While I don't do a ton of flowcharting and graphing, I am a sucker for a great user interface (UI) and that's exactly what InstaViz gives me. While this App is a "+" App and it works on your iPhone, iPod touch or iPad, it really sings on the iPad. I love how I can use simple finger gestures and the App automatically converts them into vector shapes. I can add colors and text and then easily share my ideas in various formats. Rather than tell you about how cool this App is, it's easier to show you. Check out this video:
You can get InstaViz here from the App Store: 
InstaViz
InstaViz allows you to do diagrams, graphs and flowcharts on your iPhone, iPad or iPod touch using simple gestures to create vector shapes. You can then share your work in various formats.
- Pixelglow Software
- Get on App Store
- $9.99
All info was collected on 4th June, 2010 when the app was reviewed.
About Terry White
Terry is the co-author of The Best Selling "The iPhone Book" 1st, 2nd, 3rd and 4th editions. He has been active in the industry for over 25 years and is the founder and president of MacGroup-Detroit, Inc., Michigan's largest Macintosh Users Group, host of the Adobe Creative Suite Podcast and a technology writer - Terry White Tech Blog.
I’d add that at $9.95 it’s one-fifth the price of OmniGraffle’s $49.95. Even if it doesn’t do everything the latter does, it may do enough for many users.
Thanks for the heads up. It’s in my list of apps to look at when I do get an iPad.
It looks like a good start.
Can you connect objects with, say, curvy (bezier) lines?
It’s really too bad that it only exports editable files to Windows based applications. Maybe they’ll expand those choices soon.
Instaviz developer here.
@Mike: Instaviz also works beautifully on an iPhone and iPod Touch.
@Reese: When you connect objects, the app decides whether to use straight lines or beziers for the best layout. Instaviz exports to Graphviz GV, PDF, PNG and Visio VDX — the first three formats work on Mac OS X. You can also download my free viewer/printer application http://instaviz.com/instavue/ with loads more export options including SVG, Postscript etc.
It doesn’t appear that you can connect a node to itself. This is disappointing as I was hoping to use it to create state transition diagrams.
Other than that, it’s impressive and intuitive.