@allnick @perborgen Thanks! I'm glad you like it. It was my co-founder Sindre who got the idea when he was trying to create screencasts for his programming language Imba (imba.io). He became increasingly frustrated with the cumbersome process of recording, editing, swearing, uploading, encoding, re-encoding etc. So he started building Scrimba. Since we're recording events instead of dead pixels, our format is much more light weight (1% of video). This also opens up for interactivity for the viewer; simply pause the screencast and edit the code :)