Fast documentation search works brilliantly and I especially like the offline capabilities.
The Dash iOS app is a great addition -- try it on an iPad with the Duet second screen app.
Best of all, the author is responsible and responsive. Well worth buying.
Better (for me) is setting the iOS app up as a remote for the macOS app. In Emacs, I can hit `C-c d to` and the iOS app will open the docs for the function my cursor is currently over. I can use my iPad as little docs-only viewer under my monitor.
Most importantly, the saga of Dash being banned from the App Store, and the author's blatant attempt to use the community as his private army in an attempt to blackmail Apple, have completely ruined his reputation and any goodwill he may have had at some point,
Why would that "ruin his reputation"? Seems like a very OK and logical act: get your users to add their voice against the mistreatment of their app by some store's policies.
ADDENDUM: Hmm, reading into the story, the actual issue is false promoting his apps with fake reviews, not that he tried to use the community to help his case with Apple. The problem is that his case was problematic in itself.
[EDIT: not related to Karelia software -- mixed-up Kapeli and Karelia]
I guess you didn't read the the drama from the last time this app was featured on HN.
I'm confused: Duet is an app for viewing a macOS desktop on the iPad. How would you use it with the Dash iOS app?
When Duet is off, the iPad is typical and can show iOS Dash, which can handle inbound searches such as from a laptop.