When comparing Instapix: Pixel Art Editor vs Pixelmator, the Slant community recommends Pixelmator for most people. In the question“What are the best pixel art / sprite editors?” Pixelmator is ranked 11th while Instapix: Pixel Art Editor is ranked 31st. The most important reason people chose Pixelmator is:
Pixelmator's interface is pleasant to look at, easy to use and specifically optimized for OS X users, making it very intuitive for long-time Mac users.
Specs
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Pros
Pro Auto save/load
Pro Easy control with small touch screen
Pro Smart bucket tool for fill color
Pro Color pallet management
Pro Beautiful, easy to use UI
Pixelmator's interface is pleasant to look at, easy to use and specifically optimized for OS X users, making it very intuitive for long-time Mac users.
Pro Feature rich
Not only does Piexelmator provide easy to use tools that you should expect in any image editor, it also has rare tools such as layer styles, liquify tools and OS X optimized, fast image manipulation engine among others.
Pro Supports layer styles
Layer styles allow non-destructively applying effects to a layer.
Pro Powerful effects
Dozens of visual effects available, easily discovered from the visual Effects Browser, broken into categories. Effects have interactive dialogs and live preview.
Pro Multiple-display support
Pixelmator can be used across any number of monitors.
Pro Loads quickly
Gives you common image editing capabilities almost instantly.
Pro Great performance
Pixelmator's image engine is specifically optimized for use with Macs, providing one the best performance results available on OS X.
Pro Inexpensive
Pixelmator costs just $30 on the App Store. Additionally, it often comes bundled with other software that you might also find useful bringing the price down.
Cons
Con Only available as an Android app
You are limited to using this editor on your Android device only.