iPhone is the most popular smart phone in the world with 225,000 apps in the store of Apple and more than 5 billion downloaded for these apps!! well, it should be an apps are suitable for logo designers to inspire or motivate creativity. So below you will find some useful organizational and other tools, I would like to share with you 25 iPhone apps you might find interesting if you are a logo designer.
1. Adobe Ideas
Adobe Ideas: is your digital sketchbook, letting you capture and explore ideas anywhere you go. Adobe Ideas is an ideal companion for the professional design applications from Adobe, including Adobe Illustrator and Adobe Photoshop software.
“Google logos (c) Google Inc. Used with permission.”
Otba Mushaweh is Logo Design Specialist, Graphic Designer and blogger. I am working as freelancer under my business Logos Guide Studio. I have established Logo Talks site to be great community and platform for designers, students and everyone who interested in all about logo, brand, typeface and typography...... 
Rob Janoff worked on many high tech accounts including, most notably, a new start-up called Apple Computer. He designed the now famous Apple Computer logo and all of Apple’s introductory graphics and advertising. Janoff then worked on national print and television accounts for advertising agencies in New York and Chicago.....