Pixelmator vs Pixly
When comparing Pixelmator vs Pixly, the Slant community recommends Pixelmator for most people. In the question“What are the best pixel art / sprite editors?” Pixelmator is ranked 11th while Pixly is ranked 14th. 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
Ranked in these QuestionsQuestion Ranking
Pros
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.

Pro Color selector with different color systems
RGB, CMY, HSB, and a somewhat different HUSL.

Pro Offers color ramp generator
Pixly offers a color ramp generator that then exports directly into a custom palette.

Pro You can use reference images
You can work with a reference image on top of your art, or by its side.

Pro Allows you to continue your work even when not in front of your PC
This tool works on both phones and tablets that run Android, which is handy for when you do not have access to a PC.

Pro Layered projects

Pro Gestures that feel natural on touch screens
In Pixly, you can move the art around with two fingers (like in Google Maps) and change the brush/eraser size with a three-finger pinch.

Pro Supports onion skinning
Onion skinning is also called ghosting. It allows the user to see the past and previous frames, while editing the current frame. This way, the user can make decisions on how to create or change an image.

Pro Mirroring support
In Pixly, the user can make symmetrical art with a mirror, or even go bananas setting up two or more mirrors at different angles at once.

Pro Transparency support
The user can make transparent sprites in Pixly.

Pro Animation support
Even though this is a mobile tool, it's fully featured and even allows you to create animations.

Pro Standard and custom palettes

Pro Live image tiling
The user can create tiles in Pixly and keep an eye on progress in real time.

Pro Color filters
Cons

Con No PC version
The PC version has not yet been released.
