Review on Apple-Compatible Active Stylus Pencil, Touch Screen Stylus Pens for Kids, Students - Capacitive Drawing & Writing, High Sensitivity - Tablet & Smartphone Stylus (Red) by Robert Ducki

I love it, works well, no lag and great for my baby to keep track of letters and numbers in educational apps. I also tested it with document signatures and it works very well. Highly recommended, although it doesn't have palm rejection, just raise your hand above the screen to do what is required, not expensive :)