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About

Spanlens is an open-source (MIT) LLM observability platform that lets developers monitor every call their application makes to OpenAI, Anthropic, Gemini, Mistral, OpenRouter, Azure OpenAI, or a local Ollama model. Integration takes one line: swap your client's baseURL to the Spanlens proxy, or run "npx @spanlens/cli init" and the wizard rewrites your code automatically. From that moment, every request is recorded with its model, token counts, latency, cost, and full prompt and response body, with streaming responses reconstructed automatically. The dashboard turns that raw log into operational insight. Cost tracking breaks spend down per request, per model, and per end user, and parses prompt-cache tokens separately so you see real cache savings rather than sticker price. Agent tracing visualizes multi-step workflows as Gantt waterfalls and node-and-edge graphs, highlighting the critical path so you can find the slowest dependency chain in a fan-out.

About

telemetry.dev is an OpenTelemetry-native observability platform for AI agents and LLM applications. Developers can trace model calls, tool steps, retrievals, logs, and metrics; inspect failures, latency, token usage, and estimated cost; and compare activity by model, provider, and environment. It supports first-party TypeScript and Python SDKs, provider and framework integrations, and standard OTLP/HTTP ingest. Environment-level capture controls, SDK masking, and server-side redaction help teams manage stored prompt, response, and telemetry content.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Open-source LLM observability: log cost, latency, tokens, and agent traces for every OpenAI

Audience

Developers and engineering teams building, operating, and debugging AI agents and LLM applications.

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Not Supported

API

Offers API Not Supported

API

Offers API Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Pricing

$0/month
Prices are per organization per month. Free includes 30,000 ingestion units per month, 14-day retention, 1 project, and 2 seats. Pro is $25 per month with 500,000 ingestion units, 30-day retention, 5 projects, and 5 seats. Team is $50 per month with 2 million ingestion units, 90-day retention, unlimited projects and seats, and priority support. One normalized span, OTLP log record, or metric data point counts as one ingestion unit. Paid ingestion continues beyond the listed allowances without automatic overage charges; the vendor may contact consistently high-usage customers.
Free Version Supported
Free Trial Not Supported

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Not Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Spanlens
Founded: 2026
South Korea
spanlens.io

Company Information

telemetry.dev
telemetry.dev/

Alternatives

Alternatives

Arize Phoenix

Arize Phoenix

Arize AI
Grafana Cloud

Grafana Cloud

Grafana Labs

Categories

AI Observability Supported

Categories

Integrations

Amazon Bedrock Not Supported
Anthropic Not Supported
Claude Code Not Supported
CrewAI Not Supported
Cursor Not Supported
LangChain Not Supported
LiteLLM Not Supported
Model Context Protocol (MCP) Not Supported
OpenAI Not Supported
OpenCode Not Supported
OpenRouter Not Supported
OpenTelemetry Not Supported
PydanticAI Not Supported
Vercel AI SDK Not Supported

Integrations

Amazon Bedrock Supported
Anthropic Supported
Claude Code Supported
CrewAI Supported
Cursor Supported
LangChain Supported
LiteLLM Supported
Model Context Protocol (MCP) Supported
OpenAI Supported
OpenCode Supported
OpenRouter Supported
OpenTelemetry Supported
PydanticAI Supported
Vercel AI SDK Supported
Claim Spanlens and update features and information
Claim Spanlens and update features and information
Claim telemetry.dev and update features and information
Claim telemetry.dev and update features and information