Machine Learning · head to head
Comet ML vs MotherDuck
Comet ML
Machine Learning
Platform for tracking, comparing, and optimizing ML experiments
- From
- Free
- Rated
- -
MotherDuck
Databases
Serverless analytics data warehouse built on DuckDB
- 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; MotherDuck the free Lite plan caps compute at 10 hours per month, which limits it to light or hobbyist workloads.
- They diverge on capability: Comet ML covers Experiment tracking, MotherDuck covers Serverless DuckDB instances.
Where they differ
Only the attributes on which Comet ML and MotherDuck actually diverge.
| Attribute | Comet ML | MotherDuck |
|---|---|---|
| Pricing model | freemium | usage-based |
| Platforms | Web, Linux, Mac, Windows | web, api |
| Category | Machine Learning | Databases |
| Founded | 2017 | 2022 |
Identical on both: starting price (Free), 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 Comet ML
- Experiment tracking
- Code versioning
- Model registry
- Hyperparameter optimization
- Production monitoring
- PyTorch
- TensorFlow
- Keras
Only in MotherDuck
- Serverless DuckDB instances
- Cloud storage querying
- MCP server
- Dives
- Flights
- Read-scaling replicas
What people use each for
The jobs each tool is most often brought in to do.
Comet ML
- LLM observability and monitoringnot MotherDuck
- AI agent testing and debuggingnot MotherDuck
- Experiment tracking for machine learningnot MotherDuck
- Model registry and version managementnot MotherDuck
- ML model training monitoringnot MotherDuck
MotherDuck
- Ad-hoc analytics on gigabyte-to-terabyte datasetsnot Comet ML
- Querying data lake files in S3/GCS/Azure without ingestionnot Comet ML
- AI agent data analysis via MCPnot Comet ML
- Scheduled data pipeline transformationsnot 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
MotherDuck
- The free Lite plan caps compute at 10 hours per month, which limits it to light or hobbyist workloads.
- Business plan usage charges on top of the $250/month base can make costs less predictable than flat-rate competitors.
- There are no academic or non-profit discounts, unlike some competing data platforms.
- Annual billing requires going through a sales conversation rather than a self-serve toggle.
Pricing, plan by plan
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
MotherDuck
Free- LiteFree
- Up to 3 internal active users
- 2 service accounts
- 10GB free storage
- Business$250/month
- Up to 10 internal active users
- Unlimited service accounts
- 5 instance types with read-scaling replicas
- Enterprise$undefined/month
- Unlimited internal users and service accounts
- Fixed-cost capacity pricing
- AWS PrivateLink, IP allowlisting
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.
Choose MotherDuck if
- You need serverless duckdb instances.
- You want to start without paying.
- You work on web, api.
- You also want cloud storage querying.
Questions people ask
- Is Comet ML or MotherDuck better?
- Neither clearly leads. Comet ML starts at Free and MotherDuck at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, Comet ML or MotherDuck?
- Comet ML starts at Free and MotherDuck at Free.
- Does Comet ML or MotherDuck run on more platforms?
- Comet ML runs on Web, Linux, Mac, Windows. MotherDuck runs on web, 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 llm observability and monitoring, ai agent testing and debugging, experiment tracking for machine learning, model registry and version management. Of those, llm observability and monitoring and ai agent testing and debugging are not what MotherDuck is typically brought in for.
- What can Comet ML do that MotherDuck cannot?
- Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization. MotherDuck covers Serverless DuckDB instances, Cloud storage querying, MCP server, Dives.
Answered from the vendors’ own pages
Comet 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.
SourceMotherDuck: What does MotherDuck cost?
The Lite plan is free (up to 3 users, 10GB storage, 10 hours of Pulse compute/month). Business is $250/organization/month plus usage, with Enterprise available at custom fixed-cost pricing.
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.
SourceMotherDuck: Is there a free plan and what are its limits?
Yes, the Lite plan is free for up to 3 internal active users and 2 service accounts, with 10GB of storage and 10 hours of Pulse compute 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.
SourceMotherDuck: How is usage metered?
Compute instances (Pulse, Standard, Jumbo, Mega, Giga) are billed per second at hourly rates from $0.60 to $24.00/hour, storage is $0.04/GB-month, and AI Functions cost $1.00 per AI Unit.
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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- MotherDuck vs Anaconda
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- MotherDuck vs Apache Kafka
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- MotherDuck vs Turso
- MotherDuck vs Azure SQL
- MotherDuck vs ClickHouse
- MotherDuck vs Couchbase
- MotherDuck vs DuckDB
- MotherDuck vs MariaDB
- MotherDuck vs Oracle Database
- MotherDuck vs DataGrip
- MotherDuck vs Firebolt
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