Comet

About Comet

Financials

Dated, source-cited figures. Estimates are marked.

Products by Comet

All products by Comet reviewed by our AI panel of experts.

Comet MLMachine Learning Platforms

Track, compare, and optimize your machine learning experiments

From $19/mo7.4/10

How Our Review Panel Scores Comet

Six independent reviewer personalities assessed Comet's product on their own terms. They disagreed by 1.0 points — The Skeptic was the hardest to convince, The Domain Strategist the most positive.

Averaged across 1 reviewed product in our catalog. Scores are out of 10.

Competitive Landscape

Who Comet competes with, and how they differ.

Weights & Biases8.0/10

Weights & Biases is Comet's closest rival in experiment tracking and is more deeply integrated with the PyTorch/HuggingFace ecosystem; Comet differentiates on self-hosted/on-prem deployment options and its newer open-source LLM eval tool, Opik.

1 product reviewed on TopReviewed

MLflow8.5/10

MLflow is a free, open-source project backed by Databricks with no dedicated vendor support unless bundled into the Databricks platform; Comet is a commercial SaaS/self-hosted product with dedicated support and a broader enterprise feature set.

1 product reviewed on TopReviewed

Langfuse8.0/10

Langfuse is open-source-first and priced around self-hosting for LLM tracing and evaluation; Comet's Opik competes directly in that space but ships from a company with an established enterprise ML experiment-tracking business already selling to the same buyers.

1 product reviewed on TopReviewed

ClearML7.8/10

ClearML bundles experiment tracking with its own orchestration and data-management layer under one open-source-first umbrella; Comet keeps experiment tracking, production monitoring and LLM evaluation (Opik) as more separable, API-first products.

1 product reviewed on TopReviewed

Arize AI8.1/10

Arize focuses on production ML/LLM observability and drift detection for large enterprises with a heavier, more specialized monitoring stack; Comet spans the full lifecycle from experiment tracking through production monitoring in one platform.

1 product reviewed on TopReviewed

Braintrust8.0/10

Braintrust is built specifically for LLM eval and prompt-iteration workflows for AI-native teams; Comet's Opik covers similar ground but is bundled with Comet's longer-standing ML experiment-tracking platform rather than sold standalone.

1 product reviewed on TopReviewed

Company Timeline

Key milestones in Comet's history, with sources.

1. Sep 17, 2024Launch

   Launches Opik, an open source LLM evaluation platform

   Comet launched Opik, an Apache-2.0 open source tool for tracing, evaluating and testing LLM applications and agents, building on its seven years of ML open-source work.

   comet.com
2. Nov 16, 2022Launch

   Introduces Kangas, an open source data exploration tool

   Comet open-sourced Kangas, a tool for large-scale visual dataset exploration, analysis and model debugging for computer vision and ML teams, released under Apache License 2.

   comet.com
3. Nov 18, 2021Funding

   Series B — $50M led by OpenView

   Comet raised $50M in Series B funding led by OpenView with Scale Venture Partners, Trilogy Equity Partners and Two Sigma Ventures participating, reporting 5x ARR growth and 150+ customers including Uber and Etsy.

   siliconangle.com
4. Apr 8, 2021Funding

   Series A — $13M led by Scale Venture Partners

   Comet raised $13M in Series A funding led by Scale Venture Partners with existing investors Trilogy Equity Partners and Two Sigma Ventures, citing over 500% revenue growth in the prior year.

   venturebeat.com
5. Apr 8, 2021Acquisition

   Acquires Stakion, a UK model-production-monitoring startup

   Alongside its Series A, Comet acquired Stakion, a UK-based model production monitoring company, folding its team into Comet's new Model Production Monitoring product.

   venturebeat.com
6. April 2018Funding

   Seed — $2.3M led by Trilogy Equity Partners

   Comet.ml raised a $2.3M seed round led by Trilogy Equity Partners with Two Sigma Ventures, Founders Co-op, Fathom Capital and Techstars Ventures, following its run through Amazon's Alexa Accelerator.

   finsmes.com
7. 2017Founded

   Founded in New York by Gideon Mendels and Nimrod Lahav

   Gideon Mendels and Nimrod Lahav founded Comet in New York to build GitHub-like project management and experiment tracking for machine learning teams, joining Amazon's inaugural Alexa Accelerator cohort.

   geekwire.com