Any mac design software with similar features to Sai?

[Hugbees]

Sai Paint Tools has a feature, the line straightener, which allows for very precise and straight lines with a tablet. However, Sai is only for Windows. Are there any other mac programs that have features similar to this? Photoshop sadly, does not have this

 

[AFPoster]

Check Pixelmator, not sure if it does but a good App to check.

 

[opeter]

You could try Sketchbook Pro: http://usa.autodesk.com/adsk/servlet/pc/index?siteID=123112&id=6848332

However, I think Paint Tool SAI and OpenCanvas and similar japanese tools are much superior to any of these western products in term of ink simulations.

 

[spacemanspifff]

Photoshop Line tool

Photoshop does have a line tool and if you hold down the shift key while you draw with your pen then you'll get a dead straight line.

Sorry if this is not what you wanted but I just thought I'd chip in.

 

[dmz]

I'll second the above comment, though, as far as i know, that technique only draws straight lines that are 0 or 90 degrees. You can force a straight line using the brush or pencil tool and single-clicking where you would like the line to begin, and then single-clicking where you want the line to end while holding down the shift key. If you keep holding down the shift key, you can keep clicking to extend the line in any direction, at any angle.

You might want to look at Corel's Painter products to see if they have a similar feature... www.corel.com

dmz