I have some previous experience with NeuronWriter which used to be on sale at AppSumo before. After buying and trying ContentPace I can say both tools are doing their job nicely, but I prefer the UX of ContentPace even though it probably needs a little bit more time and work to mature, get rid of some minor glitches and improving the UX even more. David from LearnWire just published a comparison of both tools on YouTube (https://youtu.be/vwgUbli5Tgo) which I fully agree with.

Since there's no LTD for NeuronWriter anymore, the decision is obvious: if you need a content optimization tool you can't go wrong with ContentPace. Thanks for the effort you put into your product, Muntasir!