Use Kaleidoscope with CodaKaleidoscope is a source comparison tool / Coda is an IDE
Kaleidoscope is a cool source & image compare utility from Sofa. Coda is a cool IDE by Panic and uses the 'opendiff' Unix-command to compare source versions via SVN.
Opendiff starts Apple's FileMerge but we want to use Kaleidoscope! So, the first step to take is to setup the integration with SVN by following the steps shown by Kaleidoscope, when you choose Integration... from the Kaleidoscope menu.
The next step is to replace opendiff. To do that, execute the following two commands:
sudo mv /usr/bin/opendiff /usr/bin/opendiff.apple
sudo ln -s `which ksdiff` /usr/bin/opendiff
Now, start Coda, right-click a source file, choose Source Control->Compare with->Revision...
Pick a revision and now Kaleidoscope is used to compare both source files.
If you previously used Changes for source comparison, open Terminal and execute the following command to remove the Changes-plug-in from Coda:
rm -rf ~/Library/Application\ Support/Coda/Plug-ins/ChCoda.codaplugin