architect apps on ipad pro

Most drawing and engineering/archiectural apps for iPad will be of a 2D nature.

I doubt that you will find many 3D drawing apps for iPads and iOS.

There are that many 2D CAD drawing apps and engineering drawing viewers for iOS.

The hardware and software power for these kinds of apps are simply NOT there.

If you already own an iDevice, do a search in the iOS App store for architectural or architectural drawing and see what you find.

The iPad is not a full blown computer replacement.

Here are some apps I have found.

Home Design 3D GOLD by Anuman

https://appsto.re/us/vPeQE.i

Home Design 3D by Anuman

https://appsto.re/us/D3BPy.i

Planner 5D Home Interior Design & Room Decorating by Planner 5D, LLC

https://appsto.re/us/ASxiK.i

ArchiTouch 3D - Design home plans - Free Floor Plan + Architecture CAD by GELYSOFT

https://appsto.re/us/7-lVZ.i

Do your own search in the iOS App Store for what you may need.

Good Luck!

If you plan to draw on an iPad, you might prefer the larger 12.9 iPad better.

This what I use to draw on my iPad.

The larger screen iPad is much, much better for drawing and less confining.

You can get a good deal on refurbished 9.7 or 12.9 inch screen iPad Pros from Apple's refurb store are treated as new product and carry all of the same Apple warranties.

Check out the store here and here's an example of the cost savings on a 12.9 inch screen iPad Pro for the 128 GB model.

http://www.apple.com/shop/browse/home/specialdeals

http://www.apple.com/shop/product/FL0N2LL/A/Refurbished-iPad-Pro-Wi-Fi-128GB-Spa ce-Gray

Good Luck!