Excel Formula Exercises
Duolingo for Excel formulas — daily streaks, real skills.
What it does
Stuck on a formula that returns #N/A, or can't remember VLOOKUP from INDEX/MATCH? Type it into a real spreadsheet grid and find out exactly which cell is wrong — and why, not just that it is. 90 exercises across 11 tracks, from basics to FILTER/SORT/UNIQUE/LET. A daily challenge keeps your streak alive, and a global leaderboard lets you compete with other learners. No videos, no fluff — just Duolingo-style bite-sized practice for students, analysts, and anyone who wants real Excel fluency.
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Launched alongside, August 2026
the whole month →- TL
Life & fun · 10d ago · louisabraham.github.io
- SA
Hello HN! I found that picking out plausible but diverse skin tones for my digital art and game development projects was kind of difficult, and I got curious about if there was a way to define a color space that made it easy. I've built a color picker and procedural generation algorithm based on the space as well as a bunch of other fun js features and demos throughout the page that use the equations. If you find it interesting, I have lots of explanations of how I built it and what properties the space has. The methodology might be a bit shaky, but hopefully the result is as helpful for…
Life & fun · Aug 2026 · toneyalexander.github.io
I trained a 125M-parameter transformer to autocomplete piano performances in real time (~108 notes/sec on an iPhone 15). The idea is basically GitHub Copilot or Tabnine, except instead of prompting it with code, you prompt it by playing a few notes on a MIDI piano. The model then continues what you played, entirely on-device. The app is free if anyone wants to try it. Happy to answer questions about the model, training, Core ML, or the many things that didn't work.
AI · 16d ago · simedw.com