All the other iOS apps I’ve tried are laughably crippled. One of the apps I tried (Pinswift) still opens all links in an embedded web view, which means I couldn’t easily log into any sites because I’d have to copy and paste the credentials and OTP manually (NYTimes, WaPost, GitHub, etc). This also means no ad blocking or other protections and functionality offered by the SafariViewController feature in iOS.
I’d also expect for $9.99 plus a $1.99 for “Premium Fonts” Pushpin for Pinboard to be excellent but it isn’t. It’s unstable and its share extension isn’t as flexible as Pinner’s.
That said, Pinboard is a good service. It cares about my privacy, which is very important to me, and has the features I need for a bookmarking service. It is not a read-later service. For example, the article caching features that it provides is web-only and isn’t available through the API so no third-party app can integrate it. This means there is no truly offline reading experience since I’d have to have access to the Pinboard website if I want to read a cached link.
EDIT: Windows would be the main win for me if a good client exists, as that's my main OS. I only use Ubuntu at work.
I’ll have to start looking for this, soon, however. I’m seriously considering switching. Another service that seems to have no native clients on Windows or Linux is Feedbin.
It used to be that one could find tons of native apps for Windows for pretty much anything. Now there’re hardly any for popular services. I’m not sure if this is because of Microsoft’s seemingly schizophrenia approach to their office APIs (is it MFC? Win32? WinForms? XAML? UWP? Something else?) and their lack of focus or just the iPhone and mobile computing’s “halo” effect.