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Machine Learning · head to head

Comet ML vs Datadog Logs

Comet ML logo

Comet ML

Machine Learning

Platform for tracking, comparing, and optimizing ML experiments

From
Free
Rated
-
Full reviewWebsite
Datadog Logs logo

Datadog Logs

Logging

Log Management and Analytics

From
$0.1/per GB ingested per month
Rated
-
Full reviewWebsite

The short version

  • Only Comet ML has a free tier, so it costs nothing to try first.
  • Each has a real cost: Comet ML the free cloud tier caps data at 25,000 spans a month with 60 day retention; Datadog Logs complex, multi-tiered pricing model based on ingestion, indexing, and storage; can become expensive at scale
  • They diverge on capability: Comet ML covers Experiment tracking, Datadog Logs covers Log ingestion.

Where they differ

Only the attributes on which Comet ML and Datadog Logs actually diverge.

Attributes where Comet ML and Datadog Logs differ
AttributeComet MLDatadog Logs
Starting priceFree$0.1/per GB ingested per month
Pricing modelfreemiumusage-based
Free tierYesNo
PlatformsWeb, Linux, Mac, WindowsCloud (AWS, Azure, Google Cloud, Oracle Cloud)
CategoryMachine LearningLogging
Founded20172010

Identical on both: 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 Datadog Logs

  • Log ingestion
  • Full-text search
  • Custom dashboards
  • Log-based metrics
  • API
  • Webhooks
  • REST
  • Api support

Both cover

  • Web support

What people use each for

The jobs each tool is most often brought in to do.

Comet ML

  • LLM observability and monitoringnot Datadog Logs
  • AI agent testing and debuggingnot Datadog Logs
  • Experiment tracking for machine learningnot Datadog Logs
  • Model registry and version managementnot Datadog Logs
  • ML model training monitoringnot Datadog Logs

Datadog Logs

  • Centralised log aggregation and analysisnot Comet ML
  • Multi-source log correlation with metrics and tracesnot Comet ML
  • Root cause analysis and troubleshootingnot Comet ML
  • Security monitoring and threat detectionnot 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

Datadog Logs

  • Complex, multi-tiered pricing model based on ingestion, indexing, and storage; can become expensive at scale
  • Ingestion pricing of $0.10/GB can accumulate rapidly for high-volume logging environments

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

Datadog Logs

$0.1/per GB ingested per month

No published plan breakdown. See the Datadog Logs review.

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.
Comet ML review

Choose Datadog Logs if

  • You need log ingestion.
  • You work on Cloud (AWS, Azure, Google Cloud, Oracle Cloud).
  • You also want full-text search.
Datadog Logs review

Questions people ask

Is Comet ML or Datadog Logs better?
Neither clearly leads. Comet ML starts at Free and Datadog Logs at $0.1/per GB ingested per month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Comet ML or Datadog Logs?
Comet ML has a free tier; the other does not. Paid plans start at Free for Comet ML and $0.1/per GB ingested per month for Datadog Logs.
Does Comet ML or Datadog Logs run on more platforms?
Comet ML runs on Web, Linux, Mac, Windows. Datadog Logs runs on Cloud (AWS, Azure, Google Cloud, Oracle Cloud).
Can I use Comet ML for free?
Yes. Comet ML has a free tier, so you can try it without paying. Datadog Logs starts at $0.1/per GB ingested per month.
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 Datadog Logs is typically brought in for.
What can Comet ML do that Datadog Logs cannot?
Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization. Datadog Logs covers Log ingestion, Full-text search, Custom dashboards, Log-based metrics. Both handle Web support.

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.

Source
Datadog Logs: What pricing options does Datadog offer for log ingestion and processing?

Log ingestion starts at $0.10/GB (annual billing; $0.10 on-demand). Standard indexing costs $1.70 per million events per month (annual; $2.55 on-demand). Flex Storage costs $0.05/million events stored per month (annual; $0.075 on-demand). Flex Logs Starter costs $0.60/million events stored per month (annual; $0.90 on-demand).

Source
Comet 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.

Source
Datadog Logs: What retention options are available and how does it affect pricing?

Standard indexing offers 15-day retention with options for 3 to 30+ days. Flex Storage supports flexible retention up to 15 months. Flex Logs Starter includes bundled compute for retention of 3-15 months.

Source
Comet 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.

Source
Datadog Logs: Is there a cost to forward logs to external systems?

Yes, log forwarding costs $0.25/GB outbound per destination for routing logs to external systems.

Source
Comet ML: Does Comet.ml offer academic pricing?

Yes, a free Pro plan is available for academic users; verification is required via signup.

Source
Datadog Logs: What discounts are available for high-volume customers?

Multi-year and volume discounts are available for customers processing 3B+ events per month.

Source
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