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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

Third-party APIs change while your code depends on them: a model ID is retired, a field is removed, or an API version reaches end of life. Dependabot updates package versions, but it does not tell you which lines call the changed API. Upseam does. It reads vendor changelogs and deprecation notices for Stripe, Shopify, OpenAI, Anthropic, and Gemini, matches them against JavaScript, TypeScript, and Python code, and identifies the affected lines. Then it opens a pull request with the fix. It never pushes to your default branch. In Ask mode (the default), you approve each fix before a pull request opens, including simple fixes such as a renamed model ID. Install the GitHub App or run a one-off local report with npx @upseam/cli inspect. The local report requires no account or installation. Upseam is free during the beta.

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

Teams whose code calls third-party APIs.

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 Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

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

Pricing

$0
Free during beta. Customers supply their own OpenAI or Anthropic model credentials; model usage charges are billed by the selected provider.
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

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

Review this Software

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

Company Information

Spanlens
Founded: 2026
South Korea
spanlens.io

Company Information

Upseam
upseam.dev/

Alternatives

Alternatives

Versionveil

Versionveil

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Serpent

Serpent

Tekunda
gitStream

gitStream

LinearB

Categories

AI Observability Supported

Categories

DevOps Supported

Integrations

Anthropic Not Supported
Claude Code Not Supported
Codex CLI Not Supported
Dependabot Not Supported
GitHub Not Supported
OpenAI Not Supported
OpenCode Not Supported
Slack Not Supported

Integrations

Anthropic Supported
Claude Code Supported
Codex CLI Supported
Dependabot Supported
GitHub Supported
OpenAI Supported
OpenCode Supported
Slack Supported
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