The second thing climbing got me building. DuoTimer is a minimalist interval timer for hangboard and fingerboard training: set a work phase and a rest phase, time them independently, and run your protocol without touching your phone again until it’s done.

Like Griplog, this is where I properly learned iOS development, again with Claude Code doing a lot of the heavy lifting.

DuoTimer is heading into private beta soon. More on griplog.app/duotimer once it’s out.