The best alternatives to Gratia are Avrio, Fermat's Library, and Faculty of 1000. If these 3 options don't work for you, we've listed a few more alternatives below.
A collaborative mixed methods User Research platform. Taking an unconventional approach with a browser extension and web app you can capture and share data analysis, user research, and learnings directly in context, with your team from anywhere you work.
Fermat's Library is a platform for illuminating academic papers. Just as Pierre de Fermat scribbled his famous last theorem in the margins, professional scientists, academics and citizen scientists can annotate equations, figures and ideas and also write in the margins.
Scholarlys is an AI tool for researchers that brings all the latest scientific content (Publications + Science News + Blog articles) in one place for users' research interests. It's like a newspaper for researchers.