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Reads fine on my tiny old smartphone. It seems responsive (as in responsive design). Also, looks fine in reader mode.

What problems did you have with it?

I’m on an iPhone 12 mini and half the page is horizontal scrolling and it jitters as I scroll down the page.

Looks like it may just be you. No issues on a cheap $300 no name Android device. Renders and scrolls fine.

Test it with a feature-complete browser and see how it compares to Safari, then.

I also tested on iPhone 12 Mini and RealMe R3.

I got the same problem as them

Also, the contrast is not great and the letters are really thin. I'm not a fan of Medium but the text on it is usually readable without effort.

That's only true if you're selling your platform as an alternative.