Heym

AI-Native Workflow Automation

Build, visualize, and run intelligent AI workflows — without writing code.
Drag-and-drop canvas · LLM & Agent nodes · RAG pipelines · Multi-agent orchestration · MCP support

heym.run

What Is Heym?

Heym is an AI-native automation platform built from the ground up around LLMs, agents, and intelligent tooling. Wire together AI agents, vector stores, web scrapers, HTTP calls, and message queues on a visual canvas — then deploy instantly via Docker.

Unlike platforms that started as classic trigger-action automation and layered AI on later, in Heym AI is the execution model.

Explore the product site at heym.run.

📸 Screenshots

Login — Animated workflow canvas in the background	Dashboard — Manage workflows, credentials, vector stores, and teams
Workflow Canvas — Nodes connected and selected, with the properties panel open	Node Config — LLM node with model, prompt, and expression fields

✨ Key Capabilities

• Visual Workflow Editor — Drag-and-drop canvas powered by Vue Flow with 30+ node types
• AI Assistant — Describe what you want in natural language (or voice) and the assistant generates and wires nodes on the canvas automatically
• Chat with Docs — Ask context-aware questions directly from the documentation header while the current article path is prioritized in the prompt
• AI Skill Builder — Create new Agent skills or revise existing ones from a modal chat with live SKILL.md and Python file previews
• LLM & Agent Nodes — First-class LLM node and a full Agent node with tool calling, Python tools, MCP connections, skills, optional persistent memory (per-node knowledge graph with background extraction), and LLM Batch API mode with live status branches for supported providers
• Multi-Agent Orchestration — One agent orchestrates named sub-agents and sub-workflows, all wired visually
• Human-in-the-Loop (HITL) — Pause agent execution to request user approval or input before proceeding
• Guardrails — Content filtering, NSFW protection, and multilingual safety checks on LLM and Agent nodes
• Built-In RAG — Insert documents and run semantic search against managed QDrant vector stores in two nodes
• MCP Support — Connect Agent nodes to any MCP server as a client; expose your workflows as an MCP server for Claude, Cursor, and other clients
• Portal — Turn any workflow into a public chat UI at /chat/{slug} with streaming responses and file uploads
• Webhook SSE Streaming — Generate ready-to-run cURL commands for /execute or /execute/stream, with per-node start messages and live node event output in the terminal
• Data Tables — Manage structured data directly in the dashboard and reference it from workflows
• Templates — Start from pre-built workflow templates to get up and running quickly
• Parallel Execution — Independent nodes run concurrently based on the graph structure, no configuration needed
• Auto Heal — Playwright selectors break? AI automatically detects and fixes them at runtime
• LLM Fallback — Automatic model fallback when the primary LLM fails or is unavailable
• Reasoning Support — Configure reasoning effort and temperature per Agent node for fine-grained control
• Command Palette — Ctrl+K for instant search, navigation, and workflow actions
• Evals — Define test suites and run them against any workflow with one click
• LLM Traces — Full observability for every agent call: requests, responses, tool calls, and timing
• Self-Hosted — Your data, your infrastructure

Full Feature Set

For a complete list of all features with short descriptions, see Full Feature Set. It covers Getting Started, every node type, reference topics (Expression DSL, workflow structure, webhooks, SSE streaming, AI Assistant, Chat with Docs, Portal, security, etc.), and all dashboard tabs (Workflows, Templates, Variables, Chat, Credentials, Vectorstores, MCP, Traces, Analytics, Evals, Teams, Logs and more).

🎯 Why Heym?

