RedPen
Smart exam solutions to help students prepare. Study buddy.
RedPen launched on January 17, 2026 with 2 votes, #7,141 of 16,395 launches that month.
What it does
RedPen provides high-quality solutions to exams and exercises. It captures entire exams of up to 20 pages, identifies the main exercises, and produces detailed, step-by-step explanations tailored to the user’s level. The feature we are most proud of is exam cloning: by generating new exams tailored to a user’s specifications based on previously solved exams, we help students prepare with an infinite number of practice exercises.
Does a similar job
all alternatives →
- TMTubePen – My attempt to get more out of YouTube learning2025 · tubepen.com · ▲74
Hi HN! I made this because I always forget what I'm trying to learn from YouTube. Test yourself: Can you remember the main concepts from the last (educational) video you watched? So, why not highlight and take notes on YouTube videos, just like in books? That's TubePen. Sign in, replace "youtube" with "tubepen" in your YouTube URL, and you're ready to retain more from your videos. I’d love your feedback! What do you think of my landing page? Use the 10-day free trial and see if it’s useful for you. Thanks!
More work this month
the category →
Clipto MCP▲640Hey HN, We recently built Clipto. It’s a tool that lets you search over terabytes of video, audio, and images on your computer, without relying on the cloud. Motivation: we probably all had this similar experience, we know a moment exists in a video or audio, but finding it takes hours scrubbing the timeline. You can send all the media to process in the cloud, but it’s slow, expensive and raises privacy concerns. So we decided to build our own on-device media search engine. How it works (high level): 1. We ingest video, audio, image; normalize formats via ffmpeg; run content analysis to…
Work · 23d ago · clipto.com
Hey we are Computable. We spent years building trading infrastructure at Jump Trading and Coinbase. From that point of view, compute looks like energy markets before 2000: everything trades through private bilateral leases, there’s no visible price, and nothing can be resold. The same H100 rents at a 2x spread depending on who’s asking, and once you sign a 24-month lease, it can never change hands. So we built a market for GPU nodes, sold by the calendar week. Here are three things you can do on it that you can’t do anywhere else: - Buy exactly the weeks you need. Three nodes for the last…
Work · 15d ago · getcomputable.com
The New Calendly▲211Handle all of the work before, during, and after meetings
Work · 22d ago · calendly.com
Source: Product Hunt launch ↗
Launched alongside, January 2026
the whole month →- IN
Hey HN! I wanted to share something I built over the last few weeks: isometric.nyc is a massive isometric pixel art map of NYC, built with nano banana and coding agents. I didn't write a single line of code. Of course no-code doesn't mean no-engineering. This project took a lot more manual labor than I'd hoped! I wrote a deep dive on the workflow and some thoughts about the future of AI coding and creativity: http://cannoneyed.com/projects/isometric-nyc
AI · Jan 2026 · cannoneyed.com
Automatic AI-powered code reviews the moment you open a PR
Dev tools · Jan 2026 · kilo.ai
