JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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If you are using the E-Signature widget on the Form, it can be use also using devices that have touchscreen feature.
Example, on mobile device... you can simply use the touchscreen technology to use your finger to do input on the device.
You can open this test form https://form.jotform.com/53007280666959? on any of your device that have touchscreep feature (mobile phone, tablet, etc..)
Hope this answers your inquiry. Let us know if you need further assistance.