Related Products
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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.
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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.
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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
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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
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Audience
Open-source LLM observability: log cost, latency, tokens, and agent traces for every OpenAI
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Audience
Teams whose code calls third-party APIs.
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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Support
Phone Support
Not Supported
24/7 Live Support
Not Supported
Online
Not Supported
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API
Offers API
Not Supported
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API
Offers API
Not Supported
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Screenshots and VideosNo images available
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Screenshots and Videos |
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Pricing
No information available.
Free Version
Not Supported
Free Trial
Not Supported
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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
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Reviews/
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Reviews/
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Training
Documentation
Not Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Training
Documentation
Supported
Webinars
Not Supported
Live Online
Not Supported
In Person
Not Supported
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Company InformationSpanlens
Founded: 2026
South Korea
spanlens.io
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Company InformationUpseam
upseam.dev/
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Alternatives |
Alternatives |
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Categories |
Categories |
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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
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Integrations
Anthropic
Supported
Claude Code
Supported
Codex CLI
Supported
Dependabot
Supported
GitHub
Supported
OpenAI
Supported
OpenCode
Supported
Slack
Supported
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