1. Zapier Agents support "Knowledge Sources" (upload docs, connect apps) but no user-exposed vector store or control over embeddings/chunking
2. Make.com has Pinecone and Qdrant modules but no native one-click RAG node — you assemble the pipeline manually
3. n8n's AI Workflow Builder is cloud-only beta with monthly credit caps, not available for self-hosted
4. n8n shows intermediate steps (tool calls, results) but full prompt/response tracing requires third-party tools like Langfuse
5. n8n pauses AI tool calls for review through chat, email, and collaboration channels, but it is centered on tool approval rather than snapshotting and editing the whole execution state
6. Zapier Human in the Loop supports approvals and data collection inside Zaps, but it doesn't resume from a captured agent/runtime snapshot the way Heym checkpoints do
7. Make Human in the Loop is available as an Enterprise app with review requests and adjusted/approved/canceled outcomes, but it is plan-limited and less tightly coupled to agent state
8. n8n ships a dedicated Guardrails node, Zapier ships AI Guardrails across its AI products, and Make documents agent rules plus review flows but not a comparable standalone guardrails feature, so Make is marked limited
9. n8n executes sequentially by default; parallel execution requires sub-workflow workarounds
10. n8n uses the Sustainable Use License — free to self-host for internal use, commercial redistribution restricted
11. First-class per-agent knowledge graph with prompt injection and post-run LLM merge is uncommon; other platforms typically rely on external vector DB or manual memory patterns, hence limited
12. n8n's official docs cover HTTP Webhook and HTTP Request nodes plus Code/custom/community extensibility, but I couldn't find a first-party WebSocket trigger/send node, so n8n is marked limited
13. Zapier's official docs cover inbound webhooks and outbound webhook/API requests over HTTP only, not native WebSocket trigger or send steps
14. Make's official docs cover Webhooks modules and HTTP(S) request modules, but I couldn't find a native WebSocket trigger or send module
15. As of April 22, 2026, n8n's official docs document HTTP batching and loop/wait patterns rather than a native LLM batch-status branch, Zapier's official ChatGPT app docs list no triggers and only a generic API Request beta, and Make's official OpenAI integration page exposes batch actions like create/watch completed but not a first-class status-branching LLM node, so n8n/Make are marked partial and Zapier is marked unavailable for this specific pattern

🚀 Quick Start

git clone https://github.com/heymrun/heym.git
cd heym
cp .env.example .env
./run.sh

# OR — with .env file
git clone https://github.com/heymrun/heym.git
cd heym
cp .env.example .env
docker run --env-file .env -p 4017:4017 ghcr.io/heymrun/heym:latest

# OR — minimal, no .env file
docker run \
  -e ENCRYPTION_KEY=$(python3 -c "import secrets; print(secrets.token_hex(32))") \
  -e SECRET_KEY=$(python3 -c "import secrets; print(secrets.token_hex(32))") \
  -e DATABASE_URL=postgresql+asyncpg://postgres:[email protected]:6543/heym \
  -p 4017:4017 ghcr.io/heymrun/heym:latest

Open the editor in your browser at port 4017 in either setup.

cp .env.example .env
./deploy.sh              # Build and deploy all services
./deploy.sh --down       # Stop services
./deploy.sh --logs       # View logs
./deploy.sh --restart    # Restart services

Set ALLOW_REGISTER=false in .env to lock down registration in production.

🗺️ Platform Overview

🧩 Node Library

30+ nodes across six categories:

🧠 AI-Native Features

AI Assistant

Describe what you want in plain text or via voice — the assistant generates nodes and edges and applies them to the canvas instantly. No other automation platform ships a natural-language workflow builder that works directly inside the editor.

When a workflow already contains Agent skills, the assistant sends only each skill's SKILL.md into the builder context. Large .py files and binary attachments stay out of the prompt so workflow editing remains reliable even with complex skills loaded on the canvas.

AI Skill Builder

Inside the Agent node's Skills section, use AI Build to create a new skill or the inline sparkle action to revise an existing one. The modal streams a chat conversation, previews generated SKILL.md and .py files live, and saves them back through the same ZIP ingestion path used by manual skill uploads.

Multi-Agent Orchestration

Build orchestrator/sub-agent pipelines visually. One agent delegates tasks to named sub-agents or sub-workflows — composing complex behavior without custom orchestration code. Configure reasoning effort and temperature per agent for fine-grained control.

Human-in-the-Loop (HITL)

Pause agent execution at any point to request user approval, clarification, or input before proceeding. Build workflows where AI proposes and humans decide — combining automation speed with human judgment.

n8n, Zapier, and Make now offer native review or approval flows too. Heym's edge is agent-directed checkpoints with public review URLs, edit-and-continue, and full execution-state resume.

Guardrails

Apply content filtering, NSFW protection, and multilingual safety checks on LLM and Agent node outputs. Define rules in the node configuration — unsafe responses are caught before reaching downstream nodes.

n8n and Zapier now ship native AI safety tooling as well. Heym's edge is that guardrails live directly on the LLM and Agent nodes, support multilingual policy checks, and flow naturally into the workflow's existing error-handling paths.

MCP (Model Context Protocol)

As a client: Agent nodes connect to any external MCP server and gain all its tools automatically.
As a server: Your Heym workflows are exposed as an MCP server at /api/mcp/sse — callable from Claude Desktop, Cursor, or any MCP client.

