Agentic Index
Langfuse vs W&B Weave (2026)
Both trace, evaluate and monitor agents, at 7.5 and 7 of 14, and the ecosystem question decides most of these. That verdict is the Agentic Index coverage score, graded from each vendor's own published materials.
Langfuse is open source and self hostable with tracing, prompt management and evaluation, free for 50,000 units monthly then 29 dollars. Weave comes from Weights and Biases with session aware tracing, LLM as a judge scoring and safety scorers, free tier then about 60 dollars monthly plus usage meters. If your team already runs Weights and Biases for model training, Weave is the shorter path; if not, Langfuse is cheaper and yours to host.
This comparison is published by Agentic Index, an independent agentic AI vendor research platform. Langfuse and W&B Weave are each graded against the same 14 capability Agentic Index taxonomy, from the vendor's own public materials under the Agentic Index verification standard, alongside 969 researched vendors. No vendor pays for placement and no vendor has reviewed this page. How this evidence is graded
Choose Langfuse if
- Documented coverage is slightly broader and open source self hosting is a requirement.
- Prompt management alongside tracing is the combination you need.
- Twenty nine dollars against sixty plus usage meters is a real difference at team scale.
Choose W&B Weave if
- Your team already runs Weights and Biases, which makes this continuous with existing practice.
- Safety scorers alongside quality evaluation is the coverage you want.
- Session aware tracing matches how your agents actually run.
| At a glance | Langfuse | W&B Weave |
|---|---|---|
| Category | Agent infrastructure | Agent infrastructure |
| Entry price | Free Hobby (50K units/mo) · Core $29/mo · open source self host | Free tier; Pro about $60/mo plus usage meters; Enterprise custom |
| Free / trial | Free Hobby plan, no card (50K units/mo, 2 users) | Free tier plus free Pro for academics; free trial to estimate ingestion |
| Pricing confidence | public exact | public partial |
| Feature | L Langfuse |
W W&B Weave |
|---|---|---|
| Action & orchestration | ||
|
Integrations & Tool Calling Ability to connect agents to real systems through native integrations, OAuth-authenticated actions, custom tools, APIs, webhooks, or MCP-compatible tools. |
Full / Explicit | Full / Explicit |
|
Workflow Orchestration Ability to sequence, branch, retry, route, and combine deterministic workflow nodes with autonomous agent steps. |
No / Not documented | No / Not documented |
|
Triggers & Channel Coverage How agents wake up and where they work: schedules, webhooks, message events, CRM events, inbox events, chat, email, voice, and collaboration tools. |
No / Not documented | No / Not documented |
| Knowledge & context | ||
|
Knowledge Grounding & RAG Ability to ground agent behavior in company data through document ingestion, retrieval, external knowledge APIs, semantic search, or RAG layers. |
No / Not documented | No / Not documented |
|
Memory & State Persistence Ability to persist context across a run, conversation, workflow, user, team, or longer-term memory layer. |
No / Not documented | No / Not documented |
| Control & trust | ||
|
Human Oversight & Guardrails Approval steps, consent checkpoints, escalation rules, structured guardrails, policy constraints, and pause/resume controls. |
Full / Explicit | Partial |
|
Security, Identity & Governance RBAC, SSO, auditability, encryption, least-privilege tool access, compliance posture, and data handling policy. |
Partial | Full / Explicit |
|
Observability & Auditability Traces, logs, execution histories, metrics, audit events, and debugging detail for production agent behavior. |
Full / Explicit | Full / Explicit |
|
Deployment & Data Residency Deployment modes and options, including SaaS, dedicated cloud, VPC, on-prem, hybrid, local runtime, and self-hosting. |
Full / Explicit | Full / Explicit |
| Solution readiness | ||
|
Prebuilt Agents, Templates & Packs Ready-made workflows, packaged employees, templates, blueprints, industry solutions, and role-specific agents that reduce time-to-value. |
No / Not documented | No / Not documented |
| Platform extensibility | ||
|
Model Flexibility & Routing Ability to work across multiple foundation models, route tasks to different models, or let buyers bring their own providers and keys. |
Full / Explicit | Partial |
|
APIs, SDKs & MCP Extensibility Composability layer: stable APIs, SDKs, MCP tool consumption/serving, custom tools, and integration into internal systems. |
Full / Explicit | Full / Explicit |
|
Testing, Debugging & Optimization Testing, debugging, scoring, retries, fallbacks, quality gates, and optimization loops for improving agent workflows before and after deployment. |
Full / Explicit | Full / Explicit |
| Specialist automation | ||
|
Browser & Computer Use Browser, desktop, or remote/local computer control for workflows that cannot be handled through stable APIs alone. |
No / Not documented | No / Not documented |
Pricing snapshot
Sourced from the Index pricing dataset · open each vendor's profile for full detail.
| Pricing | L Langfuse |
W W&B Weave |
|---|---|---|
|
Entry price Lowest public entry point |
Free Hobby (50K units/mo) · Core $29/mo · open source self host | Free tier; Pro about $60/mo plus usage meters; Enterprise custom |
|
Pricing confidence How public the numbers are |
Public, exact | Public, partial |
|
Billing Primary billing axis |
usage | usage meters (storage, ingestion) plus tier |
|
Variable cost Workload / overage exposure |
Medium variable cost | Medium variable cost |
|
Free tier / trial Try before you buy |
Free tier
|
Free tierTrial
|
|
Buying motion Self-serve vs sales call |
Self-serve | Mixed |
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