The task manager app Linear does something interesting I have not seen before. In the keyboard shortcut tooltips, it highlights the modifier keys you already pressed, to give you confirmation you’re on the right track:

I think this is nice, particularly given that the modifier key situation is kind of a mess, and particularly if you consider some keyboards present their modifier keys like this:

I think it’s valuable to offer a connection between your fingers touching keys and something happening onscreen in real time – similarly how the blinker arrow in your car pulses exactly at the same rate as the sound it makes, to help you connect the two.

However, Linear does not do this in all the contexts:

While the first two videos might be simply bugs, I am not sure about the last three. It’s entirely possible this was done intentionally because these surfaces – the menus, the command palette, and the keyboard shortcut pane – do not support actually invoking the shortcuts. (Pressing the listed keys would not actually achieve anything.)

But I still wonder if this was a good call. One of the most important things for any new systemic pattern is building trust: making sure it’s consistently applied in all the nooks and crannies so that the user can understand what it does, learn to rely on it, and form the habit. Just one place where it doesn’t work might make it easy to just give up on it altogether.

Perhaps this is an example of how hard it is to design a cohesive system, which in Linear’s case is compounded by the fact that a lot of shortcuts start with regular keys like G and O and P, exacerbating focus issues. Either way, it’s delightful to see someone doing something new in this space.

I was impressed with this clever internal interface at Linear, shown inside this larger blog post:

The dev toolbar exists directly inside the app and allows us to easily toggle feature flags on and off. When something didn’t look right in the refreshed UI, it took us just one click to compare it with the previous version. That made it easier to determine whether the refresh had broken something or whether it had behaved that way before. Having the updates live behind feature flags also meant that instead of developing the redesign in isolation and shipping all the changes at once, we could integrate incremental changes to the platform.

I also cut it out here so it’s easier to see:

Here’s what I like about it:

• It’s a separate UI surface: Rather than being awkwardly integrated alongside production UI and adding jank to it, it is a clearly delineated toolbar you know users won’t ever see, allowing the rest of the interface to always feel like production.
• The feature flag toggling is easy: You don’t have to go anywhere else and possibly log in to toggle a flag, and you don’t have to wait for it to take effect. This will mean more people than just the core team members will be using it.
• Toggling this particular feature flag is as easy as clicking on a tile: I don’t know if anyone can promote others flags their care about to be easily toggle’able tiles, but I can imagine this really beneficial, too.
• The feature flag toggling is instantaneous without any visual jank: I understand that the best way to compare two things visually is to switch between them promptly in situ; our visual system is really good at spotting even small changes when aided this way.

Each one of the above bullet points is individually a small point of friction and easy to renege on, especially when it comes to internal-only interfaces. However, a combination of all of them results in great compounded interest, and I bet makes this interface effective – in addition to just feeling like fun to use.

Appreciate Linear sharing this internal detail; if you are using an interesting internal tool or UI that you are allowed to share, please consider it and let me know!