MAC
Start from Finder
On Mac, select two items in a monitored folder and open the comparison from Finder.
Hazybyte Studio 
Comparison app
WhatChanged
Compare files, folders, and text without changing the originals.
WhatChanged is a read-only comparison app for iPhone, iPad, and Mac. Review text changes, spot renames, use ignore rules, and create clearer reports when you need to see what moved.
iPhone, iPad & MacRead-only comparisonOne-time purchase
Visual tour
Compare where the work happens.
Start from Files, Finder, drag and drop, or direct text. WhatChanged keeps the originals read-only while the report separates what moved.
Use Finder when the comparison begins where the files already are.
The main change types stay together, so the review has one clear place to start.
COMPARE
Compare files or folders
Pick two items, set left and right, and see what changed without touching the originals.
CONTROLS
Ignore noise. Verify content.
Filter expected differences, quiet whitespace or line-ending changes, and use optional SHA-256 when a stricter check helps.
Review the merge plan before anything is created or copied.
Start from the workflow you already use
Open the comparison from the right place.
Use the main app for files, folders, and direct text. On iPhone and iPad, the share sheet is there for file-to-file checks. On Mac, Finder can become the entry point for monitored folders.
In the app
Choose two files or two folders, set the left and right sides, then compare.
From Files
On iPhone and iPad, select exactly two files and send them to WhatChanged through the share sheet.
From Finder
On Mac, compare inside WhatChanged or use the Finder workflow for items in monitored folders.
See the changes clearly
A report that keeps the review legible.
WhatChanged helps answer "what's different?" without turning the original files into a working area. Files, folders, and text stay read-only while the report separates the changes.
Report
Added, removed, modified, renamed
Folder reports keep the main change types together, including renamed items when they can be detected.Text files
Unified or split text diff
Supported text files can be reviewed in unified and split views, with inserted, removed, and changed lines made clear.Direct text
Compare pasted text
Direct Text Compare lets you paste or type text on both sides and compare without choosing files first.Ignore noise, verify content
Use stricter checks only when the comparison calls for them.
Some differences matter. Some are expected. WhatChanged gives you a small set of controls for reducing routine noise and checking content more closely when needed.
Ignore rules
Filter expected differences
Ignore hidden items, extensions, names, and patterns when they are not part of the question.SHA-256
Verify content when needed
Optional SHA-256 adds content-level verification, with caching for faster re-checks.Text options
Quiet formatting-only changes
Ignore line endings and whitespace-only changes when the content review needs less noise.Keep the result useful
A comparison can stay useful after the first pass.
Preview supported files
Open a supported file from the result when you need to inspect it before moving on.
Keep recent comparisons
Return to recent comparisons without rebuilding the same context from scratch.
Export or share reports
Keep a clear record when the result needs to be reviewed again or passed along.
Safe Merge
Make a new merged copy after comparing folders.
Safe Merge turns a completed folder comparison into a confirmed copy operation. You preview the plan first, choose how matching paths are handled, and keep the compared folders unchanged.
Preview before copying
After a completed folder comparison, review the merge plan, output folder, and safety notes before anything is created.
Choose the rule
Pick Newest, Oldest, Smallest, or Biggest to decide which same-path file is copied into the result.
Keep originals untouched
WhatChanged copies selected results into a new output folder, can add a README, and blocks unsafe destinations or overwrite risks.
Across Apple devices
The same question, answered where you are.
WhatChanged is built for iPhone, iPad, and Mac, with platform-specific entry points that keep comparison close to the files you are already looking at.
iPhone
App or share sheet
Start in WhatChanged, or send exactly two files from Files through the share sheet.iPad
Files, folders, drag and drop
Use the same app and share sheet flow, with drag and drop from Files for files or folders.Mac
App, drag and drop, Finder
Choose or drag-drop two files or folders, or compare from Finder inside monitored folders.Languages 25 languages, with an optional in-app language override.
Requirements iOS 16.6 or later, and macOS 14.6 or later.
Purchase One-time purchase. No subscription.
Good for
Practical checks with a clear answer.
- Backups
- Exports
- Cloud drives
- Builds
- Copy checks
Available now
A clear place to check what changed.
WhatChanged is available as a one-time purchase on the App Store for iPhone, iPad, and Mac, with no subscription.