+1
For Prepared spells (Cleric, Wizard, etc.), the good old spellbook style UI, with empty slots you fill and, below it, you mention how many spells of that level can be cast per day.
Much easier though for Spontaneous casters.
For casting a spell with a higher spell slot, you could have a special icon like "Use a level 2 spell slot" and then you select the level 1 spell you wish to cast boosted. Otherwise, I would not mind if you have to just cast spells at their original level.
Last edited by Baraz; 09/10/20 03:34 PM.