Side by side
Comet vs Weights & Biases
Both stand on model registries. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Comet covers both LLM observability and evaluation through Opik and machine-learning workflows through MLOps. Free plans are listed, while paid cloud and MLOps options begin at 19.00 USD at their stated billing terms.
Visit Comet
Choose Weights & Biases if your work needs experiment tracking alongside tools for evaluating and monitoring AI applications, with registry and deployment options. The free plan has defined seat and storage quotas, while teams above Pro’s stated employee guideline must transition to Enterprise. Consider the Personal plan only for personal projects, since corporate use is not allowed.
Visit Weights & BiasesThe facts
| Comet | Weights & Biases | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | No | No |
| Runs on | API, Linux, Mac, Self-hosted, Web, Windows | Android, API, iPhone, Linux, Mac, Self-hosted, Web, Windows |
| Lowest paid plan | MLOps Pro: $19 per user a month | Pro: $60 a month |
| Plans published | 11 | 5 |
| Maker | Not published | Not published |
| Website | comet.com | wandb.ai |
| On model registries | #1 of 38 | #3 of 38 |
Comet: what it does well
- Traces context retrieval, model responses and tool calls
- Evaluation includes test suites, datasets and experiments
- Integrates with more than 40 AI frameworks and providers
- Open-source Opik can be self-hosted
What to know first
- Free Cloud limits teams to 10 members and 25k monthly spans
- Free Cloud retains data for 60 days
- MLOps Pro is $19 per user/month
Weights & Biases: what it does well
- Tracks and visualizes machine learning experiments.
- Sweeps supports hyperparameter optimization.
- Weave includes tracing, evaluations, and monitoring.
- Registry tracks versions, aliases, lineage, and access control.
- Integrates with OpenAI, Anthropic, LangChain, and others.
What to know first
- Free plan is limited to five model seats and 5 GB monthly storage.
- Free plan includes 1 GB monthly Weave data ingestion.
- Pro is for early-stage teams with fewer than 50 employees.
- Personal plan is restricted to personal projects; corporate use is not allowed.
Alternatives to Comet Alternatives to Weights & Biases The whole list