Startup 3 is not free to use.
We’ve got a demo version of Startup product.
In demo version you able to use all functions of Startup 3 – change fonts, colors, set animations, preview your project and export your template. The only restriction of demo version is number of available blocks – you able to use only 2 first blocks from each category.
You can try demo in Generator app: https://designmodo.com/startup/app/