Dev tools · September 30, 2017
piCards- Computer vision based audience polling solution for classrooms
We have created a computer vision and smartphone based audience polling solution that promises all the benefits of clicker devices at minimal cost and that too without the students requiring any electronic devices. Use of continuous feedback systems like clicker devices is proven to improve learning outcomes in classrooms and such devices are widely used in Universities. BUT such devices are costly and hence cannot be used in mid-low income setups. Also, carrying devices in bulk is a problem. In our solution, we replace the clicker devices with normal sheets of paper with QR Code like…
piCards- Computer vision based audience polling solution for classrooms launched on September 30, 2017 with 52 votes, #766 of 3,073 launches that month and more than 90% of that year's launches.
In plain words
piCards is a computer vision-based classroom polling system that replaces expensive clicker devices with printed sheets of paper marked with QR-code-like patterns. Students show their sheets to the teacher's smartphone app, rotating them to indicate answers A, B, C, or D. Designed for educators in resource-limited settings, it provides real-time student feedback without requiring students to own electronic devices, making continuous classroom assessment affordable and practical.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
We have created a computer vision and smartphone based audience polling solution that promises all the benefits of clicker devices at minimal cost and that too without the students requiring any electronic devices. Use of continuous feedback systems like clicker devices is proven to improve learning outcomes in…
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