[honzzz]

It would be nice to indicate in a title that the link is only useful for people with specific platform. It's kind of disappointing to go there and find out I cannot try it because I don't have that kind of device. Something like "Show HN: Sketchology [iOS]" or "The thing [Android]" or something like that could be helpful.

[chrisdevereux]

Not useful doesn't imply not interesting.

Having the 'Show HN' posts all tagged with platforms would sorta make me feel like I'm in a supermarket, skipping past the isles containing stuff I'm not going to walk out with.

[honzzz]

Why all? My estimate is that most of them are web apps, mobile apps are often at least Android/iOS, I would say that those tags I proposed would be needed quite rarely. And it's not like I am demanding it, it was just a proposal to see whether others would like or not - just my $0.02 - you certainly raise a valid point, we certainly do not want to complicate things too much.

[bobwaycott]

HN doesn't need to take on responsibility for managing your disappointment level.

The link is useful for anyone who wants to check out the link, see someone's work, and provide feedback.

The linked-to product/app/service is usable by anyone who is interested enough and has the requisite platform or device(s).

Your devices do not determine the usefulness of someone else's work.

[asadlionpk]

The app encourages me to buy the device this app is intended for. So it was useful for me that he didn't mention the platform in the subject and scare me away.