Lunary
Lunary provides an observability and evaluation platform for large language model applications.
Operating headquarters
San Francisco, CA, USFounded
2021Lunary provides an observability and evaluation platform for large language model applications.
lunary.aiCrawled Oct 2, 2026
Use Lunary to trace model and tool runs, inspect conversations and test prompt changes.
Enterprise-grade observability and prompt management platform for LLM applications.
Explore Lunary integrations by category and find the tools that work best with your AI workflows.
Use this tool below to understand how a piece of text might be tokenized by OpenAI models (gpt-5, gpt-5-mini, gpt-5-nano, gpt-4o, gpt-4.1) and the total count of tokens in that piece of text.
Use this tool below to understand how a piece of text might be tokenized by Anthropic models (Claude 1, Claude 2, Claude Instant, Claude 3) and the total count of tokens in that piece of text.
Latest updates, tutorials, and insights from the Lunary team.
Use this tool below to understand how a piece of text might be tokenized by DeepSeek models (DeepSeek-V3, DeepSeek-R1, DeepSeek-V3-Base) and the total count of tokens in that piece of text.
Compare LLM evaluation tools for datasets, baseline comparisons, human review and prompt testing.
Stay updated with the latest AI and LLM news - October 2026
Compare Lunary plans and choose the right observability tools for your AI product.
Discover other LLMOps and observability platforms and see how they compare to Lunary.
Explore Arize Phoenix alternatives for conversation review, managed prompts and evaluation workflows, with Lunary, Langfuse and Braintrust.
Compare Arize Phoenix and Langfuse for tracing, prompt management and evaluation, with Lunary for conversation review and user feedback.
Compare Braintrust alternatives for conversation debugging, open-source tracing and AI evaluations. See where Lunary fits your production workflow.
Book time with the Lunary team to see observability and prompt management in action.
Observability and prompt management platform for LLM-based apps. Take your LLMs to the next level.
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GitHubRepository owner
TrueFoundry describes an integration that sends standard OpenTelemetry traces from its AI Gateway to Lunary. The traces let users inspect prompts, token usage, latency, and agent workflows.
Jun 2026 · TrueFoundryNews article
Jimmy Song reports that Lunary’s GitHub repository returned a 404 while its website remained online. He uses the disappearance to comment on the stability of commercial open-source projects.
Dec 2025 · Jimmy SongNews article