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I really like this one. I'm going to put it in my wish list.

One great bit of UI on that web site: When you hover over the "Buy" button, it shows you the price. Too many web sites hide the price of software.

Very often I want to know how much something costs before I look at its features, so as I'm learning what it does I can better understand if it's a good value.

See also the web based https://devdocs.io

Zeal on Linux (https://zealdocs.org) provides the same functionality and is really polished as well.

free alternative for Windows: https://www.documentalist.io/

It used to work great on iOS until Apple crippled it.

What doesn’t work on iOS? I use it all the time.