Softwr

Machine Learning & Data Science · head to head

Comet ML vs Notion

Comet ML logo

Comet ML

Machine Learning & Data Science

Platform for tracking, comparing, and optimizing ML experiments

From
Free
Rated
-
Notion logo

Notion

Technology

All-in-one workspace for notes, tasks, wikis, and databases

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; Notion free plan limited to 1,000 blocks for 2+ member workspaces, restricting team usage
  • They diverge on capability: Comet ML covers Experiment tracking, Notion covers Rich text editing with blocks.

Where they differ

Only the attributes on which Comet ML and Notion actually diverge.

Attributes where Comet ML and Notion differ
AttributeComet MLNotion
Pricing modelfreemiumUnknown
PlatformsWeb, Linux, Mac, WindowsWeb, iOS, Android
CategoryMachine Learning & Data ScienceTechnology
Founded20172016

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 Notion

  • Rich text editing with blocks
  • Customizable databases
  • Kanban boards and calendars
  • Real-time collaboration
  • Template library
  • File attachments
  • Web clipper
  • API access

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 Notion
  • Monitoring and evaluating LLM applications with tracingnot Notion

Notion

  • Project managementnot Comet ML
  • Knowledge base creationnot Comet ML
  • Note-taking and documentationnot Comet ML
  • Team collaborationnot Comet ML
  • Content planningnot 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

Notion

  • Free plan limited to 1,000 blocks for 2+ member workspaces, restricting team usage
  • Free tier only includes trial AI capabilities; full Notion AI requires paid plan
  • Page history limited to 7 days on free plan
  • Per-member pricing increases costs for teams compared to flat-rate competitors
  • Limited automation capabilities compared to dedicated workflow platforms

Pricing, plan by plan

Comet ML

Free
  • FreeFree
    • 100 experiments
    • Basic features
    • Community support
  • Team$179/month
    • Unlimited experiments
    • Team collaboration
    • Priority support

Notion

Free
  • FreeFree
    • 1000 block limit (2+ members)
    • 7-day page history
    • 5MB file upload cap
  • Plus$10/month
    • Unlimited blocks
    • 30-day page history
    • Unlimited file uploads
  • Business$20/month
    • All Plus features
    • Notion Agent
    • AI Meeting Notes
  • Enterprise$null/custom
    • All Business features
    • Advanced controls
    • Audit logs

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 Notion if

  • You need rich text editing with blocks.
  • You want to start without paying.
  • You work on Web, iOS, Android.
  • You also want customizable databases.

Questions people ask

Is Comet ML or Notion better?
Neither clearly leads. Comet ML starts at Free and Notion at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Comet ML or Notion?
Comet ML starts at Free and Notion at Free.
Does Comet ML or Notion run on more platforms?
Comet ML runs on Web, Linux, Mac, Windows. Notion runs on Web, iOS, Android.
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 Notion is typically brought in for.
What can Comet ML do that Notion cannot?
Comet ML covers Experiment tracking, Code versioning, Model registry, Hyperparameter optimization. Notion covers Rich text editing with blocks, Customizable databases, Kanban boards and calendars, Real-time collaboration.

Answered from the vendors’ own pages

Notion: What are Notion's pricing tiers?

Notion offers four plans: Free ($0/member/month), Plus ($10/member/month), Business ($20/member/month recommended), and Enterprise (custom pricing). All paid plans include Notion AI and identical features with no per-feature charges.

Source
Notion: What is included in Notion's free plan?

The free plan includes databases with limited collaborative blocks, trial AI capabilities, basic forms, basic sites, Notion Calendar, and file uploads. For workspaces with 2+ members, there is a 1,000-block limit.

Source
Notion: How much does Notion AI cost?

Notion AI is included with Plus ($10/mo), Business ($20/mo), and Enterprise plans. Free and Plus plans include limited AI trial capabilities. Custom Agents cost $10 per 1,000 monthly credits after free trial.

Source
Notion: Can guests access Notion workspaces without payment?

Yes. Guests are free of charge on all plans including the free tier. Free tier allows 10 guests; paid plans include unlimited guests. Guests can only access individual pages they are invited to.

Source
Notion: Does Notion integrate with other apps?

Yes. Notion integrates with 100+ third-party apps including Slack, Google Drive, GitHub, Google Calendar, Trello, Jira, Zapier, and many others. Native integrations are available plus additional connections via Zapier.

Source

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