De MonsterDebugger is an open source debugger for Adobe Flash, Flex and AIR. De MonsterDebugger is made in Flex and AIR by design studio De Monsters.

Download latest version
Monster Debugger is an open source debugger for Adobe Flash, Flex and AIR
It is made in Flex and AIR and offered for free by De Monsters


For most peoply the big download button will suffice, it holds the Monster Debugger as an AIR file. All necessary additional files can be copied from the application to your hard drive and you can launch the Monster Debugger game straight from the Monster Debugger as well. If you are looking for source code or an older versions of the application you have come to the right place.

All available files can be found right here. The project source and downloads are hosted on Google Code, you can find it by following the links for the repository. In case you do not have Adobe AIR installed, you can download it at

Classic Monster Debugger versions

De MonsterDebuggerv2.5.1
Download / Repository / November 7th, 2009

De MonsterDebuggerv2.5
Download / Repository / November 6th, 2009

De MonsterDebuggerv2.0.4
Download / Repository / June 15th, 2009

De MonsterDebuggerv2.0.3
Download / Repository / April 18th, 2009

De MonsterDebuggerv2.0.2
Download / Repository / March 12th, 2009

De MonsterDebuggerv2.0.1
Download / Repository / February 11th, 2009

De MonsterDebuggerv2.0
Download / Repository / February 2nd, 2009

De MonsterDebuggerv0.9
Download / Source code / October 15th, 2008

Download Monster Debugger the Game

Play Monster Debugger the Game everywhere you go without using this website by installing the following files:

  1. Install Adobe AIR, you'll need it to install the Monster Debugger and the Game.
  2. Install the Monster Debugger, it's the only way you'll be able to win.
  3. Install the Monster Debugger Game and kill bugs like a Monster!

Talk to us

Do you want to know what it's like to have Monsters on your side, join forces and create cool useful projects?

Talk to us at or visit

Tree structure

Tree structure, lets you walk through your entire application on code-level

more info

Live editing

Live editing, means you can edit properties and instantly see the effects in your application

more info

Easy traces

Detailed traces, lets you trace Strings, Numbers, XML, Arrays, Objects with great detail

more info

Function testing

Method testing, is very easy as you can run most methods and catch the results instantly

more info

How it works

How it works, install De MonsterDebugger, import AS3 class, add any traces, start debugging

more info

Open source

Open source, is the way De Monsters are releasing this application, you can use it for free

more info

Download MonsterDebugger version 2.5.1 (examples included)

If you share our ambition for clean coding and easier debugging please help us by spreading the word.