Since Concepts is a vector drawing app, we save every stroke you draw to memory. More strokes = more memory used, and the amount of accessible memory we can save per drawing depends on what model iPad or iPhone you’re using:

When you run out of memory, Concepts can’t process your input anymore and will crash. The warning system provides you with advanced notice that a drawing is getting into the risky zone. If it’s working properly, a message will appear in the center of the status bar at the top of the screen.

 

It's hard to put exact numbers on it, but on devices with less memory, you may have issues at around 5,000 strokes. On the higher-end devices like the 12.9" iPad Pro, you can usually draw more than 30,000 strokes.

 

To keep your drawing from getting too large, we suggest you avoid importing a lot of large images and try to delete strokes or erase using the Slice tool rather than mask them all. Our masks create strokes that hide things instead of permanently altering your drawing, so the data still takes up memory.

 

If you use these tricks and still see the memory warning, you have a few options: