The app is nice for playing with small circuits, its interactive and you can tweak values to see what effect they have on the circuit. I would gladly give the developer $5-10, but after 2 days the work area becomes unusably small and constantly nags you to subscribe for $10/yr. to save your files and access the "community library" which is largely junk content, not professionally designed, tested and documented circuits. Im deleting it, but hope the developer comes up with a better pricing scheme.
Richfiddler11 about EveryCircuit