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Kivel vs Umwelt

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

Kivel compared with Umwelt
DetailKivel logo KivelUmwelt logo Umwelt
What it doesCommand line interface for running utilities, creating webhooks, uploading and downloading files, and calling API endpoints An epistemic state engine that tracks what each character knows, and how they learned it
StageMVP Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Open source
PricingFree: $0 with 3 agents, 1,000 hosted runs/day, 64 MiB storage. Pro: $2/month with 25 agents, 20,000 hosted runs/day, 512 MiB storage. Team: $6/month per workspace with 100 agents, 100,000 hosted runs/day, 2 GiB storage. 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
  • Run utilities from pipes with JSON input and output
  • Create and manage webhook inboxes
  • Call any API endpoint with JSON body
  • Standard input limited to 10 MiB with 90 second timeout
  • Error reporting as JSON to standard error
  • 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
  • Built on TypeScript SDK for integration with Node.js projects
  • Works anonymously without API key
  • Supports self-hosted installations via KIVEL_URL
  • 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)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)04
Citation Flow (Majestic)012
Referring domains (Majestic)01

5 details filled in for both companies.

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