When comparing Spectacle vs Moom, the Slant community recommends Moom for most people. In the question“What are the best power user tools for macOS?” Moom is ranked 19th while Spectacle is ranked 35th. The most important reason people chose Moom is:
Moom comes with many preset keyboard shortcuts. The user can go into the graphical settings of the app and change any one of them to a different combination of keys.
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Pros
Pro Free and open source
Spectacle is licensed under MIT with source code available on GitHub.
Pro Simple hotkeys
Spectacle offers easy-to-remember preset hotkeys.
Pro Mouseless
All windows in Spectacle can be controlled with keyboard shortcuts, so no mouse is needed. This makes for a fast way to control windows.
Pro Great UX
Spectacle is easy to use and configure. It's plug and play.
Pro Low footprint
Spectacle only uses up 18-19 MB of RAM, which means there is not much overhead by using this app.
Pro Multi-monitor support
Pro 7+ years of use
Using it for 7 years
Pro Customizable keyboard shortucts
Moom comes with many preset keyboard shortcuts. The user can go into the graphical settings of the app and change any one of them to a different combination of keys.
Pro You can save tiling window position and size
Users can set window position and size themselves, allowing for a great way to set up a tiling window experience.
Pro Windows can be snapped to the edges of the screen
In addition to using the grid or the overlay, Moom can move and zoom windows by dragging them to screen edges.
Pro Simple customization
While you can set keyboard shortcuts, Moom has a very easy-to-use GUI and GUI-based customization features to help you get going right away.
Pro Adds a zoom button for all apps
Moom adds an overlay zoom button to the corner of all apps which allows any app to go full screen or be placed to certain sections of the screen (such as the top, bottom, or sides). This works even on apps that do not normally allow for full screen views.
Pro Multi-monitor support
Moom has excellent support for multi-monitor setups. You can drag a window to the edge of your screen into another monitor and snap it there.
Cons
Con Not maintained
The software is free, but no longer seems to be maintained.
Con Impossible to add new functions
While keyboard shortcuts can be changed for the available actions, there is no way to add custom actions which in turn limits the functionality of the app.
Con Limited window sizing capabilities
You can use 1/2 of the screen vertically and horizontally (divide into 4 parts). You can also use the screen in thirds too, but only the left and right third: you can't use the 1/3 in the center. There is no way to do a more granular distribution.
Con Breaks on macOS High Sierra / Chrome or Firefox
Doesn't support side by side windows.
Con Doesn't work with any Adobe products
There are some apps like Adobe Reader that do not work with Spectacle. Basically, any app with a heavily customized UI that breaks OS X accessibility will not work correctly under Spectacle.
Con UI for settings can be confusing
The settings for the app are pretty jumbled and are hard to get a grip of, especially for first time users. While all the settings one would need are there, they are difficult to find or understand, which requires a good bit of playing around with the settings in order to get a feel for them and what they offer.
Con Not free
Moom is not free: it costs $9.99.
Con Non customisable popover
The pop over is not customisable and has two presets which are odd for instance two presents are two split windows horizontally.