Yes, both Paperpile and ReadCube Papers offer a Free Trial.
Paperpile is designed for Individuals, Medium Business and Small Business.
ReadCube Papers is designed for Individuals, Large Enterprises, Medium Business and Small Business.
Pricing for Paperpile Starts at $2.99/Month whereas for ReadCube Papers Starts at $3/Month.
Some top alternatives to Paperpile includes Qualified, Workvivo, The Papers, nXr, JabRef, Citavi, Zotero, Sciwheel, EndNote, ReadCube Papers, RefWorks and Paper Workspace.
Some top alternatives to ReadCube Papers includes Nimbus Note, Qualified, Workvivo, The Papers, Citavi, Zotero, Paperpile, Sciwheel, EndNote, RefWorks and Weava.