Vellum
llm-observability
Build, evaluate, and deploy LLM apps and agents with confidence.
Pricing
Free plan
Rating
—
Votes
0
Head-to-head comparison
Vellum vs Helicone
Compare Vellum and Helicone side by side across pricing, features, ratings, pros, cons, best-fit use cases, and alternatives.
Helicone
llm-observability
Open-source LLM observability and AI gateway in one line of code.
Pricing
Free plan
Rating
—
Votes
0
Feature comparison
Feature
Vellum
Helicone
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
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
Helicone pros and cons
Extremely easy integration via a one-line base-URL swap
Open source under Apache 2.0 and free to self-host
Tiny Docker image that runs almost anywhere
Gateway features like caching, failover, and rate limiting cut cost and improve reliability
Product is in maintenance mode after the Mintlify acquisition, with no roadmap
Long-term hosted-service viability is uncertain and migration may be needed
Usage-based overages mean the Pro price is a floor, not a cap
Which one should you choose?
Best overall signal
Helicone
Selected using Toolglade popularity signals such as views and votes.
Best value signal
Vellum
Selected using free-plan availability and engagement signals.
Best for
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
Helicone
- quick LLM request logging
- self-hosted observability
- gateway caching and failover
- cost and usage monitoring
- Teams wanting simple, cheap LLM logging
FAQ
Is Vellum better than Helicone?
It depends on your use case. Compare category fit, pricing, feature availability, and ratings before choosing.
Which tool has a free plan?
Vellum and Helicone offer a free plan based on current Toolglade data.