When comparing Spectacle vs Alfred, the Slant community recommends Alfred for most people. In the question“What are the best power user tools for macOS?” Alfred is ranked 5th while Spectacle is ranked 35th. The most important reason people chose Alfred is:
Allows the creation of automated workflows by connecting keywords, hotkeys and actions together without writing code.
Specs
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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 Can create custom automated workflows
Allows the creation of automated workflows by connecting keywords, hotkeys and actions together without writing code.
Pro Full keyboard controls
You can do everything using just the keyboard.
Pro Built-in calculator
Alfred is able to handle simple mathematical commands and more extensive expressions alike. Pressing Enter copies the result to the clipboard.
Pro Integrates with 1Password
Alfred allows getting secure and fast access to your 1Password 1Click bookmarks.
Pro Lightweight and smooth
Alfred is a lightweight application for OS X and runs smoothly, even on older devices.
Pro Versatile search
Quickly search for files, applications and web services from the same input.
Pro Productivity booster
Helps speed up your working day one shortcut at a time.
Pro Clipboard history
Alfred offers a clipboard with an extensive history for quick access to your copied text, images and links.
Pro Entry of everything
Pro Allows theming
Alfred allows adjusting colors, fonts, sizes and more to create new themes.
Pro Offers both a free version and a paid version available
The paid version is more customizable, but the free version is still very powerful.
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 Many features require the $25 powerpack add-on
Features like custom workflows, clipboard history, 1Password integrations and others require the powerpack add-on.