| What it does | An epistemic state engine that tracks what each character knows, and how they learned it
| Compare files, folders and archives side by side on Windows
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| Stage | Not given
| Established
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| Founded | Not given
| 1995
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| Based in | Not given
| AT
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| Pricing model | Open source
| Free trial
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| Pricing | AGPL-3.0-only open source license. Commercial license available for closed-source products, services and hosted APIs. Free Play Exception covers free games, mods, interactive fiction and tabletop tools (excluding games with price, in-game purchases, ads, paid content or early access).
| from $35 one-time, per user. Free 30-day full-featured evaluation. Volume tiers available for teams. Free 2.x upgrade for WDiff32 licensees.
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| Key features | - Tracks what each character knows and how they learned it
- Prevents AI models from leaking story information or twists
- Records confirmed history that is never deleted
- Single portable .umw file for entire world state
- Works across TypeScript, .NET, CLI and any language via JSON protocol
- Query from any character's point of view at any moment in time
- Performance of 55-65 microseconds per query with half a million holdings
- Free Play Exception for non-commercial games and tabletop tools
| - Side-by-side text comparison with in-place editing
- Archive support for ZIP, 7-Zip, RAR, tar, CAB and ISO formats
- Rename detection for files and archives
- Recursive directory comparison with ignore rules
- Binary byte-by-byte comparison mode
- Folder synchronization with preview
- Export reports as HTML, plain text or JSON
- Integration with git, TortoiseGit, TortoiseSVN, IDEs and file managers
- Persistent hash cache for fast repeat comparisons
- Full Unicode support including UTF-8 and UTF-16
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| What makes it different | - Separates world state from character knowledge to prevent narrative leakage
- Guarantees written down with conformance testing across all clients
- Idempotent writes ensure consistency across retries
- Works without AI or can control what AI models are allowed to know
- Open source with commercial licensing option for closed-source products
| - No cloud, no accounts, no extraction required for archive comparison
- Rename detection identifies moved files instead of showing as delete plus add
- Native Windows application with persistent hash cache for speed
- Works without leaving the diff: edit, merge and save within the same window
- Free full-featured 30-day trial with no functional limits
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| Free plan | Not given
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| Open source | Not given
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| Platforms | Not given
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| Public API | Not given
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | Not checked yet ● no change since last check | 2 ● no change since last check |
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| Trust Flow (Majestic) | 4 | 8 |
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| Citation Flow (Majestic) | 12 | 9 |
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| Referring domains (Majestic) | 1 | 7 |
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Umwelt
Diffoniq™