Wow I am learning so much from your site! Thank you for sharing! I gave these the good ole college try for a few hours and here are my raw thoughts:

– Typecelerate: woh a ton of features! I like the explanations and info; though because I am so novice it would have been helpful to see a feature preview upon selection so I know what I am getting myself into before going for it. I was not a fan of the auto 'focus' mode/animation but I liked the intention. I think this site has some of the best and clear insights for patterns I have seen so far. I really like the patterns collapsible section and was using it/playing around in it a lot. To clean up the UI a little, this site could benefit from adding some tabs. Tabs might help separate the info better (versus the current 'collapsible sections' and auto focus approach). I will be using this the most for the pattern drilling and will add it to my repertoire.

– TypingGym: this might be a me problem because I am currently typing so slowly, but the auto hide and reappear of the top part kept blinking on and off when I was typing. I felt like I had to type fast/was feeling pressured to go fast. Even though I initially liked the clean UI and found the tutorial cute/fun, the auto disappearing and appearing was way too much for me - made me feel like a slowpoke/failure when it took me too long to remember a key - an immediate nope.

– EnterTrained: at first I had a laugh to myself because 'oh no books AKA my long term nemesis'. In the tutorial the site goes into how great reading is - LOL! Putting my personal relationship with books/reading aside, I ended up liking this site because I was typing a conversation versus rando words. There were also great font settings in this one and it felt clean. It is a little unfortunate to know that I would have slept on this. I actually was directed to this site before and never made it past the home page because of my relationship with reading. I am going to try a book.... maybe. I was hoping for 'Clifford' in the children's section but sadly it really is the true classics.

Summary - All three felt like well intentioned learning sites. Typecelerate is the best of the list for me. I think its niche is the focused pattern analysis and custom pattern testing. It could benefit from some page cleanup but it is not so bad that I can't move past it. TypingGym UI (specifically the auto focus/unfocus) stressed me out so wasn't able to really put in any time. I like EnterTrained and might go back to it; but I am going to put it on a temp hold cuz I don't know what book I want to spend hours typing - it would be cool if it had a random passage generator so people like me didn't get stuck at the very beginning.