Software Development · head to head
Braintrust vs Comet ML
Braintrust
Software Development
The active observability platform for agents
- From
- Free
- Rated
- -
Comet ML
Machine Learning
Platform for tracking, comparing, and optimizing ML experiments
- From
- Free
- Rated
- -
The short version
- Each has a real cost: Braintrust enterprise plan pricing not published, requires custom quote; Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention
Where they differ
Only the attributes on which Braintrust and Comet ML actually diverge.
| Attribute | Braintrust | Comet ML |
|---|---|---|
| Platforms | Web | Web, Linux, Mac, Windows |
| Category | Software Development | Machine Learning |
| Founded | Unknown | 2017 |
Identical on both: starting price (Free), pricing model (freemium), free tier (Yes), user rating (Not yet rated).
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 Braintrust
Nothing recorded that Comet ML does not also cover.
Only in Comet ML
- Experiment tracking
- Code versioning
- Model registry
- Hyperparameter optimization
- Production monitoring
- PyTorch
- TensorFlow
- Keras
What people use each for
The jobs each tool is most often brought in to do.
Braintrust
- Monitoring production AI agents for qualitynot Comet ML
- Detecting patterns in agent failuresnot Comet ML
- Defining quality expectations before shipping agentsnot Comet ML
- Tracking prompts and tool calls in productionnot Comet ML
Comet ML
- LLM observability and monitoringnot Braintrust
- AI agent testing and debuggingnot Braintrust
- Experiment tracking for machine learningnot Braintrust
- Model registry and version managementnot Braintrust
- ML model training monitoringnot Braintrust
Where each one falls short
Documented limitations, not opinions. Every one is a constraint you would hit in normal use.
Braintrust
- Enterprise plan pricing not published, requires custom quote
- Pro plan includes 6-12 months free discount for startups only
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
Braintrust
Free- StarterFree
- $10 model credits monthly included
- 1 GB processed data monthly
- 10000 scores monthly
- Pro$249/month
- $249 model credits monthly included
- 5 GB processed data monthly
- 50000 scores monthly
- Enterprise$null/month
- Custom data retention and export capabilities
- RBAC and premium support
- On-premises or hosted solutions available
Comet ML
Free- Free CloudFree
- Up to 10 team members
- 25,000 spans per month
- 60-day data retention
- Pro Cloud$19/month
- Up to 50 team members
- 100,000 spans per month
- 60-day data retention
- MLOps FreeFree
- 1 user with fair usage policy
- Experiment tracking
- Dataset management
- MLOps Pro$19/user/month
- Up to 10 users
- 1,500 training hours included
- 500GB storage included
Which should you pick?
Choose Comet ML if
- You need experiment tracking.
- You want to start without paying.
- You work on Web, Linux, Mac, Windows.
- You also want code versioning.
Questions people ask
- Is Braintrust or Comet ML better?
- Neither clearly leads. Braintrust 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, Braintrust or Comet ML?
- Braintrust starts at Free and Comet ML at Free.
- Does Braintrust or Comet ML run on more platforms?
- Braintrust runs on Web. Comet ML runs on Web, Linux, Mac, Windows.
- Can I use Braintrust for free?
- Both have a free tier, so you can try either at no cost before committing.
- What is Braintrust best used for?
- Braintrust is most often used for monitoring production ai agents for quality, detecting patterns in agent failures, defining quality expectations before shipping agents, tracking prompts and tool calls in production. Of those, monitoring production ai agents for quality and detecting patterns in agent failures are not what Comet ML is typically brought in for.
- What can Braintrust do that Comet ML cannot?
- Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization.
Answered from the vendors’ own pages
Braintrust: Does Braintrust have a free plan?
Braintrust Starter plan is free and includes $10 model credits monthly, 1 GB processed data, 10000 scores monthly, and 14-day data retention with unlimited users and projects. No credit card required.
SourceComet ML: Does Comet.ml offer a free plan?
Yes, Comet.ml offers free tiers for both Opik (cloud observability) and MLOps platforms. Free Cloud Opik includes up to 10 team members and 25,000 spans/month. Free MLOps tier is limited to 1 user.
SourceBraintrust: How much does the Braintrust Pro plan cost?
Braintrust Pro plan costs $249 per month and includes $249 model credits, 5 GB processed data, 50000 scores monthly, and 30-day data retention. Qualifying startups receive 6-12 months free.
SourceComet ML: How many team members can use the free Comet.ml tier?
Free Cloud supports up to 10 team members. The Pro Cloud plan supports up to 50 team members at $19/month.
SourceBraintrust: What are Braintrust's overage charges?
Braintrust charges overage rates after monthly allocations: model credits beyond monthly allotment are charged at token rates, data overage is $4 per GB on Starter or $3 per GB on Pro, scores overage is $2.50 per 1000 on Starter or $1.50 per 1000 on Pro. Extended data retention beyond the included period costs $0.50 per GB per month.
SourceComet ML: What is a span in Comet.ml pricing?
A span represents a single tracked operation such as model requests or function calls. Free Cloud tier includes 25,000 spans per month.
SourceComet ML: Does Comet.ml offer academic pricing?
Yes, a free Pro plan is available for academic users; verification is required via signup.
SourceRelated pages
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