Software · head to head
Weights & Biases vs Comet ML
Comet ML
Software
Platform for tracking, comparing, and optimizing ML experiments
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Weights & Biases pricing can be prohibitive for large teams without enterprise discounts; Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention
- They diverge on capability: Weights & Biases covers Dataset versioning, Comet ML covers Code versioning.
Where they differ
Only the attributes on which Weights & Biases and Comet ML actually diverge.
| Attribute | Weights & Biases | Comet ML |
|---|---|---|
| Pricing model | Unknown | freemium |
| Platforms | Web, Python SDK, REST API | Web, Linux, Mac, Windows |
Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Unknown), founded (2017).
What each one covers
Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.
Only in Weights & Biases
- Dataset versioning
- Hyperparameter sweeps
- Collaborative dashboards
- Lightning
Only in Comet ML
- Code versioning
- Hyperparameter optimization
- Production monitoring
- scikit-learn
Both cover
- Experiment tracking
- Model registry
- PyTorch
- TensorFlow
- Keras
- Hugging Face
- Web support
- Linux support
- Mac support
- Windows support
What people use each for
The jobs each tool is most often brought in to do.
Weights & Biases
- Machine learningnot Comet ML
- Data analysisnot Comet ML
- Model trainingnot Comet ML
- Predictive analyticsnot Comet ML
Comet ML
- Tracking machine learning experiments, metrics and model versionsnot Weights & Biases
- Monitoring and evaluating LLM applications with tracingnot Weights & Biases
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Weights & Biases
- Pricing can be prohibitive for large teams without enterprise discounts
- Limited integrations compared to some competitors
- Dashboard customization options limited on lower plans
- Requires some setup and configuration knowledge
Comet ML
- The free cloud tier caps data at 25,000 spans a month with 60 day retention
- Retention stays at 60 days even on the paid Pro plan, and extending it is a $29 per 100k spans add on
- Overage on Pro is $5 per additional 100,000 spans
- The free MLOps tier is a single user with 100 GB of storage and training hours governed by a fair usage policy
- Pro MLOps is $19 per user per month and caps the team at 10 users
Pricing, plan by plan
Weights & Biases
Free- FreeFree
- 5 model seats
- 5 GB storage
- 1 GB/month Weave ingestion
- Pro$60/month
- 10 seats
- 100 GB storage
- Private projects
- Teams$179/month
- Team collaboration
- Advanced analytics
- Dedicated support
Comet ML
Free- FreeFree
- 100 experiments
- Basic features
- Community support
- Team$179/month
- Unlimited experiments
- Team collaboration
- Priority support
Which should you pick?
Choose Weights & Biases if
- You need dataset versioning.
- You want to start without paying.
- You work on Web, Python SDK, REST API.
- You also want hyperparameter sweeps.
Choose Comet ML if
- You need code versioning.
- You want to start without paying.
- You work on Web, Linux, Mac, Windows.
- You also want hyperparameter optimization.
Questions people ask
- Is Weights & Biases or Comet ML better?
- Neither clearly leads. Weights & Biases starts at Free and Comet ML at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Weights & Biases or Comet ML?
- Weights & Biases starts at Free and Comet ML at Free.
- Does Weights & Biases or Comet ML run on more platforms?
- Weights & Biases runs on Web, Python SDK, REST API. Comet ML runs on Web, Linux, Mac, Windows.
- Can I use Weights & Biases for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Weights & Biases best used for?
- Weights & Biases is most often used for machine learning, data analysis, model training, predictive analytics. Of those, machine learning and data analysis are not what Comet ML is typically brought in for.
- What can Weights & Biases do that Comet ML cannot?
- Weights & Biases covers Dataset versioning, Hyperparameter sweeps, Collaborative dashboards, Lightning. Comet ML covers Code versioning, Hyperparameter optimization, Production monitoring, scikit-learn. Both handle Experiment tracking, Model registry, PyTorch, TensorFlow.
Answered from the vendors’ own pages
Weights & Biases: Does Weights & Biases have a free plan?
Yes. The Free tier includes 5 model seats, 5 GB storage, and 1 GB/month Weave ingestion. Academic users get unlimited tracked hours, 200 GB storage, and 100 seats at no cost.
SourceWeights & Biases: What are the paid plans for Weights & Biases?
Pro starts at $60/month with 10 seats and 100 GB storage. Team plans start at $179/month. Enterprise pricing is custom.
SourceWeights & Biases: What machine learning features does W&B provide?
Weights & Biases captures hyperparameters, metrics, and model outputs automatically. Features include experiment tracking, interactive Reports for sharing findings, Artifacts for managing datasets and models, advanced hyperparameter sweeps, and model deployment tools.
SourceRelated pages
More on Weights & Biases
Keep looking
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