Software · head to head
Comet ML vs Weights & Biases
Comet ML
Software
Platform for tracking, comparing, and optimizing ML experiments
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention; Weights & Biases pricing can be prohibitive for large teams without enterprise discounts
- They diverge on capability: Comet ML covers Code versioning, Weights & Biases covers Dataset versioning.
Where they differ
Only the attributes on which Comet ML and Weights & Biases actually diverge.
| Attribute | Comet ML | Weights & Biases |
|---|---|---|
| Pricing model | freemium | Unknown |
| Platforms | Web, Linux, Mac, Windows | Web, Python SDK, REST API |
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 Comet ML
- Code versioning
- Hyperparameter optimization
- Production monitoring
- scikit-learn
Only in Weights & Biases
- Dataset versioning
- Hyperparameter sweeps
- Collaborative dashboards
- Lightning
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.
Comet ML
- Tracking machine learning experiments, metrics and model versionsnot Weights & Biases
- Monitoring and evaluating LLM applications with tracingnot Weights & Biases
Weights & Biases
- Machine learningnot Comet ML
- Data analysisnot Comet ML
- Model trainingnot Comet ML
- Predictive analyticsnot Comet ML
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
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
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
Pricing, plan by plan
Comet ML
Free- FreeFree
- 100 experiments
- Basic features
- Community support
- Team$179/month
- Unlimited experiments
- Team collaboration
- Priority support
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
Which should you pick?
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.
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.
Questions people ask
- Is Comet ML or Weights & Biases better?
- Neither clearly leads. Comet ML starts at Free and Weights & Biases at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Comet ML or Weights & Biases?
- Comet ML starts at Free and Weights & Biases at Free.
- Does Comet ML or Weights & Biases run on more platforms?
- Comet ML runs on Web, Linux, Mac, Windows. Weights & Biases runs on Web, Python SDK, REST API.
- Can I use Comet ML for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Comet ML best used for?
- Comet ML is most often used for tracking machine learning experiments, metrics and model versions, monitoring and evaluating llm applications with tracing. Of those, tracking machine learning experiments, metrics and model versions and monitoring and evaluating llm applications with tracing are not what Weights & Biases is typically brought in for.
- What can Comet ML do that Weights & Biases cannot?
- Comet ML covers Code versioning, Hyperparameter optimization, Production monitoring, scikit-learn. Weights & Biases covers Dataset versioning, Hyperparameter sweeps, Collaborative dashboards, Lightning. 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.
Source