ExcelDojo

The Excel formula lab where you learn by doing, not watching

Productivity

Spreadsheets

Education

Visit WebsiteSee on Product HuntGumroad ⧉

Hey Product Hunt, I am Danish, a personal trainer and entrepreneur based in Southeast Asia. Yes, a personal trainer who built an Excel tool. Let me explain. The problem I kept running into was not unique to me. I watched people in my network, clients, friends, colleagues, all of them saying the same thing. They knew they needed to get better at Excel. They watched a YouTube tutorial. They read through a PDF cheat sheet. And a week later they were back on Google searching the exact same formula again. The learning was not sticking because nothing was asking them to actually do anything. Watching someone else type a formula is not the same as typing it yourself and seeing it work. That gap between knowing and doing is where most Excel education lives and stays. So I built something different. ExcelDojo started as a simple idea. What if every formula came with a live spreadsheet you had to actually use? Not a screenshot of a spreadsheet. Not an embedded video. A real editable table with sample data already loaded, where you type the formula yourself and find out immediately if you got it right. The first version was rough. It covered about 10 formulas and had no real design. But every person I showed it to immediately started clicking around and typing things without being told to. That told me the core interaction was right. From there the scope grew. I added three difficulty levels, a game mode with XP and streak bonuses, a free-play lab for experimenting with your own data, a cheat sheet, and a shortcuts reference. The whole thing ended up as a single HTML file, 138 kilobytes, that works entirely offline in any browser without an account or install. The constraint of keeping it as one self-contained file turned out to be the best design decision I made. It forced every feature to earn its place. Nothing bloated, nothing unnecessary. What I am most proud of is not the feature count. It is that you can open this file, click on SUM, and within 30 seconds you are typing a formula into a live spreadsheet and getting feedback. That time to first real interaction was the metric I cared about most. ExcelDojo is available on Gumroad for 5.50 USD, a one-time purchase. No subscription, no upsells. If you try it, I would genuinely love to hear what you think. The Product Hunt community has a track record of feedback that actually improves products, and I am here all day to respond. Thank you for taking a look. Danish