The idea is nice. The app is simple and the interface is minimalistic, which I like. However, there are some problems that concern me,

I created a tested document, and emailed to myself (to another email, just to be clear).

I receive the message, with orientations in English. As far as I could see, there is not way to change this. So if your customers speak other languages than English , this might get in the way.

The branding is way to invasive. After I signed the document, I saw this huge ad
https://cl.ly/4f2d61

I can imagine the customer, thinking I'm using a free solution. I feel this is not professional at all.

When I clicked the PDF button to download a copy, I received an error message:
https://cl.ly/37c92b and couldn't get my document.

To be honest, this looks like an app that might be good, but at this point, I don't trust it to communicate with clients.

Developer, please improve this.

I'm giving 2 tacos instead of one for the minimalist UI and the idea behind it.