2
Initialize a new Hot project
Add to any existing codebase
Creates a .hot data directory, hot/src source directory, and hot.hot configuration file
3
Write some Hot code
in hot/src
4
Run the dev servers
App, API, Scheduler, Worker — all in one command
Runs
Every execution captured. Status, timing, input, output, full trace.
Events
See every event, its payload, and which handlers processed it.
Execution Trace
Each expression, intermediate values, return values, timing.
Errors
Failures, cancellations, stack traces. Debug fast.
Real-time observability for your workflows
Everything you need from local dev to production
Core
Event Handlers
Trigger functions automatically when events occur
Scheduled Runs
Run functions on a cron or natural-language schedule
Hot Packages
Pre-built integrations for AI and SaaS services
HTTP API
OpenAPI-compatible REST endpoints
MCP Tools
Turn any Hot function into an MCP Tool for AI agents
Webhooks
Turn any Hot function into a Webhook endpoint
File Storage
Read, write, and manage files in your environment
Configurable Retries
Retry failed runs with configurable attempts, delay, and backoff
Hot App
Real-time dashboard for runs, events, streams, and execution traces
Execution Tracing
Every expression traced with intermediate values, timing, and full call stack
Environments
Setup separate environments for staging, production, or whatever you need
Teams
Invite team members with role-based access to projects and environments
The Hot Language
Familiar Data Literals
If you know JSON, you know Hot's data syntax. Maps, vectors, strings, numbers — all familiar.
Types Are Optional
Add types where they help, skip them where they don't. Autocomplete and error checking when you want it.
Flows Control Execution
Parallel, conditional, and pipe patterns built into the language. Clean workflow logic.
Run Control
Fail fast, cancel gracefully. Built-in primitives for controlling workflow execution.
Standard Library
Rich built-in functions for collections, strings, math, HTTP, and more. Ready to use.
Development Tools
Hot CLI
Run, test, and deploy from the command line
VS Code & LSP
Syntax highlighting, autocomplete, diagnostics
Testing Framework
Built-in test runner for unit and integration tests
Security
Secret Variables
Encrypted secrets and config with AES-256-GCM
API Keys
Create, rotate, and manage API keys
Service Keys & Sessions
Scoped credentials and short-lived tokens for your customers
Granular Permissions
Fine-grained resource and action-level access control
Cloud
Hot Cloud
Deploy with one command, scale automatically
Alerts
Get notified via email, Slack, PagerDuty, or webhooks when events occur
Custom Domains
Serve your API, MCP, and Webhooks from your own custom domains
Ready to ship?
Free local development.
Simple, transparent cloud pricing when you're ready.
Things people say
"Hot Dev? Is that a dating site for developers?"
— Everyone, at first
"Print statements aren't observability!"
— Us, constantly
"Wait, I can actually see my code running?"
— Developers, after trying Hot
Pre-built integrations for the tools you use
OpenAI
Anthropic
Gemini
xAI
AWS
Resend
Postmark
Slack
MCP
JSON-RPC
... and more coming soon
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