Diff Viewer

A powerful side-by-side text file comparison tool for iOS, iPadOS, and Mac.

Key Features

Side-by-Side Comparison

Compare two text files simultaneously with a clean, intuitive interface. The app automatically highlights differences with color-coded changes:

Green: Lines added to the right file
Red: Lines removed from the right file
Gray: Blank lines for alignment

Adaptive Layouts

iPhone: Optimized single-pane view with combined diff visualization
iPad & Mac: Full dual-pane layout with synchronized scrolling between left and right files

Synchronized Scrolling

On iPad and Mac, scroll through one file and the other automatically stays aligned, making it easy to compare corresponding sections.

Adjustable Font Size

Fine-tune text size and line spacing with easy-to-use toolbar controls. Font preferences are automatically adjusted based on device orientation and screen size.

Multiple Language Support

View sample files in English, Spanish, German, French, Chinese, Portuguese, Hindi, Indonesian, Arabic, Russian, and Japanese.

Persistent File Access

The app remembers your file selections across sessions using secure bookmarks, so you can quickly compare the same files again.

Easy File Management

Select files using the native file picker
View file names and modification dates
Delete files with a simple confirmation

How to Use

Select Files: Tap the left and right file buttons to choose the files you want to compare
View Differences: The diff view automatically highlights all changes between the two files
Adjust Display: Use the font size controls to make the text larger or smaller
Navigate: Scroll through the files, and on iPad/Mac, both panes stay synchronized

Contact

Diff Viewer was created by Brandon Thomson. You can contact me at diff-viewer@brandonthomson.com. My goal is to respond to all inquiries.

If you prefer, you can also use phone or SMS at (571) 202-6398.