I turned Stripe dopamine into an MRR heatmap

MRR Calendar started from a very simple feeling.

One weekend, after I made my first real sales on Comidoc.com, I became almost addicted to opening Stripe. The dashboard felt exciting, and the Apple Watch payment notifications were even worse: every sale created a tiny dopamine hit.

But something was missing.

Stripe was great at showing transactions, revenue, customers and subscriptions, but it did not help me feel the continuity of the business. As a solo founder, what I really needed was a simple visual answer to one question: “Did the business move today?”

I already had that feeling with GitHub. The contribution heatmap gives you a daily visual proof that you are showing up. One square per day. Green when you ship. Empty when you don’t.

So I wanted the same thing, but for revenue.

That was the original idea behind MRR Calendar: a daily revenue map, inspired by the GitHub heatmap, but focused on SaaS income. Instead of commits, it shows money. Instead of vague monthly charts, it gives you a very concrete view of your revenue rhythm.

At first, it was just a personal tool. I wanted to see whether my SaaS was alive every day. But the more I worked on it, the more I realized that indie hackers and solopreneurs need more than a Stripe dashboard. They need a simple cockpit to understand what is happening across their products.

So the product expanded: Stripe integration, revenue calendar, MRR tracking, multi-currency support, better search, cleaner historical data, and a more founder-friendly way to visualize progress.

The main lesson is that a good product does not always start with a huge market analysis. Sometimes it starts with a very specific frustration you feel yourself. In my case, it was not “I need another analytics dashboard.” It was: “I need to emotionally understand my revenue the same way GitHub helps me understand my shipping consistency.”

What worked was building from a real founder emotion. Revenue is not just a number when you are bootstrapping. It is motivation, stress, validation and pressure, all mixed together.

What failed at first was underestimating how complicated revenue data can become. Payments, refunds, currencies, subscriptions, historical exchange rates, failed payments — everything looks simple until you try to turn it into a clean daily view.

If I had to do it again, I would probably start even narrower: one integration, one clear use case, one perfect visualization. But I’m glad the product started from a personal itch, because that is what kept me building.

MRR Calendar is still evolving, but the core idea remains the same: help founders see their revenue journey one day at a time.