Available on the Mac App Store and Microsoft Store

What changed? Less searching. More clarity.

Still switching between two versions to find the edits? Diff Pro Max helps you compare files and see what changed. Text, code or images: focus on the differences and move on to your next task.

Compare files for free See how it works →
✓ Free text comparison, with no usage limit ✓ Other comparison modes: 3 free uses each per day ✓ Upgrade to Pro only when you need it
Diff Pro Max / Text comparison example
Before / invitation.txt
1Event invitation
−Starts: 13:00
3Room: Meeting room 1
After / invitation.txt
1Event invitation
＋Starts: 14:00
3Room: Meeting room 1
＋Doors open 15 minutes early

Red marks removals; green marks additions. Review changes with their surrounding context.

For your everyday reviews

Checking everything again,
just to find the edits?

When a revision arrives, during a review or before delivery: what matters is knowing what changed since the last version.

01 / Text & code

Reading line by line to find an edit?

Compare versions side by side, with additions and removals highlighted. Move between changes as you review.

02 / Images & design

The update is hard to spot?

Overlay two images and adjust their transparency to compare changes in positioning and spacing.

03 / Folders & delivery

Picking out updated files one at a time?

Review folder differences in a list. Use delivery data creation to extract files based on their modification date.

Your first comparison

Start with text you already have.

Try comparing a before-and-after pair before exploring the advanced settings.

1

Choose text comparison

Install the app and open Text Comparison from the home screen.

2

Add both versions

Paste text on each side, or select the files you want to compare.

3

Review the changes

See additions and removals in color, with the surrounding text for context.

Try it for free

Text comparison has no usage limit. No purchase required to get started.

FEATURES

A way to compare each kind of file.

Compare text, folders, images, audio, video, documents and Excel files. Choose the mode that fits your work.

Diff Pro Max Main Menu

7 Comparison Modes

Choose from text, folder, image, audio, video, document, and Excel comparison modes

Text Comparison

High-Precision Text Comparison

Syntax highlighting for 150+ languages

Folder Comparison

Folder Structure Comparison

Visualize directory structure changes

Deployment Data Creation

Auto Deployment Data Creation

Extract changed files by date range

Image Comparison

Image Overlay Comparison

Spot even the smallest design changes

Audio Comparison

Audio Waveform Comparison

Visually compare audio files with synchronized playback

📝

Text Comparison Always Free

Syntax highlighting for 150+ languages.
• Side-by-side / Inline / Hunk View
• Character-level diff detection
• Whitespace visualization
• Line numbers and jump navigation
✨ Unlimited use even in free version

📁

Folder Comparison 3/day

Instantly compare directory structures.
• Color-coded added/changed/deleted files
• Filter by file type
• Size and modification date display
• Export to CSV/HTML (Pro)
💎 Unlimited with Pro

🖼️

Image Comparison 3/day

Visually verify design differences.
• Overlay view for layered comparison
• Split view for side-by-side
• Opacity adjustment & synchronized zoom
• PNG, JPG, SVG, WebP support
💎 Unlimited with Pro

📤

Deployment Data 3/day

Auto-extract changed files by date range.
• Specify date range for diff extraction
• Preserve directory structure
• Generate organized deployment data instantly
• Dramatically streamline deployment workflow
💎 Unlimited with Pro

🎵

Audio Comparison 3/day

Visually compare audio files.
• Waveform display for side-by-side comparison
• Synchronized playback to hear differences
• Metadata comparison (duration, sample rate, etc.)
• MP3, WAV, FLAC, AAC support
💎 Unlimited with Pro

🎬

Video Comparison 3/day

Compare video files side by side.
• A/B switching to spot differences
• Synchronized playback for frame-level comparison
• Metadata comparison (resolution, duration, etc.)
• MP4, WebM, MOV, AVI, MKV support
💎 Unlimited with Pro

📄

Document Comparison 3/day

Visual diff for documents.
• Page-level visual diff detection
• Diff overlay display
• Page sync & scroll sync
• PDF, DOCX, PPTX support
💎 Unlimited with Pro

📊

Excel Comparison 3/day

Cell-level diff for spreadsheets.
• Color-coded added/changed/deleted cells
• Cross-sheet comparison
• Multiple comparison modes
• XLSX format support
💎 Unlimited with Pro

🎯

Pro-Only Features PRO ONLY

JPY 2,500 for lifetime access
• Unlimited comparisons
• Export to CSV, HTML, PDF
• Advanced filtering options
• Preset save & management
• Unlimited history storage

💾

Multiple Export Formats

Export comparison results in various formats.
• Free: Text format
• Pro: CSV, HTML, PDF support
• Save filter settings
• Export file lists
• Powerful report generation

VERSION MANAGEMENT

Compare the version you sent with the one you have now.

