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Description
Happy, often referred to as Happy Coder, is a free and open-source client available for both mobile and web platforms, allowing users to create, observe, and manage multiple sessions of Claude Code AI coding agents across a variety of devices including phones, tablets, laptops, and desktops, all while ensuring real-time synchronization through an encrypted relay system that enables users to continue their work on different devices without any loss of context. This system features three interconnected components: a locally running CLI program that launches and oversees the Claude Code sessions, a mobile or web application that securely connects to the CLI via end-to-end encryption to protect user data from being accessed by anyone, even the relay server, and a relay server that merely transmits encrypted data between devices without accessing the information itself; this architecture allows developers to use their preferred tools, editors, and workflows while integrating remote control functionalities effortlessly. Additionally, the seamless transition between devices promotes enhanced productivity and flexibility for users engaged in coding tasks.
Description
Headroom cuts the token costs of Claude Code and ChatGPT Codex by ~50%, which can mean up to 2x as much usage on the plan you already pay for. It is a menu bar app for macOS, Windows and Linux that compresses the bulky tool output, logs and boilerplate a coding agent sends with every request.
Compression happens locally, before anything leaves the machine, so prompts and code stay private. Source code passes through untouched, and the agent can still fetch any original through a retrieval tool.
On noisy inputs such as JSON tool results, logs and long documents, savings run at ~50% and up; typical coding sessions land at 25-50% overall. Across 183 Claude Code users over one week, Headroom reduced input tokens by 34% (measured) and output tokens by 33% (estimated).
The app also includes a dashboard and activity feed with tokens and API-equivalent dollars saved, project learnings that turn past sessions into token-saving rules, and one-click add-ons: MarkItDown, Serena, Codebase Memory, Context7, Ponytail and Caveman.
7-day free trial, no credit card. Plans from $3/month.
API Access
Has API
Yes
API Access
Has API
No
Integrations
Claude Code
Yes
Grok Build
No
Model Context Protocol (MCP)
No
OpenAI Codex
No
OpenCode
No
Visual Studio Code
No
Integrations
Claude Code
Yes
Grok Build
Yes
Model Context Protocol (MCP)
Yes
OpenAI Codex
Yes
OpenCode
Yes
Visual Studio Code
Yes
Pricing Details
Free
Free Trial
No
Free Version
Yes
Pricing Details
$3/month
Pro is $3/month, billed annually ($36/year), or $4/month, billed monthly, for Claude Pro or ChatGPT Plus. Max x5 is $15/month, billed annually, or $20/month, billed monthly; Max x20 is $30/month, billed annually, or $40/month, billed monthly. Each plan includes a 7-day free trial with no credit card required. Team and Enterprise plans have custom pricing. A separate free, self-managed Headroom CLI is also available.
Free Trial
Yes
Free Version
No
Deployment
Web-Based
No
On-Premises
No
iPhone App
Yes
iPad App
Yes
Android App
Yes
Windows
Yes
Mac
Yes
Linux
Yes
Chromebook
No
Deployment
Web-Based
No
On-Premises
No
iPhone App
No
iPad App
No
Android App
No
Windows
Yes
Mac
Yes
Linux
Yes
Chromebook
No
Customer Support
Business Hours
Yes
Live Rep (24/7)
No
Online Support
Yes
Customer Support
Business Hours
No
Live Rep (24/7)
No
Online Support
Yes
Types of Training
Training Docs
Yes
Webinars
No
Live Training (Online)
No
In Person
No
Types of Training
Training Docs
Yes
Webinars
No
Live Training (Online)
No
In Person
No
Vendor Details
Company Name
Happy Coder
Country
United States
Website
happy.engineering/
Vendor Details
Company Name
Garm Tech
Founded
2026
Country
Netherlands
Website
extraheadroom.com