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Apps with 'Real Time Comparison' feature

  1. Meld is a visual diff and merge tool. You can compare two or three files and edit them in place (diffs update dynamically). You can compare two or three folders and launch file comparisons.
  2. Flawless is a Mac desktop app to facilitate iOS development by helping you compare between mockups and implemented designs in real time. The tool includes overlay and split comparison modes with built-in iOS simulator to help ensure designs are as expected.