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Machine Learning · head to head

Comet ML vs Uptime.com

Comet ML logo

Comet ML

Machine Learning

Platform for tracking, comparing, and optimizing ML experiments

From
Free
Rated
-
Full reviewWebsite
Uptime.com logo

Uptime.com

Logging

Website monitoring and uptime checker with 80+ global monitoring points

From
On request
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; Uptime.com pricing structure not fully detailed publicly
  • They diverge on capability: Comet ML covers Experiment tracking, Uptime.com covers Website monitoring.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Comet ML and Uptime.com actually diverge.

Attributes where Comet ML and Uptime.com differ
AttributeComet MLUptime.com
Starting priceFreeOn request
Pricing modelfreemiumsubscription
Free tierYesNo
PlatformsWeb, Linux, Mac, WindowsWeb, API
CategoryMachine LearningLogging
Founded2017Unknown

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 Uptime.com

  • Website monitoring
  • API monitoring
  • Synthetic monitoring
  • Page speed testing
  • Real User Monitoring
  • Status pages
  • Private locations
  • Global network

What people use each for

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

Comet ML

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

Uptime.com

  • Monitor website availability across multiple global locationsnot Comet ML
  • Test API endpoints and validate response timesnot Comet ML
  • Verify DNS resolution and certificate validitynot Comet ML
  • Track page load performance over timenot Comet ML
  • Send alerts to teams when issues occurnot 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

Uptime.com

  • Pricing structure not fully detailed publicly
  • Limited information on check frequency in basic plans
  • Real User Monitoring and status pages require add-ons
  • Lower-tier plans may have feature limitations

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

Uptime.com

On request

No published plan breakdown. See the Uptime.com 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 Uptime.com if

  • You need website monitoring.
  • You work on Web, API.
  • You also want api monitoring.
Uptime.com review

Questions people ask

Is Comet ML or Uptime.com better?
Neither clearly leads. Comet ML starts at Free and Uptime.com at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Comet ML or Uptime.com?
Comet ML has a free tier; the other does not. Paid plans start at Free for Comet ML and On request for Uptime.com.
Does Comet ML or Uptime.com run on more platforms?
Comet ML runs on Web, Linux, Mac, Windows. Uptime.com runs on Web, API.
Can I use Comet ML for free?
Yes. Comet ML has a free tier, so you can try it without paying. Uptime.com starts at On request.
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 Uptime.com is typically brought in for.
What can Comet ML do that Uptime.com cannot?
Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization. Uptime.com covers Website monitoring, API monitoring, Synthetic monitoring, Page speed testing.

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
Uptime.com: Does Uptime.com offer a money-back guarantee?

Yes, Uptime.com provides a 30-day money-back guarantee for new users, allowing risk-free trial of their service.

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
Uptime.com: What alerting methods does Uptime.com support?

All plans include email and SMS alerting with 20+ integrations available including Slack, Teams, PagerDuty, and webhooks for custom integrations.

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
Uptime.com: How many monitoring locations does Uptime.com have?

Uptime.com operates 80+ monitoring locations worldwide, enabling checks from multiple geographic regions to detect regional connectivity issues.

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
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