When comparing i3 vs Fluxbox, the Slant community recommends i3 for most people. In the question“What are the best window managers for Linux?” i3 is ranked 1st while Fluxbox is ranked 8th. The most important reason people chose i3 is:
Every feature is thoroughly documented (including examples), and documentation is kept up-to-date. For questions that are not answered by the i3 [user guide](http://i3wm.org/docs/userguide.html), because they concern tools outside of i3 for example, there is the community [question & answer site](https://faq.i3wm.org/).
Ranked in these QuestionsQuestion Ranking
Pro Fully configurable (including tiling)
One of the biggest attractions of i3 is that it can be configured just about any way the user likes. Ranging from custom keyboard shortcuts to placement of opened apps, it is up to the user as to how they would like their window manager to behave.
Pro Easily switch to and manage floating windows
i3 can allow for the user to manage floating windows. Floating mode can be toggled by pressing $mod+Shift+Space. This way the user can take advantage of tiling as well as floating windows, all in the same session.
Pro Easily readable plain-text configuration
i3 has plain-text configuration, meaning that no lua or haskell is needed. This makes it rather easy to recommend i3 to other people without worrying whether or not they have the knowledge to configure it as it can be read by anyone without prior knowledge.
Pro Can tab windows
i3 permits tabbing through windows by turning on tab mode with $mod+w.
Pro Fast, especially on weaker hardware
Tiling means there are no fancy compositing or window effects to take up system resources.
Pro Can stack
i3 allows for stacking of windows in its environment.
Pro No window gap
Space is not wasted by separators, therefore making the most of the confined space on smaller monitors.
Pro RandR support
RandR provides more information about your outputs and connected screens than Xinerama does. To be specific, the code which handled on-the-fly screen reconfiguration (meaning without restarting the X server) was a very messy heuristic approach and most of the time did not work correctly — that is just not possible with the limited information that Xinerama offers (just a list of screen resolutions and no identifiers for the screens or any additional information). Xinerama simply was not designed for dynamic configuration.
Pro Can be reloaded quickly and configured without a client restart
Just two hot keys: Shift+Super+C to reload the config and Shift+Super+R to restart (which takes less than one second). Restarts pick up new versions of i3 or the updated config file, so you can upgrade to a newer version or quickly see the changes to i3 without quitting your X session.
Pro Sane development process
i3 uses test driven development with an extensive test suite to prevent bugs from ever happening again. All external contributions require a thorough code review to guarantee a certain level of quality.
Pro Terminal bell can be used to notify of completed actions
Terminal-bell gets passed through and marks the workspace visibly.
Pro Awesome multi-monitor support
User can assign specific workspaces to specific displays as well as apps to workspaces. This makes possible opening set of most used apps with 1 shortcut always on the same screens.
Pro Simple to use
Configuration is nearly automatic and simple, which can be really helpful to beginners.
Pro VIM Style key bindings
You can configure i3 so that your keys for moving windows is similar to vim, for example, M-j to move the window down.
Pro Great choice for keyboard users
The user keeps their hands in one spot (most of the time). One will find that the mouse is used less and less, making navigation quicker over time.
Pro Easy to use and configure
Fluxbox has its own panel, as well as a way to set a wallpaper, which makes it easy to use out of the box. Configuring Fluxbox to one's liking is easily done by simply editing text files.
Pro Ultra lightweight
Works FAST on any system.
Pro Simple mouse-driven menus
By simply right-clicking on the desktop, the user can pull up the root menu.
Pro No programming language knowledge required
In order to manage and edit Fluxbox settings and menus, the user does not require programming knowledge.
Pro Easy key binding
You can quickly and easily bind keyboard events to applications and wm events.
Pro It's easy to find many new styles and configuration options
Fluxbox has many great themes and config options that are ready for download and installation. In addition to this, there is great documentation on how one can make their own themes or edit their own configs to their liking.
Pro Simple tiling support
Automated tiling is optional and configurable by a simple text file.
Pro Styles (themes) are easy to manage, create, and change
Simple to style and has many styles available. You can also change styles real-time.
Pro Menu can stay visible or hidden for quick access to application launching
The Fluxbox menu system is easily configured to the user's liking, whether they want to keep it hidden or visible.
Pro Large user base and excellent online documentation
Fluxbox has an substantial, active user base, and great online documentation.
Con Missing "include" possibility in config
While pretty good and easy to use for common tasks, the configuration language is missing the
include directive common in other languages. You can use a workaround - a shell script to config parts on demand. It would be best if this were built-in however.
Con Poor floating window support
Sometimes this is necessary, even when the Dev rejects feature requests. Firefox child windows (option dialog) is an example.
Con No window gap option
You can do a lot with i3 but the official version lacks the option to have gaps between windows. However, there's a fork called i3-gaps that is almost the same as i3 except the fact that it lets you have gaps between windows.
Con Steep learning curve
Has a steep learning curve for beginners.
Con It has some issues with transparency
Using transparent windows can cause them to crash.
Con Not very configurable
Unlike XMonad or Awesome, i3 can't be configured in a turing complete language, so it is much harder to alter its core functionality to do exactly what the user wants.
Con Documentation is online
Can't access it offline unless you download the page.
Con The plain-text configuration may not be suitable for beginners
i3 is configured through a plaintext configuration file. While it's very powerful and easy to learn, it may not be entirely user-friendly for those who have never edited a text configuration.
Con Manual tiling
The layout isn't automatic. The user must move panels manually and may indeed end up spending time on that rather than on working with the application.
Con Requires setup of some configuration files
Con Difficult to master
It does take time to learn the ins and outs of all that can be changed by editing the configs. It can also take some time to finally attain a configuration that is perfect. Many users constantly change and edit their settings, but consider this part of the joy of using Fluxbox.
Con Comparatively heavy on system resources
Fluxbox is a bit heavier on system resources when compared to Openbox or other window managers (though it does come with more options as well).