ComputeSDK vs Umwelt

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

ComputeSDK compared with Umwelt
Detail	ComputeSDK	Umwelt
What it does	Independent weekly benchmarks for infrastructure providers	An epistemic state engine that tracks what each character knows, and how they learned it
Stage	Not given	Not given
Founded	Not given	Not given
Based in	US	Not given
Pricing model	Freemium	Open source
Pricing	Platform: Free forever with unlimited Actions runs, public benchmark results via web, API and CLI, run logs, and unlimited benchmarks. Stealth benchmarks: $3,000/month per category or $30,000/year, including daily private runs of public benchmarks, stealth-only benchmarks, pinned regions, on-demand	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).
Key features	Weekly independent benchmarks for sandbox, storage, browser, and AI gateway providers REST API and MCP server for creating sandboxes and running benchmarks Stealth benchmarks with daily runs and on-demand reruns Git-first CI service called Actions Market for compute capacity sales Open methodology with all benchmarks publicly available Organization and member management Public benchmark results via web, API and CLI	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
What makes it different	Independent benchmarks with open methodology published weekly for free Same REST API and MCP endpoint available to agents directly Multi-provider SDK for sandbox execution and benchmark running Stealth benchmarks run privately for providers before public launch	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
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	2	0
DR (Domain Rating by Ahrefs)	52 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	11	4
Citation Flow (Majestic)	33	12
Referring domains (Majestic)	198	1

5 details filled in for both companies.

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