SimpleDiagrams is more for generalized visualizations like workflows, diagrams, value stream mapping, etc. I guess a similarity would be the hand-drawn look. I love @balsamiq. They've consistently done great things over the years. I wouldn't really compare my app to theirs. Balsamiq focuses on user interface mockups, which tends to involve more domain-specific controls and requires more complex application functionality.
Simple Diagrams Of Plants
Simple Diagrams For Sex Education
I read some of the reviews and decided to try it, 'Gardenhead' nailed it for me. Took me about 30 minutes to figure my way around around the app. My biggest concern and unknown was the 'Size' of the pallet or doc or whatever you want to call the a page. The Author uses Pixels, and initially I thought that was absurd, however once I did a little research and wrapped my head around Pixels Per Inch and the Resolution variable, I set the document to 2500 x 3300 (~8.5 x 11) no problems.After the intital 30 minutes I knew I was going to buy the app but was trying to get a project done...finally this morning after I finished, I forked the $$$$ over and am VERY happy. This was the 3rd app that I tried and felt like I was going to end up using Excel....at least Excel wouldn't freeze and I would not loose all my data and have to start over like I did with the previous two apps I tried. GLAD I came across SimpleDiagrams..I was a little put off by the 'Crayon-like' appearance, but found I could make things look VERY nice with the 'Clean' Style.Well Worth the Money... If I never use it again...it was worth it, but I can already see some things coming up.