Ulauncher comes with very reasonable defaults, looks good and just works.

ULauncher supports themes and comes with a good supply on install but more can also be made.

You can enter app name with a typo and Ulauncher will still be able to find it.

With Ulauncher you can easily add and update third party extensions. From kill process to windows switching, many of them work very well. The extension API is documented and if you know Python you can create and share your own extensions.

Unlike Albert or others, it is actually being maintained.

Ulauncher looks modern & can be customized with many themes.

Can fork, customize, and install instantly.

Extensions are easily created. Python script is all open to see. Not compiled like some.