kitio.aiWeights & Biases vs Langfuse
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Langfuse has the lower starting price: about $29 a month, against $60 for Weights & Biases.
At a glance
Best for
Category
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Experiment tracking
- Hyperparameter sweeps
- Model registry
- Weave LLM tracing
- Reports
- LLM tracing
- OpenTelemetry support
- Prompt management
- Evaluations and datasets
- Self-hosting
| Feature | Weights & Biases | Langfuse |
|---|---|---|
| Best for | Experiment tracking and LLM observability, now part of CoreWeave | Open-source LLM observability, prompt management and evals |
| Category | Models & APIs | Models & APIs |
| Pricing model | Freemium | Freemium |
| Starting price | $60/mo | $29/mo |
| Free plan | Yes | Yes |
| Made by | CoreWeave | ClickHouse |
| Based in | United States | United States |
| Rating | No ratings yet | No ratings yet |
| Key features |
|
|
Pricing compared
Langfuse has the lower starting price: about $29 a month, against $60 for Weights & Biases.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- Experiment tracking for individuals
- Limited storage
Pro
$60/mo
- Starting price
- Team collaboration features
- Higher usage limits
Enterprise
Contact sales
- SSO and advanced security
- Dedicated support
4 plans
Hobby
Free
- Free cloud plan
- Limited usage and history
Core
$29/mo
- 100k units included, $8/100k extra
- 90 days data access
- Unlimited users
Pro
$199/mo
- 3 years data access
- High rate limits
- SOC2 and ISO27001 reports
Enterprise
$2499/mo
- Audit logs and SCIM API
- Uptime and support SLA
- Named support engineer
Prices in USD, checked Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Weights & Biases
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
- Pricing jumps for larger teams
- Weave ingestion billed by size
- Sign-in moved to CoreWeave
Langfuse
- Free to self-host
- No seat-based fees
- Works with any framework
- Self-hosting needs ops work
- Advanced features on paid tiers
- UI can feel dense
Which one should you choose?
Choose Weights & Biases if you want:
- Industry-standard experiment tracking
- Polished dashboards
- Covers training and LLM apps
Watch out: pricing jumps for larger teams.
Choose Langfuse if you want:
- Free to self-host
- No seat-based fees
- Works with any framework
Watch out: self-hosting needs ops work.
Weights & Biases vs Langfuse FAQ
What is the difference between Weights & Biases and Langfuse?
Weights & Biases: Experiment tracking and LLM observability, now part of CoreWeave. Langfuse: Open-source LLM observability, prompt management and evals. Both are models & apis tools.
Is Weights & Biases or Langfuse cheaper?
Langfuse has the lower starting price: about $29 a month, against $60 for Weights & Biases.
Do Weights & Biases and Langfuse have free plans?
Weights & Biases: Yes. Langfuse: Yes.
Who makes Weights & Biases?
Weights & Biases is made by CoreWeave, based in United States.
Who makes Langfuse?
Langfuse is made by ClickHouse, based in United States.
Which should I choose, Weights & Biases or Langfuse?
Choose Weights & Biases if you value industry-standard experiment tracking and polished dashboards. Choose Langfuse if you value free to self-host and no seat-based fees.