Diff Pro Max is a Mac application that addresses a routine but time-consuming problem: comparing two versions of a file to identify exactly what changed. The tool supports text, code, images, audio, video, documents, and spreadsheets — a scope that goes well beyond the typical code diff utility.
How it handles text and code
The text comparison feature is the core of the app and has no usage limit, even in the free version. Users paste text on each side or select files to compare, and the app highlights additions and removals in color with surrounding context. Syntax highlighting covers more than 150 programming languages. Three viewing modes are available: side-by-side, inline, and hunk view. Character-level diff detection, whitespace visualization, line numbers, and jump navigation let reviewers move between changes quickly.
Comparing everything else
Beyond text, the app offers comparison modes for nearly every file type. Folder comparison lists directory structures with color-coded added, changed, and deleted files, and allows filtering by file type and viewing size and modification dates. The Pro tier adds CSV and HTML export for folder diffs.
Image comparison uses an overlay view where two images are layered and transparency is adjusted to spot differences in positioning and spacing. A split view and synchronized zoom are also available. Supported formats include PNG, JPG, SVG, and WebP.
Audio comparison displays waveforms side by side with synchronized playback so users can hear the differences, plus metadata comparison for duration and sample rate. Supported formats are MP3, WAV, FLAC, and AAC. Video comparison offers A/B switching to spot frame-level differences with synchronized playback, along with resolution and duration metadata for MP4, WebM, MOV, AVI, and MKV files.
Document comparison covers PDF, DOCX, and PPTX with page-level visual diff detection, diff overlay display, and page and scroll synchronization. For spreadsheets, the app provides cell-level diffing with color-coded additions, changes, and deletions across sheets in XLSX format.
Deployment and revision tracking
The deployment data feature extracts changed files based on a specified date range, preserving directory structure and generating organized deployment packages. This is a Pro-only feature.
A snapshot system lets users capture the state of any file at any time, then compare past versions against current files. Change groups organize related files by project or task, with the free tier allowing one group containing three versions and three history entries. The Pro tier expands this with an add-on priced at JPY 1,500.
Pricing and availability
The free version covers unlimited text comparison with three comparisons per day for folders, images, audio, video, documents, and Excel files. History is capped at five entries, and exports are limited to text format.
Pro is a one-time purchase priced at JPY 2,500, which unlocks unlimited comparisons across all modes, export to CSV, HTML, and PDF, advanced filtering, preset saving, unlimited history storage, and expandable change groups. Prices are listed as reference values for the Mac version in Japan and may vary by platform and region.
What it is useful for
Diff Pro Max is positioned as a general-purpose comparison tool rather than a specialized code diff utility. Its strongest value proposition is the range of file types it handles under a single interface, particularly for designers and multimedia workflows where visual diffs for images, audio, and video matter as much as text diffs do for developers. The deployment data extraction and snapshot systems add a version-tracking dimension that goes beyond what most diff tools offer.