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ComputeSDK
Independent weekly benchmarks for infrastructure providers
- Developer Tools
- United States
- DR 52 +1 (up) since last check
Developer Tools
Umwelt
An epistemic state engine that tracks what each character knows, and how they learned it
- Community votes
- 0
- DR by Ahrefs
- 0 no change since last check
Ahrefs Domain Rating benchmarked 12 Nov 2026, rebuilt 12 Nov 2026.
Open source engine that tracks character knowledge and belief states across stories, games, and AI applications
What it is
Umwelt is an epistemic state engine that separates what actually happened in a story world from what each character knows, believes or remembers. It records the source and timing of every piece of knowledge—who saw it, who said it, and when—and can answer questions from any character's point of view at any moment in time.
It works with AI models, games, novels and tabletop campaigns. Instead of giving an AI model all the world information and asking it to pretend ignorance, Umwelt gives models only what their character actually knows, preventing information leakage and narrative contradictions. The engine runs in a single portable .umw file and works across TypeScript, .NET, command line and any language that can use its JSON protocol or C library.
What it is built with
- 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
Pricing
Pricing model: Open source
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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Umwelt metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 4 no change since last check |
| Citation Flow | 12 no change since last check |
| Referring domains | 1 no change since last check |
| External backlinks | 4 no change since last check |
Ahrefs Domain Rating benchmarked 12 Nov 2026, rebuilt 12 Nov 2026. Main build topic: Computers/News and Media (4). Majestic benchmarked 12 Nov 2026, rebuilt 12 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
Umwelt domain build sheet
Open the build sheet
| Domain age | 16 days |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc. |
| DNSSEC | Not signed |
Umwelt after-launch build log
Since Umwelt launched on Maker Launches on 12 November 2026, these are the figures we have tracked.
- Domain Rating (Ahrefs)
- 0
- First measured 12 Nov 2026
- Trust Flow (Majestic)
- 4
- First measured 12 Nov 2026
- Referring domains (Majestic)
- 1
- First measured 12 Nov 2026
Day 0 since launch. Next receipt: day 30, 12 Dec 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
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Questions from the bench
- Is Umwelt a database?
- It is an engine that keeps its state in one SQLite file. You record what happened and who knows it, then ask; you never write SQL.
- Do I need AI to use it?
- No. Umwelt never runs or calls a model. Games, novels and tabletop tools use it as it is; with a model, it decides what may enter the prompt.
- How is it different from a vector database or RAG?
- Retrieval finds what looks relevant. Umwelt answers who knows it and since when, and refuses what a character never learned, however well it matches.
- Can I use it in my game?
- Free games, mods and tabletop tools that make no money can, without releasing their code, by crediting Umwelt. Commercial projects can get a license.
- Is it fast enough for a game?
- Asking whether a character knows something takes 55 to 65 microseconds in a file with half a million Holdings on a laptop.
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