastructure.
Attention is becoming the new attendance metric.
A meta-analysis of 225 studies found that students in traditional lectures were 1.5 times more likely to fail than students in active classes. Being in the room is not the same as being engaged; attention has to be earned throughout the session.
Teachers are burning out on guesswork.
Across the lecture halls I knew, teachers described the same frustration: they put enormous effort into preparing content and receive almost no signal about what worked. A session report closes that loop with evidence.
Students expect to participate, not only observe.
Students are used to real-time reaction everywhere else, then enter rooms where speaking means raising a hand in front of two hundred people. Anonymous questions, reactions and votes make participation feel natural again.
Institutions need evidence for their teaching models.
European quality standards place learning outcomes and student-centred learning at the centre of institutional evidence. Session-level engagement data makes active learning measurable rather than aspirational.
What changes in the room
When the signal is visible, teaching can respond.
A lecture stops being a monologue and starts behaving like a conversation.
When a teacher can see that most students have understood a slide, that three have raised their hands and that nine are asking the same question, the room changes. The teacher can adjust the pace, revisit a concept or call on a raised hand. Students can see that their input changed something.
That loop motivates both sides. Teachers have more confidence when they have a signal from the room. Students pay closer attention when their reactions are visible and meaningful. Diaposi does not only measure engagement; it helps create it.
A slow-down alert is not merely a teacher tool. It tells the whole room that the lesson can respond and that nobody needs to be quietly left behind. That can change the culture of a lecture.
The strongest classroom is not the quietest one. It is the one that can listen to itself.
(4)