What's the best site/app for signing legal documents?

Disclaimer: the HelloSign tagline that's displayed here in PH seems out of date. They work with all documents, not just Gmail / Google Docs. I've found HelloSign to be among the simplest (vs. DocuSign and PandaDoc and a few others) to use and friendliest for your signatories. And, if you're a low volume user, it's free.

I use PandaDoc for all things e-sign because, unlike other tools that are like putting a piece of glass on top of a word doc, PandaDoc is an HTML document. You can build and edit content/ templates right in the app. I also like being able to track document activity and customize my design with CSS. People always comment on how easy it is to complete a PandaDoc.

I've used this for awhile and enjoy it. However, I've now switched to using Apple's native "markup" feature that you can access when opening a PDF attachment.

Quite simple app and does the job