From: https://www.docusign.com/
Sign documents anywhere from any device A couple of taps on your iphone or iPad and you’re done. More secure than paper Documents are encrypted and a complete audit trail is maintained. Document cannot be changed and resides in the Cloud.
From: https://www.cudasign.com/features
Looks similar to docusign
Instead of digital signatures, we’ll be using electronic signatures. They are just like traditional ink signatures, but applied electronically to documents without any printing or scanning required.