Skills System

Skills are portable capability bundles — a SKILL.md instruction file plus optional Python tools. Drop a .zip or .md onto an Agent node, or use AI Build to draft and iterate on skills from chat. Reuse and share across workflows and teams.

Built-In RAG Pipeline

Upload PDFs, Markdown, CSV, or JSON to a managed vector store. Then wire a RAG node into any workflow for semantic search — results flow directly into your LLM or Agent node.

Input → RAG (search) → LLM (answer with context) → Output

Auto Heal

Playwright browser automation nodes detect broken selectors at runtime and use AI to automatically find the correct replacement — no manual maintenance when the target page changes.

Parallel Execution

Independent nodes run concurrently based on the graph structure. Use the Merge node to synchronize parallel branches. No configuration needed — the graph defines the execution order.

🔍 Observability

LLM Traces

Full visibility into every agent call: request and response payloads, tool call names and results, per-call timing, and skills passed to the model.

Evals

Define test cases with expected outputs. Run the entire suite with one click. Review pass/fail, actual vs expected, and historical run data. Ship AI workflows with confidence.

💬 Portal

Turn any workflow into a public chat interface at /chat/{slug}. Optional per-user authentication, streaming responses, file uploads, and multi-turn conversation history. Ship internal tools and customer-facing chatbots — no frontend code required.

📝 Expression DSL

Reference and transform data between nodes with a clean syntax:

$input.text                         // Trigger input
$nodeName.field                     // Any upstream node output
$global.variableName                // Persistent global variable
$now.format("YYYY-MM-DD HH:mm")    // Date/time formatting
$UUID                               // Random unique ID
$range(1, 10)                       // Generate number range
$input.items.filter("item.active")  // Array filtering
$input.users.map("item.email")      // Array mapping
upper($input.text)                  // String helpers

Expressions work in every field — prompts, HTTP headers, conditions, email bodies, Redis keys, and more.

🔐 Node-Level Error Handling

Every node supports retry on failure and error branching:

Input ──→ HTTP ──→ Output
               └─── error ──→ Error Handler

• Retry — automatically re-run a failed node with configurable attempts and backoff
• Error branch — route failures to a dedicated path instead of stopping the workflow
• Error context — access $nodeName.error in downstream nodes

🏗️ Tech Stack

📁 Project Structure

heym/
├── frontend/src/
│   ├── components/     # Canvas, Nodes, Panels, Credentials, Evals, MCP, Teams
│   ├── views/          # DashboardView, EditorView, ChatPortalView
│   ├── stores/         # Pinia (workflow, auth, folder)
│   ├── services/       # API clients
│   └── docs/content/   # In-app documentation (Markdown)
├── backend/app/
│   ├── api/            # Routes: workflows, auth, mcp, portal, evals, traces…
│   ├── models/         # Pydantic schemas + SQLAlchemy models
│   ├── services/       # Executor, LLM, RAG, agent engine
│   └── db/             # Database configuration
├── alembic/            # Database migrations
├── docker-compose.yml
├── run.sh              # Local development launcher
├── check.sh            # Project validation script
└── deploy.sh           # Docker production deployer

⚙️ Environment Variables

🛠️ Development

Prerequisites: Bun ≥ 1.0 · Python ≥ 3.11 · UV · Docker

# Start all services (recommended)
./run.sh
./run.sh --no-debug    # INFO logging instead of DEBUG

Or start each service manually:

# Start database only
docker-compose up -d postgres

# Backend
cd backend && uv sync && uv run alembic upgrade head
uv run uvicorn app.main:app --reload --port 10105

# Frontend (separate terminal)
cd frontend && bun install && bun run dev

Validation (lint + typecheck + tests):

./check.sh    # Run all checks — required before pushing

Or run individually:

cd frontend && bun run lint && bun run typecheck
cd backend  && uv run ruff check . && uv run ruff format .

📄 License

This project is licensed under the Commons Clause applied to the MIT License. In other words, Heym is source-available rather than OSI-open-source. See the LICENSE file for details.

TL;DR: You are free to use, modify, distribute, and self-host this software — but you may not sell it or offer it as a paid service. Commercial licensing is available for teams that need those rights.

💬 Community

Join our Discord to connect with the community, ask questions, share workflows, and stay up to date:

🏢 Enterprise

Commercial use, enterprise licensing, and professional support are available.

What we offer:

• Workflow automation infrastructure & deployment
• Custom feature development on Heym
• Debugging, troubleshooting & solution support
• Priority support & SLA guarantees

📧 Contact: [email protected]