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Software Development · head to head

Langfuse vs Langwatch

Langfuse logo

Langfuse

Software Development

Simple pricing for projects of all sizes

From
Free
Rated
-
Full reviewWebsite
Langwatch logo

Langwatch

Machine Learning

LLM engineering platform for testing and evaluating AI agents in production

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Langfuse free Hobby plan limited to 2 users and 30-day data retention; Langwatch free plan limited to 50k events per month, restricting larger deployments

Where they differ

Only the attributes on which Langfuse and Langwatch actually diverge.

Attributes where Langfuse and Langwatch differ
AttributeLangfuseLangwatch
Pricing modelfreemiumTiered subscription with usage-based overage charges
PlatformsWebWeb, Docker, Kubernetes
CategorySoftware DevelopmentMachine Learning

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 Langfuse

Nothing recorded that Langwatch does not also cover.

Only in Langwatch

  • Agent simulation testing
  • LLM evaluation
  • OpenTelemetry tracing
  • Langy AI Engineer
  • Governance controls
  • Multiple deployment options
  • Framework support

What people use each for

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

Langfuse

No use cases recorded yet. See the Langfuse review.

Langwatch

  • Continuous testing of AI agents before production deploymentnot Langfuse
  • Automated test creation from product requirementsnot Langfuse
  • LLM response quality evaluation and scoringnot Langfuse
  • Production agent monitoring and cost trackingnot Langfuse
  • Governance and access control for AI systemsnot Langfuse

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Langfuse

  • Free Hobby plan limited to 2 users and 30-day data retention
  • Overage pricing applies beyond included units; graduated rates from $8.00 per 100k units down to $6.00 per 100k units at 50M+ volume

Langwatch

  • Free plan limited to 50k events per month, restricting larger deployments
  • Pricing in EUR may complicate budgeting for US-based teams
  • Usage-based overage model can create unpredictable costs
  • Self-hosted option requires DevOps expertise

Pricing, plan by plan

Langfuse

Free
  • HobbyFree
    • 50k units/month
    • 30-day data retention
    • 2 users maximum
  • Core$29/month
    • 100k units/month
    • 90-day data retention
    • Unlimited users
  • Pro$199/month
    • 100k units/month
    • 3-year data retention
    • SOC2 & ISO27001 compliance
  • Enterprise$2499/month
    • Custom rate limits
    • Dedicated support engineer
    • SCIM API & audit logs

Langwatch

Free
  • DeveloperFree
    • 50k events per month
    • 14-day data access
    • 2 users
  • Growth$29/month
    • 200k events per month included
    • 5 EUR per 100k additional events
    • 30-day data retention
  • Enterprise$undefined/custom
    • Custom event limits
    • Hybrid, self-hosted or on-premises deployment
    • Custom SSO and RBAC

Which should you pick?

Choose Langfuse if

  • You want to start without paying.
Langfuse review

Choose Langwatch if

  • You need agent simulation testing.
  • You want to start without paying.
  • You work on Web, Docker, Kubernetes.
  • You also want llm evaluation.
Langwatch review

Questions people ask

Is Langfuse or Langwatch better?
Neither clearly leads. Langfuse starts at Free and Langwatch at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Langfuse or Langwatch?
Langfuse starts at Free and Langwatch at Free.
Does Langfuse or Langwatch run on more platforms?
Langfuse runs on Web. Langwatch runs on Web, Docker, Kubernetes.
Can I use Langfuse for free?
Both have a free tier, so you can try either at no cost before committing.
What can Langfuse do that Langwatch cannot?
Langwatch covers Agent simulation testing, LLM evaluation, OpenTelemetry tracing, Langy AI Engineer.

Answered from the vendors’ own pages

Langfuse: What does Langfuse cost?

Langfuse starts at $29/month for the Core plan (100k units/month). Pro costs $199/month with 3-year data retention. Enterprise costs $2499/month for custom rate limits and dedicated support.

Source
Langwatch: Is there a permanent free tier?

Yes, Langwatch's Developer plan is free forever with 50k events per month, 14-day data access, 2 users, and no credit card required. It is specifically designed for individual developers prototyping AI applications.

Source
Langfuse: Does Langfuse have a free plan?

Yes, the Hobby plan is free with 50k units/month, 30-day data retention, and support for up to 2 users.

Source
Langwatch: What is Langy and how does it save time?

Langy is an AI-powered tool that automates test creation. It converts product requirements into test scenarios, runs simulations, scores results, and generates pull requests with fixes in a median of 14 minutes.

Source
Langfuse: What happens if I exceed my unit limits on Langfuse?

Overage pricing applies with graduated rates: $8.00 per 100k units for 100k-1M units, $7.00 per 100k units for 1M-10M units, $6.50 per 100k units for 10M-50M units, and $6.00 per 100k units for 50M+ units.

Source
Langwatch: What frameworks does Langwatch support?

Langwatch works with LangGraph, LangChain, CrewAI, OpenAI Agents, AWS Bedrock, Azure OpenAI, Vertex AI, and other major LLM frameworks and platforms.

Source
Langfuse: Are there discounts available on Langfuse?

Early-stage startups receive 50% off the first year. Research and student accounts qualify for up to 100% off. Non-profits receive $199 monthly credits.

Source
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