Diaphora (διαφορά, Greek for 'difference') is a program diffing plugin for IDA Pro and Radare2, similar to Zynamics Bindiff or the FOSS counterparts DarunGrim, TurboDiff, etc... It was released during SyScan 2015.
It works with IDA Pro 6.9, 6.95 and 7.0. In batch mode, it supports Radare2 too (check this fork). In the future, adding support for Binary Ninja is also planned.
For more details, please check the tutorial in the "doc" directory.
Getting help and asking for features
You can join the mailing list https://groups.google.com/forum/?hl=es#!forum/diaphora to ask for help, new features, report issues, etc... For reporting bugs, however, I recommend using the issues tracker: https://github.com/joxeankoret/diaphora/issues
Please note that only the last 2 versions of IDA will be supported. As of today, it means that only IDA 6.95 and 7.0 are supported. Versions 6.8 and 6.9 do work (with all the last patches that were supplied to customers), but no support is offered for them.
You can check the tutorial https://github.com/joxeankoret/diaphora/blob/master/doc/diaphora_help.pdf
This is a screenshot of Diaphora diffing the PEGASUS iOS kernel Vulnerability fixed in iOS 9.3.5:
And this is an old screenshot of Diaphora diffing the Microsoft bulletin MS15-034: