What is the main difference between OpenLLMetry and Spanlens?

OpenLLMetry and Spanlens are both llm observability & evaluation tools but differ in their approach, features, and target audience. Compare their GitHub stats, technology stack, and community adoption to make the best choice.

Which is better: OpenLLMetry or Spanlens?

The choice between OpenLLMetry and Spanlens depends on your specific needs, technical requirements, and team preferences. Both are quality open source solutions with active communities.

Can I migrate from OpenLLMetry to Spanlens?

Migration between OpenLLMetry and Spanlens is possible but requires careful planning. Consider data export/import capabilities, feature parity, and potential workflow changes.

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OpenLLMetry vs Spanlens

Learn how OpenLLMetry and Spanlens differ in their key features, development activity, technology stack and community adoption, so you can decide which of these llm observability & evaluation tools is best for you.

OpenLLMetry

Open-source observability platform for LLMs using OpenTelemetry. Monitor performance, track costs, and debug AI applications with just 2 lines of code.

Visit OpenLLMetry

Spanlens

Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.

Visit Spanlens

Detailed Comparison

Both OpenLLMetry and Spanlens have their unique strengths and serve similar purposes effectively. Consider your specific needs regarding popularity, activity, maturity, licensing and features when making your decision.

OpenLLMetry wins

Community & Popularity

OpenLLMetry significantly outpaces Spanlens in community adoption with 7,340 stars compared to 10 stars on GitHub. This 734.0x difference suggests OpenLLMetry has a much larger and more active community. In terms of developer contributions, OpenLLMetry has 1,035 forks, indicating strong developer engagement.

Comparable

Development Activity

Both projects show recent activity, with OpenLLMetry last updated 17 days ago and Spanlens 14 hours ago.

OpenLLMetry wins

Project Maturity

OpenLLMetry has been in development longer, starting 3 years ago, compared to Spanlens which began 3 months ago. This 2.7-year head start suggests OpenLLMetry may have more mature features and established processes.

Spanlens wins

Licensing

Spanlens uses the MIT license, which is more permissive than OpenLLMetry's Apache-2.0 license, potentially offering greater flexibility for commercial use and integration.

Comparable

Use Cases & Features

Both tools serve similar use cases in LLM Observability & Evaluation.

Spanlens wins

Hosting & Deployment

Spanlens provides self-hosting options for complete data control and customization, while OpenLLMetry may be primarily cloud-based or require different deployment approaches.

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OpenLLMetry vs Spanlens: A Detailed Comparison of LLM Observability & Evaluation Tools in 2026

OpenLLMetry vs Spanlens

Learn how OpenLLMetry and Spanlens differ in their key features, development activity, technology stack and community adoption, so you can decide which of these llm observability & evaluation tools is best for you.

OpenLLMetry

Open-source observability platform for LLMs using OpenTelemetry. Monitor performance, track costs, and debug AI applications with just 2 lines of code.

Visit OpenLLMetry

Spanlens

Drop-in observability platform for OpenAI, Anthropic, and Gemini that logs every request, tracks costs, traces agent workflows, and flags anomalies and PII.

Visit Spanlens

Detailed Comparison

Both OpenLLMetry and Spanlens have their unique strengths and serve similar purposes effectively. Consider your specific needs regarding popularity, activity, maturity, licensing and features when making your decision.

OpenLLMetry wins

Community & Popularity

Comparable

Development Activity

Both projects show recent activity, with OpenLLMetry last updated 17 days ago and Spanlens 14 hours ago.

OpenLLMetry wins

Project Maturity

Spanlens wins

Licensing

Spanlens uses the MIT license, which is more permissive than OpenLLMetry's Apache-2.0 license, potentially offering greater flexibility for commercial use and integration.

Comparable

Use Cases & Features

Both tools serve similar use cases in LLM Observability & Evaluation.

Spanlens wins

Hosting & Deployment

Spanlens provides self-hosting options for complete data control and customization, while OpenLLMetry may be primarily cloud-based or require different deployment approaches.

Other tool comparisons to consider