Comet vs Weights & Biases

In short

• Both: API, Self-hosted
• Only Comet states: Ask in plain language, Charts and dashboards, Builds models, Real-time data, Single sign-on
• Only Weights & Biases states: Command line, Official SDKs, Runs models for you, Builds agents and workflows, Traces and evaluates

Comet

Comet is an MLOps platform for tracking experiments, managing datasets and models, and monitoring machine learning systems.

Plans

Open Source

Free

• Full AI observability & agent testing feature set
• True OSS: same codebase as the hosted versions

Free Cloud

Free

• Up to 10 team members
• 25k spans per month
• 60-day data retention
• Agent tracing & analysis
• Test Suites & assertions
• Agent Playground

Pro Cloud

• $19 Per month

• Up to 50 team members
• 100k spans per month
• 60-day data retention
• Customizable monthly span limits
• Customizable data retention periods

Enterprise

Price on request

• Unlimited team members
• Custom usage plans
• Flexible deployments
• Service accounts and view-only users
• Single sign-on
• Dedicated support and SLAs

Free

Free

• 1 platform user
• Generous free tier
• Track and compare machine learning training runs
• Dataset management and versioning
• Model Registry
• LLM evaluation included for free

Pro

• $19 Per user/month

• Up to 10 users
• 1500 training hours included
• Email support
• Generous storage limits
• LLM evaluation included for free

Enterprise

Price on request

• Unlimited users
• Unlimited training hours
• Flexible deployments
• Model production monitoring
• Service accounts and view-only users
• Dedicated support and SLAs

Prices checked 2026-09-25 on the maker’s page.

Capabilities

• Ask in plain language — “Ask natural language questions to help root-cause issues, identify performance bottlenecks, and get debugging recommendations for your traces” source
• Charts and dashboards — “Built-in Charts” source
• Builds models — “One Platform to Train, Optimize, and Version Your Models” source
• Real-time data — “Easily track training metrics in real time, compare performance, debug, and evaluate models faster with built-in code panels.” source
• API — “Opik’s REST API and complete Python client can be used with both the Open-Source platform and Opik Cloud” source
• Self-hosted — “Self-hosting the open-source version of Opik is easy!” source
• Single sign-on — “Enterprise SSO (OAuth 2.0, SAML, and LDAP protocols)” source

Security

• SOC 2 Type II — “SOC 2 Type 2” source
• SOC 2 — “SOC 2 Type 2” source
• ISO 27001 — “ISO/IEC 27001:2022” source

Weights & Biases

AI developer platform for tracking experiments, managing models and datasets, and evaluating and monitoring AI applications.

Plans

Free

Free

• AI application evaluations
• AI application tracing
• AI application scorers
• AI model experiment tracking
• AI assets registry & lineage tracking
• Community Support

Pro

• Starts at $60/month, billed monthly

• Unlimited teams for collaboration
• Team-based access controls
• Service Accounts
• Priority email & chat support
• CI/CD automations
• Slack and email alerts

Enterprise

Price on request

• Single tenant option with choice of region
• HIPAA compliant option
• Secure private connectivity
• Customer-managed encryption key
• Single Sign On
• Automated user provisioning

Personal

Free

• 1 user seat
• Experiment tracking
• Registry & lineage tracking
• Run a W&B server locally on any machine with Docker and Python installed
• For personal projects only. Corporate use is not allowed.

Advanced Enterprise

Price on request

• Flexible deployment options
• HIPAA compliant option
• Secure private connectivity
• Customer-managed encryption key
• Single Sign On
• Automated user provisioning

Free forever for academic research

Free

• All the product features included on Pro
• Unlimited tracked hours
• 200GB of cloud storage
• Up to 25GB/mo of Weave data ingestion
• Up to 100 seats
• Additional cloud storage can be purchased for $0.03 per GB, billed monthly

Prices checked 2026-09-25 on the maker’s page.

Capabilities

• Command line — “You can then use the command line to start the server.” source
• API — “Each inference API has different costs for input and output tokens.” source
• Self-hosted — “Self-hosting allows you to run Weights & Biases on your own infrastructure, giving you full control over your data and privacy.” source
• Official SDKs — “Core | Reports | Automations | SDK” source
• Runs models for you — “Inference Access and explore hosted AI models” source
• Builds agents and workflows — “W&B Weave: Build agentic AI applications” source
• Traces and evaluates — “Monitor and analyze the performance of your GenAI models during development and in production, capturing inputs, outputs, and metadata for each inference.” source

Security

• SOC 2 Type II — “We are certified under ISO/IEC 27001:2022, ISO/IEC 27017:2015, and ISO/IEC 27018:2019, and remain compliant with SOC 2 Type 2 and HIPAA standards.” source
• SOC 2 — “We are certified under ISO/IEC 27001:2022, ISO/IEC 27017:2015, and ISO/IEC 27018:2019, and remain compliant with SOC 2 Type 2 and HIPAA standards.” source
• ISO 27001 — “We are certified under ISO/IEC 27001:2022, ISO/IEC 27017:2015, and ISO/IEC 27018:2019, and remain compliant with SOC 2 Type 2 and HIPAA standards.” source
• HIPAA — “We are certified under ISO/IEC 27001:2022, ISO/IEC 27017:2015, and ISO/IEC 27018:2019, and remain compliant with SOC 2 Type 2 and HIPAA standards.” source