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RobotCheck.coffee vs Umwelt

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

RobotCheck.coffee compared with Umwelt
DetailRobotCheck.coffee logo RobotCheck.coffeeUmwelt logo Umwelt
What it doesIs Your Website AI-Readable? An epistemic state engine that tracks what each character knows, and how they learned it
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Open source
PricingFree tool for checking individual websites. Optional API access via one-time purchases: €10 for 1,000 scans, €18 for 2,000 scans, up to €532 for 100,000 scans. API credits valid for 12 months. 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
  • robots.txt analysis
  • llms.txt checking
  • Sitemap XML validation
  • Schema.org validation
  • Open Graph checking
  • HTML structure analysis
  • Image alt text checking
  • Performance measurement
  • Canonical tag validation
  • Hreflang checking
  • 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
  • Free with no account required
  • Weekly rule updates reflecting latest LLM perception
  • Explicit rules for major AI crawlers
  • Actionable score with recommendations
  • 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 planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)18 +2 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)114
Citation Flow (Majestic)2712
Referring domains (Majestic)251

5 details filled in for both companies.

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