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Yeah, LCWO is the gold standard for Koch training on the web, and I'd second the suggestion for CW Academy. Having a commitment to learning with other people tends to help you ride out the rough patches.

To help with my own learning, I built a mobile friendly web app/game which includes Koch as an option. It's also open source - https://github.com/mdp/morse.mdp.im - morse.mdp.im

On iOS there is Morse Machine, similar idea for single characters. There is also morse.camp, a PWA that focuses on recognizing English words.

On iOS, I like the Ham Morse app. It does Koch and Farnsworth, simulates QSOs, and sends news summaries.

Interesting! I found myself struggling a lot on the linked site because the random groupings made it very easy for me to lose my place and feel like i've gotten behind, but LCWO's fixed groups of 5 help my find my place a lot better.