There's difference in 'Online SPICE simulator' and 'Online SPICE simulations'. I can happily say that, I was able to achieve the latter, through my online videos on Circuit design. Let me think, and get back on how do I do the 'former'.
Don't you think, it would be great, that while you learn basics on Circuit Design & SPICE simulations, parallely, you should even be able to simulate it 'Online', without needing to download any simulator on your PC?. That's the 'VISION' I have, and let's see, if I will be able to achieve it.
For now, the first step towards this vision, has been achieved. Look for yourself in the below demo video, how am I doing this