How do you get honest feedback on your landing page?

Just post it on forums/communities. People here already know what to look for and it also removed that bias barrier since no one is trying to be good with you. Might have to be patient at first but people still look at interesting stuff.

The most honest thing I've seen is the five-second version: show the page to someone who fits the buyer for five seconds, hide it, and ask what it sells and who it's for. If their answer doesn't match your headline, that's your first fix, and nobody has to be rude to tell you. Friends fail this test just as clearly as strangers do, so it works even with the people who are too nice.

The most honest feedback I have found is the kind that cannot be polite: measurements. Opinions on a landing page are shaped by who is asking; a fact like "your link preview is empty" or "your checkout event fires before the login wall" is not.

My numbers from reading about 60 indie pages this month: when I sent an opinion ("the headline is vague"), almost nobody changed anything. When I sent one fact the owner could verify in ten seconds, seven founders fixed it within a day. The one change that made the biggest difference was usually the headline naming the category instead of the brand, because every other fix only matters once a visitor knows what the thing is.

So my answer to "how do I get honest feedback": ask strangers to check one specific, binary thing ("can you tell what this does from the first screen?") instead of "thoughts?". Binary questions get honest answers.