IndexReady vs Umwelt

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

IndexReady compared with Umwelt
Detail	IndexReady	Umwelt
What it does	Check if search engines and AI crawlers can read your AI-built website before launch	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	Not given	Not given
Pricing model	Freemium	Open source
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).
Key features	Check what crawlers see without JavaScript execution Verify robots.txt, sitemaps and status codes Check for noindex tags and canonical URL issues Generate copy-paste fix prompts for AI builders Audit up to 50 pages with Pro Weekly re-checks with email alerts	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	Made specifically for sites built with AI builders like Bolt, Replit, Cursor and Claude Code Instantly shows exactly what AI crawlers and search engines see Provides copy-paste fix prompts tailored to your AI builder framework Tests the raw HTML without running JavaScript, like real crawlers do	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	0	0
DR (Domain Rating by Ahrefs)	Not checked yet no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	0	4
Citation Flow (Majestic)	16	12
Referring domains (Majestic)	2	1

4 details filled in for both companies.

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