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.

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About. De MonsterDebugger is a product by Dutch design studio De Monsters. De Monsters is run by three interaction designers that have a passion for designing and developing products that help creative professionals in their day to day work. De MonsterDebugger is one of those products, a spin-off of our startup: Blackbox.

De Monsters are developing Blackbox in ActionScript3 and use Adobe AIR for the desktop application that is part of Blackbox. As any developer does, we struggle with debugging our applications and were not totally happy with the available tools to help us in this constant struggle. That is why we developed our own debugging tool, and since it is not part of our core business, we decided to release it as an open source application.

The team that works on De MonsterDebugger is roughly the same as the team that works on PEF although De MonsterDebugger can definitely be considered to be Ferdi's baby. The three monsters: Ferdi, Erik & Paul are interaction designers above anything else and design the products as a team.

Ferdi is the lead developer at De Monsters and he has a true passion for ActionScript3 and AIR. He single-handedly created the first version of de MonsterDebugger and keeps improving it over and over. You can follow Ferdi on Twitter at @ferdikoomen.

Erik does all the visual design for De Monsters. For De MonsterDebugger he designed the Flex skin and this website. You can follow Erik on Twitter at @aapjerockdt.

Paul is the second developer of De Monsters. Besides coding in ActionScript3 he handles the more static web related development and server side and writes most of the copy, including the copy for this website. He also roars in public every now and then, giving presentations and pitching our products. You can follow Paul on Twitter at @uncle_paulie.

If you have any comments on De MonsterDebugger or if you have a good contribution for De MonsterDebugger that we can add into the main release, please feel free to send us an email at

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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.