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Langfuse vs Kasset

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

Langfuse compared with Kasset
Detail LangfuseKasset logo Kasset
What it doesOpen Source Agent Evals & Observability AI note taker for online meetings and in-person conversations
StageEstablished MVP
FoundedNot given Not given
Based inDE BE
Pricing modelFreemium Paid
PricingNot given Kasset Core: €19/user/month or €180/user/year. Kasset Pro: €39/user/month or €384/user/year (includes one Plaud device on annual plan). Plaud devices can be purchased separately: Plaud Note Pro €189, Plaud NotePin S €159.
Key features
  • Hierarchical traces capture every LLM call, tool invocation, and retrieval step
  • LLM-as-a-judge, heuristic functions, or human review evaluations
  • Prompt management with one-click deployments and rollbacks
  • Playground to test prompts on real production inputs and compare models
  • Experiments with test cases and side-by-side comparison
  • Human annotation and collaborative human-in-the-loop workflows
  • Cost and latency monitoring with dashboards and alerts
  • REST APIs and Query SDK for data access
  • Langfuse Assistant to automate the AI engineering loop
  • Records online meetings from your computer without a bot joining the call
  • Captures conversations on iPhone and with Plaud Note Pro and NotePin S devices
  • Transforms conversations into structured notes with decisions and next steps
  • Integration with Claude, ChatGPT and Copilot through MCP protocol
  • Data stored and processed in the EU by default
  • GDPR compliant with no model training on user conversations
  • 1,200 transcription minutes per month on Core, unlimited on Pro
What makes it different
  • MIT licensed open source platform with no data lock-in
  • Enterprise scale architecture handling billions of monthly events
  • Works with any language and framework with no framework lock-in
  • Async by default so tracing never blocks your application
  • Records meetings without a bot joining the call, keeping your conversations private
  • Single unified library for online meetings, phone calls and in-person conversations
  • Never trains models on your conversations
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)80 +1 (up) since last check11 no change since last check
Trust Flow (Majestic)355
Citation Flow (Majestic)5417
Referring domains (Majestic)61141866

6 details filled in for both companies.

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