| What it does | Online JAR viewer and Java decompiler that runs entirely in your browser with no file uploads
| An epistemic state engine that tracks what each character knows, and how they learned it
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
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| Pricing model | Free
| Open source
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| Pricing | Not given
| 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).
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| Key features | - Inspect decompiled Java source code locally
- View JVM bytecode instructions, operands, and labels
- Explore class structure, fields, methods, and constant pool
- Section-aware hex view of class file bytes
- Support for JAR, WAR, and standalone CLASS files
- Search and filter files and classes by name
- Load remote JAR files from URLs with CORS support
- Preview and export text and image resources
- Web Workers for responsive decompilation
- Safety limits for archive processing: 512 MiB input, 100,000 entries, 2 GiB expanded content
| - 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
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| What makes it different | - 100% in-browser processing with no file uploads to servers
- Privacy-first design where files are processed locally only
- No installation, account, or Java runtime required
- Multiple inspection views: source, bytecode, hex, and constant pool
- Direct JAR URL loading from CORS-enabled servers
| - 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
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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 | Not checked yet ● no change since last check |
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| Trust Flow (Majestic) | 0 | 4 |
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| Citation Flow (Majestic) | 26 | 12 |
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| Referring domains (Majestic) | 18 | 1 |
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jarpeek
Umwelt