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WhyLabs

open source / Overall score: 2.0

AI observability platform for monitoring machine-learning models and LLM applications in production, covering data drift detection, performance monitoring and LLM security guardrails. It is built on the whylogs profiling library and the LangKit monitoring toolkit, and takes a statistical profiling approach that monitors distributions rather than individual requests.

WhyLabs, Inc. has discontinued operations, so the entry is scored on what remains runnable: the whylogs and LangKit libraries. The record declares no artifacts, which is why adoption has no signal route behind it.

Openness

5 high confidence

5.0

license: Apache-2.0(OSI, whylogs + LangKit + open sourced platform)
source: public(github.com/whylabs)
core features withheld: no — nothing is withheld - the company ceased operations and open sourced the platform on closure
hosted-SaaS: discontinued
status: company-ceased-ops, platform open sourced on closure

WhyLabs shut down as a company and open sourced its whole platform on closing, so the published source is now the entire product rather than a share of a live one. Both whylogs and LangKit are Apache-2.0, and nothing is withheld, so the platform reads as open source rather than open core.

https://github.com/whylabs/whylogs recorded 2026-08-13
Repository page. GitHub resolves the LICENSE to Apache-2.0 and the README carries an Apache 2 badge; the source tree is public. 2,830 stars.
https://pypi.org/pypi/langkit/json recorded 2026-09-29
PyPI metadata for langkit: "Apache-2.0" with the classifier "License :: OSI Approved :: Apache Software License"; summary "A language toolkit for monitoring LLM interactions" listing "sentiment analysis" and "toxicity analysis" and "prompt injection".
https://pypi.org/pypi/whylogs/json recorded 2026-09-29
PyPI metadata for whylogs 1.6.4 (released 2024-12-03): "Apache-2.0" with the classifier "License :: OSI Approved :: Apache Software License"; summary "Profile and monitor your ML data pipeline end-to-end".
https://whylabs.ai/langkit recorded 2026-09-29
Closure notice: "WhyLabs, Inc. is discontinuing operations." The linked text "complete WhyLabs platform has been open sourced" continues "to help support next iterations of AI observability research." It links the open sourced platform at github.com/whylabs/whylabs-oss. Searched the body for pricing, enterprise and license key: none.

Adoption

2 low confidence

2.0

WhyLabs' hosted platform has shut down, leaving GitHub stars on the whylogs repository as the only remaining signal, and a star is not a download or a use. The reading sits lower than stars alone would suggest because the commercial product is gone and the repository's release cadence has since stalled, reflecting residual open-source interest rather than a live platform.

https://api.github.com/repos/whylabs/whylogs recorded 2026-08-13
stargazers_count = 2830 for whylabs/whylogs, with pushed_at 2025-01-10T20:14:49Z. No download, install or customer figure exists for this product, the hosted platform having shut down.
https://github.com/whylabs/whylogs recorded 2026-06-04
2.8k stars, latest release v1.6.4 (Dec 3, 2024)

Capability

2 medium confidence

2.0

WhyLabs is a pair of monitoring libraries, not a full tracing, evaluation and prompt platform: whylogs profiles data for drift, and LangKit adds LLM safety metrics such as toxicity and prompt-injection detection. Both have been unmaintained since the company shutdown, with no tracing backend or prompt-management surface, leaving it well behind Langfuse.

https://github.com/whylabs/whylogs recorded 2026-08-13
README describes a data-logging and profiling library with integrations for AWS S3, Apache Airflow, Apache Spark and MLflow, designed to run "typically in a distributed environment, such as Ray or Apache Spark". There is no tracing backend, prompt-management or eval-experiment surface in it. The repository's last push was in January 2025.
https://pypi.org/pypi/langkit/json recorded 2026-09-29
PyPI metadata for langkit: "Apache-2.0" with the classifier "License :: OSI Approved :: Apache Software License"; summary "A language toolkit for monitoring LLM interactions" listing "sentiment analysis" and "toxicity analysis" and "prompt injection".
https://pypi.org/pypi/whylogs/json recorded 2026-09-29
PyPI metadata for whylogs 1.6.4 released 2024-12-03 with summary "Profile and monitor your ML data pipeline end-to-end"; the latest release is that one, so the library has had no newer release. Searched the description for tracing backend and prompt management: none.

Verified 2026-09-27