Comet ML vs Spotlight by Backplanes: Which is Better in 2026?
Choosing between Comet ML and Spotlight by Backplanes comes down to understanding what each tool does best. This comparison breaks down the key differences so you can make an informed decision based on your specific needs, not marketing claims.
Bottom line: Comet ML is our overall pick for analytics workflows. Pick Spotlight by Backplanes if you need AI agents.
Short on time? Here's the quick answer
We've tested both tools. Here's who should pick what:
Comet ML
Machine learning experiment tracking platform
Best for you if:
- • You need analytics features specifically
- • Comet ML is an experiment tracking platform for machine learning teams
- • It logs metrics, parameters, and artifacts automatically to compare and reproduce experiments
Spotlight by Backplanes
Understand, improve, and track your AI agent sessions
Best for you if:
- • You need something completely free
- • You need AI agents features specifically
- • Provides detailed session reports for AI agents (Claude Code & Codex).
- • Automatically captures agent activity, redacts PII, and highlights key findings.
| At a Glance |  Comet ML |  Spotlight by Backplanes |
|---|---|---|
Starts at | $19/month per userPro | FreeFree tier available |
Best For | Analytics | AI Agents |
Rating | 4.3/5 | - |
Free plan | No | Yes |
Choose Comet ML or Spotlight by Backplanes?
Choose Comet ML if
Machine learning experiment tracking platform
- Experiment tracking
- Model production monitoring
- Good visualizations
- Your work is analytics-shaped, not AI agents-shaped
Choose Spotlight by Backplanes if
Understand, improve, and track your AI agent sessions
- Provides deep visibility into AI agent behavior that is otherwise invisible.
- Helps optimize agent performance and identify cost-saving opportunities.
- Offers tailored reports for different organizational roles (security, engineering, finance).
- You want a fully free tool (Comet ML requires payment)
- Your work is AI agents-shaped, not analytics-shaped
| Feature | Comet ML | Spotlight by Backplanes |
|---|---|---|
| Pricing Model | Paid | Free |
| User Rating | ★4.3/5 24 reviews | No ratings yet |
| Categories | AnalyticsData Visualization | AI AgentsAnalytics |
In-Depth Analysis
Comet ML
Machine learning experiment tracking platform
Strengths
- +Experiment tracking
- +Model production monitoring
- +Good visualizations
- +Fair pricing
- +LLM support
Weaknesses
- -Less known
- -Smaller community
- -Some features basic
- -Documentation gaps
- -Integration limitations
Key features
Value 85/100. Comet ML's pricing is quite generous, especially with a robust Free tier offering 100GB storage and core tracking.
Watch out: Overage fees for training hours on Pro tier
Spotlight by Backplanes
Understand, improve, and track your AI agent sessions
Strengths
- +Provides deep visibility into AI agent behavior that is otherwise invisible.
- +Helps optimize agent performance and identify cost-saving opportunities.
- +Offers tailored reports for different organizational roles (security, engineering, finance).
- +Free for individuals and teams, making it accessible.
- +Easy installation via a single command-line script.
Weaknesses
- -Supports specific AI agent platforms (Claude Code and Codex), limiting broader applicability.
- -Org-level features for attribution and specific controls require direct contact with the vendor for setup.
Key features
Pricing: Comet ML vs Spotlight by Backplanes
| Plan | Comet ML | Spotlight by Backplanes |
|---|---|---|
| Tier 1 | Free | N/A |
| Tier 2 | $19 month per user Pro | N/A |
| Tier 3 | custom Enterprise | N/A |
Pricing verified from each vendor's public pricing page. Compare in detail on Comet ML pricing and Spotlight by Backplanes pricing.
Who Should Use What?
On a budget?
Spotlight by Backplanes is free. Comet ML is paid.
Go with: Spotlight by Backplanes
Want the highest-rated option?
Comet ML is rated 4.3/5. Spotlight by Backplanes has no ratings yet.
Go with: Comet ML
Value user reviews?
Comet ML: 24 reviews (4.3/5). Spotlight by Backplanes: no ratings yet.
Go with: Comet ML
3 Questions to Help You Decide
What's your budget?
Comet ML is paid. Spotlight by Backplanes is free. Go with Spotlight by Backplanes if free matters most.
What's your use case?
Comet ML is a analytics tool. Spotlight by Backplanes is in AI agents. Pick the category that matches your needs.
How important are ratings?
Comet ML is rated 4.3/5; Spotlight by Backplanes has no ratings yet.
Key Takeaways
Comet ML
- Our pick for this comparison
Spotlight by Backplanes
- Completely free
- Better fit for AI agents
The Bottom Line
Comet ML is our pick. That said, Spotlight by Backplanes is free, hard to beat on price.
Frequently Asked Questions
Is Comet ML or Spotlight by Backplanes better?
Comet ML is rated in our evaluation. Comet ML is paid and Spotlight by Backplanes is free.
What are Comet ML and Spotlight by Backplanes used for?
Comet ML: Machine learning experiment tracking platform. Spotlight by Backplanes: Understand, improve, and track your AI agent sessions.
What does Comet ML cost vs Spotlight by Backplanes?
Comet ML is a paid tool. Spotlight by Backplanes is completely free. Visit their websites for detailed pricing.