I'm Jan Klosowski (aka klos). I build things and write about stuff.

Deltabadger

A (soon) open-source dollar-cost averaging bot for crypto exchanges. Likely the best on the market.

As a SaaS, it helped thousands of users invest over $72M into digital assets. Now, since MiCA officially killed the business, I'm releasing the source code and the bot will be free to use.

DCA Calculator

It was quite surprising to me that this super popular concept was never done properly, and the most popular results on the internet were sometimes not even working anymore. There you have it:

The only dollar-cost averaging calculator for stocks, crypto, and whole portfolios. It also allows you to test rebalanced DCA and compare results against other assets.

ETF Comparison

A rather self-explanatory project I built in one of the November weekends.

The unique feature is that it compares not only lump sum investments in ETFs and Mutual Funds, but also dollar-cost averaging—which is how most people invest. I occasionally write human-generated commentaries on the most searched pairs.

Chart Generator

Anybody who follows me on X or reads my Substack knows that I love charts. A few times someone asked me how I generate them. For a long time, I was manually crafting them in Figma. Not anymore.

This is really a tool I built for myself, but if you have feature requests, let me know (X is the best way these days).

Coming soon

I try to build something new every week.

Some other posts: