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Purpose-Built SDK and GUI for AI Development

Vellum’s Workflows SDK is an expressive framework for defining AI systems with clarity and control. Bi-directionally sync edits with a purpose-built visual editor to rapidly develop, debug, and iterate on your AI workflows.
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BASH
pip install vellum-ai

An unmatched developer experience

The AI Building Blocks You Need
Use out-of-box Nodes for common AI operations: invoke Prompts, call Tools, perform RAG, and more.
Infinitely Customizable
Define your own custom Nodes using the same primitives used by Vellum's Nodes.
Self Documenting Syntax
An expressive, declarative syntax that self-documents the control flow of your graph.
Built-In Type Safety
Type-safe by design, warning you of potential errors before they manifest at runtime.
GUI
Code

Hot-reload with a UI for AI Development

Visualize Control Flow
Push the definition of your graph from code to UI via CLI to visualize the control flow of your system.
Simulate the Real World
Simulate the execution of real-world scenarios and quickly track down where things go wrong in a UI.
Sync Code ↔ UI
Unique to Vellum, make edits in the UI and pull those changes down via CLI to update your code.
Demo

Opinions Where You Want Them, Flexibility Where You Need It

Syntactic Sugar That’s Not Too Sweet
A simplified syntax that under-the-hood manages the orchestration of parallel branches, looping, and asynchronous behavior.
Power Without Boilerplate
Native support for streaming, at both the Workflow level and the Node level. Return incremental values as a final output, or stream results between Nodes in real time.
AI Without the Black Box
First-class support for loops with state snapshotting and state forking, allowing for full reproducibility of the complex cyclic behaviors found in most agentic systems.
Flexible Deployment Options
Host and run yourself, or deploy to Vellum with support for user-defined dockerized runtimes.

Workflows
SDK Features

Read the Docs
Nodes
The basic units of a graph, Nodes represent individual tasks or functions.
Graph Syntax
An intuitive, declarative syntax for defining the control flow of a graph.
Advanced Control Flow
Support for looping, conditionals, paralellism, state forking, and more.
Inputs and Outputs
Individual Nodes and Workflows can take in inputs and produce outputs, which can be used to pass information between other Nodes or Workflows.
State
Nodes read from and write to the graph’s global state, which can be used to share information between Nodes without defining explicit inputs and outputs.
Streaming
Nodes can stream output values back to the consumer, allowing for long-running tasks like chat completions to return partial results.
Human-In-The-Loop
Nodes can wait for External Inputs, allowing for a pause in the Workflow until a human or external system provides input.
UI Integration
Push and pull changes from code to Vellum’s UI and vice versa, allowing for rapid development, debugging, and iteration.

Our customers

Vellum made it so much easier to quickly validate AI ideas and focus on the ones that matter most. The product team can build POCs with little to no assistance within a week!
‍

Pratik Bhat
Sr. Product Engineer @ Drata

We sped up AI development by 50 percent and decoupled updates from releases with Vellum. This allowed us to fix errors instantly without worrying about infrastructure uptime or costs.
‍

Jordan Nemrow
Co-Founder & CTO @ Woflow

Vellum helped us quickly evaluate prompt designs and workflows, saving us hours of development. This gave us the confidence to launch our virtual assistant in 14 U.S. markets.
‍

Sebi Lozano
Sr. Product Manager @ Redfin
Read Our Case Studies

FAQ

How can Vellum help me with AI development

Vellum helps product and engineering teams build reliable AI applications and ship them to production in weeks not quarters. The platform has tooling for all pain points with AI development: experimentation, evaluation, deployment, monitoring and collaboration. With Vellum you can build AI features of any complexity and closely track inputs and outputs at each step of the process.

Is Vellum suitable for non technical users

We designed Vellum to facilitate collaboration between developers and non-technical team members. Our product suite allows product managers and subject matter experts to contribute to AI development without needing to write code.

How can Vellum help me with AI development

Vellum helps product and engineering teams build reliable AI applications and ship them to production in weeks not quarters. The platform has tooling for all pain points with AI development: experimentation, evaluation, deployment, monitoring and collaboration. With Vellum you can build AI features of any complexity and closely track inputs and outputs at each step of the process.

What developer tools does Vellum provide

Vellum helps product and engineering teams build reliable AI applications and ship them to production in weeks not quarters. The platform has tooling for all pain points with AI development: experimentation, evaluation, deployment, monitoring and collaboration. With Vellum you can build AI features of any complexity and closely track inputs and outputs at each step of the process.

How does Vellum integrate with other tools and Workflows

Vellum helps product and engineering teams build reliable AI applications and ship them to production in weeks not quarters. The platform has tooling for all pain points with AI development: experimentation, evaluation, deployment, monitoring and collaboration. With Vellum you can build AI features of any complexity and closely track inputs and outputs at each step of the process.

What developer tools does Vellum provide

Vellum helps product and engineering teams build reliable AI applications and ship them to production in weeks not quarters. The platform has tooling for all pain points with AI development: experimentation, evaluation, deployment, monitoring and collaboration. With Vellum you can build AI features of any complexity and closely track inputs and outputs at each step of the process.

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Our product and engineering teams are more in sync and efficient. With Vellum, they're able to validate and operationalize high-impact AI ideas much faster.

Lior Solomon
VP Data

Vellum has transformed our AI development process! What used to take weeks now takes hours, and the collaboration between our teams has never been smoother.

Eric Lee
Partner & CTO