Download WhatChanged
WhatChanged targets users who manage repeated folder states and need fast verification of content differences. It compares two directories or snapshots and returns a categorized result list showing added, removed, modified, and unchanged items. The free version handles the complete comparison workflow without feature gates, while the Pro edition adds persistent snapshot files and exportable reports for sharing outside the application. Snapshot files capture a directory as a portable reference point, and comparison works between any combination of live folders and saved snapshots.
The reporting functions in the Pro edition produce CSV or standalone HTML files that preserve the same path and change metadata shown on screen. These outputs serve documentation, ticket attachments, and team handoffs where recipients cannot run the program locally. The interface avoids decorative elements and concentrates on the result list, status labels, and file details needed for rapid review.
WhatChanged is built for Windows and written in C#. It provides a controlled environment for folder state verification without cloud services or telemetry. The comparison engine emphasizes consistent hash-based detection, which keeps results stable across repeated scans. This makes the program suitable for regulated environments and offline workstations where repeatable output matters.
Use Cases for WhatChanged
| Compare folder sets to detect file differences | Track added, removed, modified files between directories |
| Audit directory changes over time intervals | Verify no unintended modifications after maintenance work |
| Save folder state into portable snapshot file | Create baseline evidence for later directory review |
| Label every item with clear change status | Quickly isolate new, deleted, or altered entries |
| Filter results by change type or filename | Find specific files inside large comparison outputs |
| Inspect selected file path and metadata details | Check individual differences without leaving main view |
| Switch interface theme for comfortable viewing | Reduce eye strain during long review sessions |
| Load snapshots as either comparison side | Compare archived states or live folder pairs |
| Export results to spreadsheet-compatible CSV file | Sort and filter diff data in Excel |
| Generate standalone HTML report for sharing | Email comparison summary without installing software |