As a UX Design teacher, I have my students conduct a number of card sorting sessions. However, you cannot test whether users of your website or app can find a topic through your navigation. That is why you should always do a tree test in addition to card sorting sessions. UX Tweak's tree test tool is extremely useful. You simply build your navigation and then set up a number of questions. You forward the test to multiple test persons through email. Through the UX Tweak results page you can track exactly how your users understood your navigation. A fantastic tool and indispensable for every UX Designer.

We used UXtweak to test usability of our mobile app’s interface and it helped greatly. We were able to recruit a rather niche audience of participants directly in the app, which honestly saved a lot of time. The study had great analytics for each task of our test. There are also recordings for each session that you can come back to for further analysis.

Their card sorting feature. It’s a great tool that offers an insane amount of analytics and features for such a price.