What is the main difference between Arize Phoenix and Spanlens?

Arize Phoenix and Spanlens are both llm observability & evaluation 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: Arize Phoenix or Spanlens?

The choice between Arize Phoenix 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 Arize Phoenix to Spanlens?

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

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Arize Phoenix vs Spanlens

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

Arize Phoenix

Open-source platform for LLM tracing, evaluation, and optimization. Features automatic instrumentation, prompt playground, and real-time AI application monitoring.

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11,113stars+471(+4.4%)

Last 30 days

Last commit
6 hours ago
Repository age
4 years
Version
v20.3.0
License
Elastic-2.0
Self-hosted
Yes
Repository
arize-ai/phoenix

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 Read more

12stars

Last 30 days

Last commit
18 hours ago
Repository age
4 months
License
MIT
Self-hosted
Yes
Repository
spanlens/spanlens

Detailed Comparison

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

Arize Phoenix wins

Community & Popularity

Arize Phoenix significantly outpaces Spanlens in community adoption with 11,113 stars compared to 12 stars on GitHub. This 926.1x difference suggests Arize Phoenix has a much larger and more active community. In terms of developer contributions, Arize Phoenix has 1,067 forks, indicating strong developer engagement.

Comparable

Development Activity

Both projects show recent activity, with Arize Phoenix last updated 6 hours ago and Spanlens 18 hours ago.

Comparable

Technology Stack

Both tools share common technology foundations, being built with JavaScript, CSS, Bash, Typescript, JSX, Python. However, they differ in their additional technology choices: Spanlens leverages Next.js.

Arize Phoenix wins

Project Maturity

Arize Phoenix has been in development longer, starting 4 years ago, compared to Spanlens which began 4 months ago. This 3.5-year head start suggests Arize Phoenix may have more mature features and established processes.

Spanlens wins

Licensing

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

Comparable