Free
Free
Site describes Lookspan as free and open source (MIT) with no cloud account or API keys required.
- Access
- Site describes Lookspan as free and open source (MIT) with no cloud account or API keys required.
Finding the possibilities
Lookspan
● Identity checkedAssistant · Vendor site 2026-10-04
Lookspan is a local-first observability tool for AI agents that records LLM calls, MCP tool spans, and per-trace costs, exposing a dashboard on localhost via npx lookspan without sending telemetry to the cloud.
- Category
- Assistant
- Free access
- Site describes Lookspan as free and open source (MIT) with no cloud account or API keys required.
- API access
- OpenTelemetry OTLP traces can be sent to a local /v1/traces receiver according to the homepage.
Is Lookspan right for you?
A good fit for
Engineers debugging LangGraph, CrewAI, MCP, or custom agents who need waterfall traces and cost breakdowns entirely on their machine.
Before you choose
Traces stay in a local SQLite database under ~/.lookspan, so collaboration requires exporting data manually.
Agent traces without the cloud
Lookspan streams live spans over SSE, maps OpenTelemetry gen_ai fields, and surfaces cost_usd per trace so you can diagnose failing agent runs locally.
What it can do
Features & capabilities
Unknown is different from unavailable. Each fact carries its own evidence.
| Capability | Value | Evidence | Checked |
|---|---|---|---|
| Local dashboard | Homepage instructs running npx lookspan to serve a dashboard at http://127.0.0.1:3100. | Facts sourced | 2026-10-04 |
| MCP native | Site highlights @lookspan/mcp instrumentation with one span per MCP tool call. | Facts sourced | 2026-10-04 |
| Storage | Marketing copy stores traces in SQLite at ~/.lookspan/lookspan.db on your disk. | Facts sourced | 2026-10-04 |
Understand the total cost
Lookspan pricing & plans
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Frequently asked questions
What is Lookspan used for?
Lookspan is a local-first observability tool for AI agents that records LLM calls, MCP tool spans, and per-trace costs, exposing a dashboard on localhost via npx lookspan without sending telemetry to the cloud.
Does Lookspan have a free plan?
Site describes Lookspan as free and open source (MIT) with no cloud account or API keys required.. This record lists ongoing free access; check the plan limits before starting.
How much does Lookspan cost?
No paid monthly price is listed; this record treats the product as free to start. See the plan cards for entitlements, billing commitments and seat minimums.
Can I use Lookspan through an API?
OpenTelemetry OTLP traces can be sent to a local /v1/traces receiver according to the homepage.. API access and subscription access may have different terms; consult the linked sources.
What should I check before choosing it?
Traces stay in a local SQLite database under ~/.lookspan, so collaboration requires exporting data manually.
Price history
No retained pricing changes yet. A current price alone does not establish a historical trend.
How this profile is supported
Identity and profile
Reviewed vendor source
Read original source ↗Facts apply to the named version and check date. Send a sourced correction if something changed.