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M3U8 Player vs Umwelt

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

M3U8 Player compared with Umwelt
Detail M3U8 PlayerUmwelt logo Umwelt
What it doesFree online M3U8 player for HLS playback, stream testing, and practical troubleshooting 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
PricingNot 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
  • Instant HLS playback from URL
  • Quality level selection and switching
  • Audio track selection
  • Subtitle support detection
  • HLS event log and diagnostics
  • Shareable embed code generator
  • QR code generation for stream sharing
  • Playlist manager with favorites
  • No account required
  • CORS and error troubleshooting guidance
  • 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
  • No video uploads or storage required
  • Supports live streams and VOD playlists
  • Works across browsers with hls.js fallback
  • Clear URL workflow without setup
  • Privacy-first design with no file uploads
  • 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)20 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)104
Citation Flow (Majestic)3212
Referring domains (Majestic)801

4 details filled in for both companies.

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