I also wrote a minimal version for me, https://mostlymaths.net/nb/ https://mostlymaths.net/nb/ Only works well on mobile portrait though, I designed it especif

I also wrote a minimal version for me, https://mostlymaths.net/nb/ https://mostlymaths.net/nb/ Only works well on mobile portrait though, I designed it especifically for my phone. Don't use it much though.