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Red Marker
Get your evenings back from checking maths homework
Worksheet marking doesn't scale. RedMarker fixes that. Point your phone at a pile of maths worksheets to quickly get marked results. Built for ages 4–10, designed for the people doing the actual marking — parents, tutors, and teachers. Smart Scan moves you through multi-page booklets swiftly. Progress views show accuracy over time so you know exactly where to focus next. Less red pen. More teaching. Free tier refreshes monthly. Buy credits if you need more — no subscription.
Last Christmas, I had a surplus of unspent annual leave. With no agenda and a restless urge to keep busy, I decided to tinker with Optical Character Recognition; OCR software has become central to a project at work. I wanted to better understand its capabilities and limitations, especially because AI is advancing at breakneck speed.
Every evening after dinner, the same scene played out at the dining table. Usually it was my wife who would sit down with a red marker pen and a stack of maths-drill worksheets, freshly completed by our two children. Page after page, answer after answer. Forty-five minutes of tedious checking that neither of us would ever get back.
One evening, on a whim, I snapped a screenshot of a worksheet using my phone and fed it to an AI model to see if it could accurately spot the wrong answers; it could. I had a lightbulb moment and what started out as an experiment quickly became an obsession. By the time I returned to work in January 2026, I had built a useful minimum viable product called RedMarker.
RedMarker is an app that uses your phone's camera to accurately validate maths-drill worksheets in minutes instead of 45. The real win? We now spend the reclaimed time actually helping our children understand their mistakes, not just hunting for wrong answers.
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About Red Marker on Product Hunt
“Get your evenings back from checking maths homework”
Red Marker was submitted on Product Hunt and earned 1 upvotes and 1 comments, placing #137 on the daily leaderboard. Worksheet marking doesn't scale. RedMarker fixes that. Point your phone at a pile of maths worksheets to quickly get marked results. Built for ages 4–10, designed for the people doing the actual marking — parents, tutors, and teachers. Smart Scan moves you through multi-page booklets swiftly. Progress views show accuracy over time so you know exactly where to focus next. Less red pen. More teaching. Free tier refreshes monthly. Buy credits if you need more — no subscription.
Red Marker was featured in Android (57.1k followers), Productivity (649.9k followers), Parenting (4.3k followers) and Education (78.4k followers) on Product Hunt. Together, these topics include over 194.3k products, making this a competitive space to launch in.
Who hunted Red Marker?
Red Marker was hunted by Gary Smith. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Gary Smith