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LLM Observability Index

LangWatch

Open-core platform for tracing agents, running simulated-user tests and evaluations, and versioning prompts

By LangWatch (Reasoning Engine B.V.) · langwatch.ai

Package download activity

Each package is shown on its own; packages that can be installed together are never added up. Week 2026-W40 (2026-09-28 to 2026-10-04).

npmlangwatch · headline (ranked)

50,105 downloads in the week, +4.9% vs prior week · rank 12 on npm

2026-W29: 22,9252026-W30: 28,4882026-W31: 28,9882026-W32: 50,7582026-W33: 44,4892026-W34: 66,2622026-W35: 52,3132026-W36: 41,6922026-W37: 37,6892026-W38: 46,8302026-W39: 47,7442026-W40: 50,105
2026-W29 to 2026-W40, 12 weeks; min 22,925, max 66,262

Reproduce this number (npm API) · registry metadata (mapping checked 2026-10-07)

Packages not measured

The vendor's docs name these packages, but their registry metadata does not link the vendor's domain or GitHub organisation, so under our mapping rule they are not counted. No download number is shown for them.

  • PyPI langwatch: registry metadata has no project/repository/homepage link (registry metadata, checked 2026-10-07)

GitHub stars

langwatch/langwatch: 4,923 stars (rank 20). Stars are a point-in-time count of a repository's bookmarks, not people using the tool.

Series starts 2026-W40 (4,923).

Reproduce (GitHub API) · repository link source

Facts

Facts for LangWatch
CategoriesTracing & observability, Evaluation, Prompt management, Gateways with observability
StatusGenerally available
LicenceApache-2.0 (open core)source, checked 2026-10-07
Self-hostYessource, checked 2026-10-07
OpenTelemetryNative (OTLP)source, checked 2026-10-07
Pricing modelper-seat
Entry pricenot published in USD (EUR on page, no conversion (EUR 29 per core-seat per month)); Growth plan is EUR 29 per core-seat per month plus EUR 5 per 100k events above 200k included; Developer plan is free (50k events/month, 2 users). Page has a EUR/USD toggle but only EUR was visible in the server-rendered page, so no USD figure recorded.source, checked 2026-10-07
Free tierYes
MeasurabilityMeasured (mapped SDK packages)

Facts last verified 2026-10-07 on first-party pages. Prices as published, taxes excluded; non-USD prices are not converted.

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Spotted an outdated fact? The methodology page explains how facts are checked; corrections are applied at the next weekly build.