I'm currently developing a free tool to generate more traffic for my workflow collaboration tool Twoodo. This free tool is called "Your Open Shareable Todo List" and is a todo list that requires no sign-up or installation. I've read that conversion rates on "Powered by" are around 0,01% or 0,1% (can't remember). Has anyone tested and found a CTA that works better? Any suggestions on some CTAs to A/B test?