The best alternatives to Nano Notes Pro are Kenobi, Jotbox, and Captio. If these 3 options don't work for you, we've listed a few more alternatives below.
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Hurree— The smarter, simpler way to analyze your data
Kenobi is A watchOS app which elevates your macOS experience. Whether you want to use it as a presentation remote to change slides, or quickly pause a movie you're watching without getting up from your bed. And there are tons of more features.
This is a very simple, powerful and easy to use notes application. The application uses iCloud for the data synchronisation between your iPhone, iPad, Mac and Watch.