Lunary
llm-observability
Open-source LLM observability and prompt management for chatbots and RAG
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Lunary vs Vellum
Compare Lunary and Vellum side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
Vellum
llm-observability
Build, evaluate, and deploy LLM apps and agents with confidence.
Pricing
Free plan
Rating
—
Votes
0
Feature comparison
Feature
Lunary
Vellum
Category
llm-observability
llm-observability
Pricing
Free plan
Free plan
Free plan
API access
Mobile app
Browser extension
Team collaboration
Custom training
Self-hosted option
Offline mode
Multi-language support
Lunary pros and cons
Open source under Apache 2.0
Self-hostable with no per-event cost
Lightweight and fast to set up
Model-agnostic with LangChain and OpenAI support
Free cloud tier capped at limited daily events
Lighter feature set than enterprise LLMOps suites
Smaller team and community than larger platforms
Vellum pros and cons
Combines prompt, workflow, evaluation, and deployment in one platform
Visual workflow builder lowers the barrier for cross-functional collaborators
Solid evaluation and testing tooling for pre-production quality gates
Multi-provider model support avoids lock-in
Pricing is opaque and sales-led, making budgeting hard
Not open source, and self-hosting is locked to Enterprise
Free tier is quite limited in credits, documents, and seats
Which one should you choose?
Best overall signal
Vellum
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Lunary
Selected using free-plan availability and engagement signals.
Best for
Lunary
- chatbot observability
- RAG monitoring
- open-source LLMOps
- Chatbot and RAG builders
- Teams wanting open-source observability
Vellum
- collaborative agent building
- prompt evaluation and testing
- deploying LLM features
- cross-functional AI teams
- Teams wanting an all-in-one build-evaluate-deploy platform
FAQ
Is Lunary better than Vellum?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Lunary and Vellum offer a free plan based on current Toolglade data.