this is way better than the default roblox output (in 2014/2015)
https://www.roblox.com/library/140878711/Output-Checking-System-V1-3
Desc:
- Check output of any side, whether it's a server-side or a client-side of any player on the game.
- Stack trace for errors.
- Saves all data, so if you came late, you still can see all the data.
- Ability to communicate the data with your server/website.
- Open/Close the OutputGUI anytime and be able to enjoy the game while checking for errors.
Here's a slightly edited version that comments out marketplaceserviceĀ (used for update-checking) for compatibility. You can uncomment the whitelist check to make the output exclusive too.

