cheat.sh is described as 'The only cheat sheet you need' and is an app in the OS & Utilities category. There are seven alternatives to cheat.sh for a variety of platforms, including Mac, Windows, Linux, Online / Web-based and Android. The best alternative is CheatSheet, which is free. Other great apps like cheat.sh are TLDR pages (Free, Open Source), explainshell (Free, Open Source), cheat (Free, Open Source) and CheatKeys (Paid).
CheatSheet shows you the available shortcuts of the active application after holding the command-key for 2 seconds. After the panel shows up you can either type the shortcut or click the item in the panel to execute the command.
Cheat allows you to create and view interactive cheatsheets on the command-line. It was designed to help remind *nix system administrators of options for commands that they use frequently, but not frequently enough to remember.
Just hold the CTRL-Key a bit longer to see a list of available short-cuts in your current application. Smart rendering stacks short-cuts to fit the optimal screen space. Using an app that's not supported? One click and have it added to the integration queue.