Thanks, wooclap looks really good and possibly more simple. Will check it out in more detail!<p>The QR code leads to the web-response (e.g. it encodes the URL g.2sli.de) I found some audience members had trouble with the short domain, they would write things like g.2sli.de.com or g.www.2Sli.de - the QR code made it easier for some to respond! Taking a picture of the QR code with the default android camera offers an option to open the link.