LLMOps and observability
Lunary: review, pricing, data and alternatives
Lunary helps teams using models track calls, responses, costs, latency, and errors. It manages instruction versions, supports response evaluation through human feedback, and masks personal data. A free tier exists; the first paid plan costs $20 per month. Access and transparency score: 68/100, #9 of 18 in its category.
What is Lunary?
Lunary helps teams using models track calls, responses, costs, latency, and errors. It manages instruction versions, supports response evaluation through human feedback, and masks personal data.
According to its documentation, Lunary lets you:
- record model calls and responses
- track costs, latency, and errors
- manage instruction versions
- evaluate responses with human feedback
- mask personal data
We file it under LLMOps and observability, the category of tools to evaluate, monitor and debug AI apps, and it also overlaps with developer tools. The category lists 18 verified tools on this site.
The publisher is Lunary LLC, based in United States.
Who is it for?
It is mostly useful to these profiles: developers and data analysts. The need it covers is simple to state: evaluate, monitor and debug AI apps.
Lunary is a good candidate if:
- you want to try before paying
- you plan to connect it to your tools or automations through its API
- you must keep your data in Europe or on your own machine
Before deciding, run a trial on a real task and measure the time saved: it is the only criterion that really counts.
How much does Lunary cost?
Pricing model: paid. A free plan is offered, usually limited in volume or features.
The first paid plan costs $20 per month (Team, per user, billed monthly; overages billed separately. Free self-hosted community edition), according to the pricing page, checked on October 24, 2026.
Per month, that is cheaper than the category median ($49 per month, based on tools with a published price).
To estimate what the same work would cost done directly with an AI model, use our API price calculator. Prices change often: always check the official site before subscribing.
Data and privacy
According to its privacy policy, data is processed in the European Union.
Hosting in the European Union makes GDPR compliance easier, without exempting you from reading the terms of use.
Exporting your content: CSV, JSONL. Being able to get your data back makes switching tools easier later.
Three habits apply to every AI tool:
- turn off the use of your content for training if the option exists
- use a work account separate from your personal account
- review everything the tool produces before publishing or sending it
Platforms, languages and API
Lunary runs on: web browser and API.
Interface languages are not specified.
A public API lets you call it from your own programs or an automation tool, and plug it into an AI agent.
How we scored it
Our 68/100 score does not judge output quality: it measures what can be publicly verified about access to the tool, its openness and how far the publisher can be trusted.
| Criterion | Points | What counts |
|---|---|---|
| Access | 25/30 | free tier, published price, French interface |
| Openness | 20/30 | API, data export, open code |
| Trust | 23/40 | identified publisher, declared hosting, age, presence in reference lists |
The full calculation is explained on our method page.
Comparison with alternatives
Lunary against other tools in the lLMOps and observability category:
Verdict
Lunary is a decent option; compare its price and terms with the category leaders.
Strengths
- Free tier to try it
- Cheaper than its category median
- Public API
- Data hosted in the EU
Alternatives
Categories and jobs
Learn more
Frequently asked questions
Is Lunary free?
Yes, a free plan exists, with usage limits. The first paid plan costs $20 per month.
Where is Lunary data stored?
According to the publisher, in the European Union.
Does Lunary have an API?
Yes, a public API is documented.
What are the alternatives to Lunary?
In the same category: Langfuse, LangSmith, Opik, and Arize Phoenix.
Lunary or Langfuse: which one to choose?
Lunary starts at $20 per month, Langfuse at $29 per month and our score is 68/100 for Lunary and 95/100 for Langfuse. Try both on the same task before paying.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score