No posts in this community for a few years so I figured I'd kick one off :P
App 1: trytalker.com - Free, doesn't work on Firefox, AI isn't good at continuing conversation.
App 2: speakpal.ai - Seemed pretty good at conversating, but I got an expensive pricing popup (20$/mo) after only a few minutes of use. It seemed quite nice though.
App 3: Duolingo - Honestly garbage, it's an app with a focus on getting you to open it every day and pay rather than one that helps you learn. Great if you like keeping a streak for motivation.
App 4: talkpal.ai - Has free plan for 10 minutes a day. I didn't find the AI as engaging as speakpal, and the plans require a huge commitment (24 months) before they become a good deal
The rest were all mobile only, and I wanna 'learn' Korean while I play on the computer so I didn't try them out. I think I'll go back to Speakpal, it seemed the best.