iconTechDraw is a full-featured drawing application, combining both built-in and user-defined geometric shapes with a text and equation editor. Documents can be backed up to the cloud, worked on collaboratively, and shared on the popular social media outlets. A full user manual is included in the app and TechDraw natively supports English, Spanish, French, German, Italian, Portuguese, Russian, Japanese, Chinese, Arabic, Hebrew, Hindi, and Bengali. TechDraw works on iPad, iPhone, iPod touch and Android devices.

The free, ad-supported versions are available here:
here Android app on Google Play here

The paid, ad-free versions are available here:
here Android app on Google Play here