Save snapshots of your files so you can compare them later and keep track of revisions.

1
📸

Save Snapshots

Capture the state of any file at any time. Supports all file types: text, images, audio, video, documents, and Excel.

→
2
📁

Organize by Group

Create change groups for each project or task. Keep related files organized together.

→
3
🔍

Review Changes

Instantly compare past versions with current files. Know exactly what changed and when.

Free

1 group / 3 versions / 3 history

Pro

5 groups / 8 versions / 8 history

Pro + Add-on

Unlimited
Add-on +JPY 1,500

PRICING

Start free.
Choose Pro when you need more.

Try your own files first, then choose the plan that fits your work.

Pro is a one-time purchase. Prices shown are reference prices for the Mac version in Japan, in Japanese yen. Prices may vary by platform and region; check the price in the app before purchasing.

Free

0
For trying the app with your own files
  • Text Comparison (Unlimited)
  • Folder Comparison (3/day)
  • Image Comparison (3/day)
  • Audio Comparison (3/day)
  • Video Comparison (3/day)
  • Document Comparison (3/day)
  • Excel Comparison (3/day)
  • Deployment Data (3/day)
  • Change Groups (1 group / 3 versions)
  • 150+ Language Syntax Highlighting
  • Text Format Export
  • History Storage (Up to 5)
Try it for free

Pro

JPY 2,500
One-time purchase / Compare without daily limits
  • Unlimited comparisons
  • Video Comparison & A/B Switching
  • Document Comparison (PDF/Word/PowerPoint)
  • Excel Comparison & Cell-level Diff
  • Change Groups (Unlimited with Add-on +JPY 1,500)
  • Audio Comparison & Waveform Display
  • Advanced Filtering Options
  • Exclusion Pattern Settings
  • CSV/HTML/PDF Export
  • Preset Save & Management
  • Unlimited History Storage
Try it for free
COMPARISON

Free vs Pro

Check which features you need and what you can use for free.

← Scroll sideways to compare →

Feature Free Pro (JPY 2,500)
Text Comparison ✓ Unlimited ✓ Unlimited
Folder Comparison 3 times/day ✓ Unlimited
Image Comparison 3 times/day ✓ Unlimited
Deployment Data 3 times/day ✓ Unlimited
Audio Comparison 3 times/day ✓ Unlimited
Video Comparison 3 times/day ✓ Unlimited
Document Comparison 3 times/day ✓ Unlimited
Excel Comparison 3 times/day ✓ Unlimited
Change Groups 1 group / 3 versions ✓ Expandable (Add-on +JPY 1,500)
Syntax Highlighting ✓ 150+ languages ✓ 150+ languages
Export Formats TXT only TXT, CSV, HTML, PDF
History Storage Up to 5 ✓ Unlimited
Advanced Filtering ✗ ✓
Preset Saving ✗ ✓
Price 0 JPY 2,500 (one-time)
FAQ

Questions before you start

Pro is a one-time purchase, available as an in-app upgrade. The add-on that removes change-group limits is sold separately. Check the price and included features in the app before buying.
Text comparison is free with no usage limit. Folder, image, audio, video, document and Excel comparison, as well as delivery data creation, each include 3 free uses per day.
Compare text and code, images such as PNG, JPG, SVG and WebP, MP3/WAV/FLAC/AAC audio, and MP4/WebM/MOV/AVI/MKV video. Document comparison supports PDF, DOCX and PPTX; Excel comparison supports XLSX.
Yes. Download the Mac version from the Mac App Store, or the Windows version from the Microsoft Store.
Try two versions of a short text or code file where you already know what changed. Text comparison has no usage limit, so you can explore the controls at your own pace.

Next time you wonder what changed, give it a try.

Take a pair of files from before and after an edit.
Start by comparing them for free.

Download free for Mac Download free for Windows

Read the file comparison guide (Japanese)