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I have bought an Arduino UNO that turned out to be the Italian version (Arduino SRL) not the American one (Arduino LLC).

Now when I go to arduino.org and arduino.cc, they both have different versions of the IDE!

So, which one should I use (if they are even different) ?

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    Neither. Use UECIDE ;) – Majenko May 30 '16 at 12:48
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    Seriously though, the real answer is "It depends which side of the argument between the two Arduino parties you are on". Personally I am on the side of the .CC camp, so I would recommend to use the .CC version. Someone on the side of .ORG would recommend the .ORG version to use. – Majenko May 30 '16 at 12:50
  • Possibly unnecessary warning: if you are expecting to have a coding experience similar to other IDEs, you might be surprised that there are "magic" includes rules and what would normally work in a typical GNU-like project might not work. This is meant to simplify the life to beginners, but not everyone likes it. The alternative is to use a plain Makefile and your favorite means to deal with Makefile - based projects. – Igor Stoppa May 30 '16 at 18:07
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    .CC are open and welcoming. .ORG are sneaky and underhanded. For instance they create the same IDE but with a higher version number, so it appears newer than the .CC version. They also include (or have attempted to include) code to stop you being able to use non-.ORG boards. – Majenko May 30 '16 at 19:34
  • Personally I would use the Arduino.CC version. However I'm going to close this question as being primarily opinion-based. Sorry about that. – Nick Gammon Jun 4 '16 at 5:42
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You can use both IDEs no matter of the origin of the UNO even fake ones runs with the IDEs. The arduino.org IDE is just a fork of the arduino.cc. But arduino.org has many Board which are only run with the .org IDE.

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