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otx is the premier solution for developers trying to interperet otool output.

otx stands for "object tool extended". It uses otool (object tool) to disassemble a Mach-O executable file, then enhances the disassembled output. Simple enhancements include adding the machine code of each instruction and the offset of each instruction from the beginning of a function. More complicated enhancements include displaying the names and data types of Objective-C methods even if symbols have been stripped, and adding comments that describe member variables, function calls, static data and more.

otx users should have more...

What's New

Version 0.16b:
  • Source code is in the public domain
  • Includes a command line version
  • Smaller RAM footprint
  • Processing and UI use separate threads
  • Improved function recognition in dylibs
  • Improved logical block recognition
  • Optional separation of logical blocks
  • Optional verbose comments for objc_msgSend calls
  • Improved tracking of local variables
  • Recognizes more...


  • Mac OS X 10.4 or later
  • Apple otool installed

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otx User Discussion

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The Man In The Black Sedan Member IconReview+12
The Man In The Black Sedan

I couldn't live without OTX. There is nothing else like it. It is perfect in every way and all developers should have it in their toolbox.

Reply0 replies
Version 0.16b
karsten@briksoftware.com Member IconReview+47

great update!!!
thanks a lot for this useful tool!!!

Reply0 replies
Version 0.16b
Billy Ray Valentine Member IconReview+6
Billy Ray Valentine

A very valuable tool for developers, I use it all the time.

Really glad it supports UBs too.

Not only is it free, it's also open source.

Thanks for this great utility, and keep up the great work!

Reply0 replies
Version 0.15b
cippa Member IconReview+0

Only one word: Excellent!!!

Thanks for this invaluable tool!!


Reply0 replies
Version 0.14b
user icon+58
Version 0.16b
> 5 5


Current Version (0.x)


Downloads 12,754
Version Downloads 11,241
License Free
Date 27 Apr 2007
Platform OS X / PPC 32 / Intel 32
Price Free
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