Karabiner VS Sizer

Compare Karabiner VS Sizer and see what are their differences

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Karabiner

Karabiner, previously called KeyRemap4MacBook, is a very powerful keyboard remapper for Mac OS X.

Sizer

Sizer is a freeware utility that allows you to resize any window to an exact, predefined size.

Landing page //
2023-10-06

Landing page //
2022-03-14

Karabiner

Website: karabiner-elements.pqrs.org
Pricing URL: Official Karabiner Pricing

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Sizer

Website: brianapps.net
Pricing URL: -

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Karabiner features and specs

Customizability
Karabiner-Elements allows users to remap keys and create complex keyboard configurations that can greatly enhance productivity and convenience.
Open Source
Being an open-source tool, Karabiner-Elements is free to use and comes with the potential for community contributions and transparency in development.
Flexibility
The tool supports a wide range of devices and configurations, making it adaptable to various user needs and setups.
Ease of Use
The user interface is designed to be intuitive, allowing both novice and experienced users to easily configure and remap their keyboards.
Regular Updates
The tool is actively maintained with regular updates, ensuring compatibility with the latest macOS versions and adding new features.

Possible disadvantages of Karabiner

Compatibility Issues
Some users may experience compatibility issues with certain applications or hardware, potentially causing unexpected behavior.
Learning Curve
Although the interface is intuitive, mastering its full range of features, especially for complex configurations, can require a steep learning curve.
System Performance
On occasion, Karabiner-Elements may consume significant system resources, which could impact overall system performance.
Limited Platform Support
As of now, Karabiner-Elements only supports macOS, limiting its utility for users on other operating systems such as Windows or Linux.
Potential for Errors
Incorrect configuration or updates may lead to errors in key mappings, which can disrupt the user experience until resolved.

Sizer features and specs

Ease of Use
Sizer provides a user-friendly interface that makes it easy for users to quickly resize windows to predefined dimensions. This is particularly useful for those who need to manage multiple windows efficiently.
Customizable Presets
Users can define their own window sizes, allowing them to create a personalized set of window dimensions that suit their specific workflow or screen setup.
Productivity Boost
By facilitating quick window management, Sizer helps improve productivity, especially for users who frequently switch between multiple applications or need precise window arrangements.
Lightweight Software
Sizer is a small and unobtrusive program that doesn't consume significant system resources, ensuring that it runs smoothly alongside other applications.

Possible disadvantages of Sizer

Compatibility Issues
Some users may experience compatibility problems with certain applications or operating system updates, which can limit the effectiveness of the tool.
Limited Features
While Sizer is effective for window resizing, it lacks additional features that are found in more comprehensive window management tools, such as advanced snapping or tiling options.
Windows-Only
Sizer is primarily designed for Windows operating systems, which excludes users on macOS or Linux from taking advantage of its functionality.
Manual Setup Required
Users need to manually set up their preferred window sizes, which might be time-consuming for some initially, especially if they require a large number of presets.

Analysis of Karabiner

Overall verdict

Karabiner-Elements is considered a good tool for macOS users seeking to customize their keyboard. Its reliability, versatility, and active community support make it a valuable addition to any power user's toolkit.

Why this product is good

Karabiner-Elements is highly regarded for its ability to customize and remap keyboard keys on macOS. It offers a powerful and flexible suite of features that allow users to tailor their keyboard setup to their specific needs, enhancing productivity and ergonomics. With an intuitive interface and extensive documentation, both novice and advanced users can benefit from its functionality.

Recommended for

Developers who need custom keyboard shortcuts.
Mac users experiencing discomfort with standard keyboard layouts.
Professionals requiring specific keybindings for software applications.
Users transitioning from Windows or Linux who want to emulate key behaviors from those systems.

Karabiner videos

+ Add

REVIEW: Should you play the Vetterli 71 Karabiner? [Hunt Gun Review #1]

Sizer videos

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sizer review

Category Popularity

0-100% (relative to Karabiner and Sizer)

Sizer

Automation

100 100%

Automation

0% 0

Window Manager

89 89%

Window Manager

11% 11

OSX Tools

0 0%

OSX Tools

100% 100

Note Taking

100 100%

Note Taking

0% 0

User comments

Share your experience with using Karabiner and Sizer. For example, how are they different and which one is better?

Social recommendations and mentions

Based on our record, Karabiner seems to be a lot more popular than Sizer. While we know about 277 links to Karabiner, we've tracked only 1 mention of Sizer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Karabiner mentions (277)

Ubuntu 26.04 LTS Released
As a both old Linux and now decade user of MacOS, after I got used to no middle-click paste and no focus-follows-mouse: 1. Keyboard shortcuts are Emacs, Ctrl-A: start of line, E: end of line, K: kill selected or to end of line, Y to paste, etc. https://support.apple.com/en-au/102650#text 2. Karabiner elements (FOSS) fixes keyboard mappings outside of the Settings: https://karabiner-elements.pqrs.org/ 3. I have the... - Source: Hacker News / 4 months ago
Show HN: BoringBar – a taskbar-style dock replacement for macOS
I've always setup my macbooks with a custom json config using https://karabiner-elements.pqrs.org/ to avoid the dock, but couldnt convince any friends to give it a try since its high effort, I guess so I hacked together https://dockshortcut.com really quick and that kinda made the difference in how some people use their macbooks these days, but tough market, nobody likes paying for something that should come out... - Source: Hacker News / 5 months ago
Claude Code Voice Mode
I've had success in the past in customizing macOS key bindings using Karabiner: https://karabiner-elements.pqrs.org/. - Source: Hacker News / 6 months ago
Ask HN: What Are You Working On? (July 2025)
Hey! These kinds of keyboard related things are well solved by Karabiner elements: https://karabiner-elements.pqrs.org/ There you can map (whatever key) to (whatever other key). E.g. I have right command mapped to F20, available to all other apps . - Source: Hacker News / about 1 year ago
Ergonomic Mac Keyboard Setup
I use Karabiner as the driver for keyboard customizations. Karabiner intercepts hardware keystrokes and sends keystrokes to the computer allowing me to configure Karabiner to have a flexible setup and map key(s) presses to other keys(s) or commands. - Source: dev.to / over 1 year ago

Sizer mentions (1)

Mix window covering up other programs - new issue
Here's a solution if you don't want to manually resize. I use a windows utility (Sizer) http://brianapps.net/sizer/ to size the window on the other monitor to fit the screen, That way it looks maximized but doesn't prevent me from switching to other windows. I've bound the Sizer app to a keyboard shortcut. That way I can detach the mixer, move it to the 2nd monitor, then use Sizer to max. Source: over 4 years ago