PDFAITools
Vellum
AI product development platform for building and deploying LLM-powered features with prompt management and evaluation tools.
What is Vellum?
What is Vellum?
Vellum is an AI product development platform purpose-built for teams shipping LLM-powered features in production. It brings together prompt engineering, model evaluation, deployment, and monitoring in a single collaborative environment.
Core Platform Features
- Visual prompt editor with side-by-side model comparison
- Test datasets and automated evaluation harnesses
- One-click deployment of prompts to a hosted API
- Production monitoring with latency, cost, and quality tracking
- Workflow builder for chaining prompts, retrieval, and code
Designed for Product Teams
Vellum bridges the gap between technical and non-technical team members. Product managers can iterate on prompts in the visual editor while engineers handle integration through a clean API. This collaborative model significantly speeds up the iteration cycle for LLM features.
Key Features
Edit and test prompts with a rich UI supporting variables, few-shot examples, and chat templates.
Run the same prompt across multiple models side-by-side to pick the best option.
Build test datasets and run automated evals to catch regressions before deployment.
Deploy prompts to a production API endpoint with versioning and rollback.
Track cost, latency, and quality metrics for every deployed prompt in real time.
Who Uses Vellum?
Iterate on prompts collaboratively before shipping AI features to users.
Evaluate a new model against your test cases before switching from GPT-4 to a cheaper alternative.
Maintain versioned, reviewed prompts instead of hardcoding them in application code.
Monitor token spend and identify prompts that can be shortened or moved to smaller models.
Pros & Cons
✅ Pros
- End-to-end platform covering the full prompt lifecycle
- Excellent model comparison UI speeds up evaluation
- Non-engineers can iterate on prompts without touching code
- Clean API for integrating deployed prompts into any stack
- Responsive support team and active product development
❌ Cons
- Vendor lock-in on deployed prompt hosting
- Workflow builder is less mature than the prompt editor
- Pricing can add up for high-volume production usage
- Limited open-source/self-hosted option
Vellum Pricing
Starter
- 1 workspace
- 3 deployments
- Basic monitoring
- 1,000 API calls/mo
Growth
- Unlimited deployments
- Team collaboration
- Advanced evals
- 50,000 API calls/mo
Enterprise
- SSO & RBAC
- Custom contracts
- Dedicated support
- On-premise option
Vellum earns a 4.4/5 rating from our editorial team. Its generous free tier lets you explore core features before upgrading, making it a low-risk choice for individuals and teams. Standout strengths include end-to-end platform covering the full prompt lifecycle and excellent model comparison ui speeds up evaluation.
Get Started with Vellum →