Perhaps someone could comment on simulation software, particularly on the simple/beginner side of things? For instance, recently I got some supercapacitors and

Perhaps someone could comment on simulation software, particularly on the simple/beginner side of things? For instance, recently I got some supercapacitors and had a few ideas for a simple circuit (consisting of resistors, diodes and capacitors). I did an EE unit when I was at school a long time ago but wanted to get a better understanding of how my circuit would behave, particularly voltage levels and discharge rates over time. I was expecting there would be some software which would allow me to draw a simple circuit, specify input voltages and press 'play', allowing me to see how the circuit acted as a live simulation and see charts of voltage at particular nodes over time. However, despite googling around, I couldnt find such software geared towards visualisation of simple analog circuits... Happy to look at OSS or propriety software, I was expecting to find something used in academia but no such luck. Any recommendations?