Just picked this up tonight... Is the app still in active development?

Should be so — I purchased all the problem packs just a a few weeks ago.

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“The only difference between me and a madman is that I’m not mad.” — Salvador Dali ★ Play a slooooow correspondence game with me on OGS?

I'm still working on it !
I haven't had much time this year to make any major changes, but you can expect to see some new problem packs during the next months as well as a few other improvements.

I still use this app just about every day. I must say that the quality of the problems has improved a lot since the early days.

For me, there is one crucial feature that is missing: some way to bookmark problems - particularly those that come up in the daily problem rotation. So far, I have been taking screenshots of the more interesting of them but that is really sub-optimal because screenshots are not interactive and the solution is not stored in any way.

Problem # 4 in the Beginner Problems Pack seems to missing a solution. Currently, using an Iphone on IOS 10.2.

At least now, there is the option to bookmark in the menu with the three points.