Host4 AI

Overview

Host4 AI is a managed cloud hosting platform built for running AI coding agents like Claude Code and OpenAI Codex around the clock. You get a persistent Linux environment with browser terminal, SSH, and free SSL, so your agent keeps working even when you close your laptop. It suits developers running long refactors, non-technical founders building sites from prompts, and teams that need a shared, always-on AI coding workspace without managing servers themselves.

Key Features

Managed Claude Code and Codex Hosting: Both agents come pre-installed in a persistent Linux environment, so you can start coding without setup work.
Browser Terminal and SSH Access: Reach your environment from any device through a web terminal or standard SSH, with tmux sessions that keep agents running.
Bring Your Own AI Credentials: Connect an Anthropic API key or log in with your Claude Pro/Max subscription so you only pay Host4 AI for hosting.
Full Root Linux Access: Install Aider, ChatGPT CLI, or any other AI coding tool alongside Claude Code with no restrictions.
AI Builder for Non-Coders: Describe your idea in plain English and Claude Sonnet 4 builds a live site for you, with image upload and live preview.
Custom Domains and Free SSL: Every project gets a .host4.ai subdomain, and paid plans support custom domains with automatic SSL certificates.
Zero Lock-In Code Portability: Download files via the file manager, clone with git, or copy over SSH/SCP anytime you want to leave.
Isolated Environments with Daily Backups: Each account runs on its own filesystem and network, with backups stored on a separate server.

Pros

Cost-Effective for Heavy AI Users: Bring your own Claude subscription or API key and pay as little as $5/month for the server itself.
Free First Site Forever: Create and host one project permanently at no cost. The free plan includes 20 AI messages, 1 vCPU, 1 GB RAM, and 5 GB storage for testing the platform.
Persistent AI Agents: If you hit usage limits, your site and files stay live; only new AI messages pause until you top up.
Flexible Tool Support: Full root access means you are not locked into one AI coding tool and can run several at once.
True Code Ownership: Export projects anytime through git, SSH, or the file manager, so migrating away is straightforward.

Cons

Limited RAM on Entry Tiers: The lifetime and starter plans include only 1 GB RAM, which can be tight for larger repos or heavy agent bursts.
Requires a Separate AI Subscription for Continuous Work: After 20 free messages you need your own Anthropic account or API credits to keep using the AI features.
Command Line Knowledge Is Helpful: While the AI Builder is no-code, getting full value from the terminal environment still expects basic Linux familiarity.

Use Cases

Long-Running Autonomous Refactors: Point Claude Code at a large codebase, kick off a refactor inside tmux, close your laptop, and check the results later from your phone or browser.
Prompt-to-Website Building for Non-Coders: Founders and designers describe an idea in plain English through the AI Builder and get a live site on a .host4.ai subdomain in minutes.
Persistent Side Project Environment: Keep dependencies, environment variables, and background processes in one always-on place instead of rebuilding your local setup.
Shared Team Coding Workspace: Multiple developers SSH into the same environment to use Claude Code with consistent tooling and no local setup drift.
Multi-Agent Experimentation: Run Claude Code, Codex, and Aider side by side to compare outputs on the same repo without juggling local installs.
Mobile AI Agent Management: Users can check progress, reconnect to sessions, and manage AI coding tasks from a phone browser while the cloud environment continues running.

Frequently Asked Questions

What is Host4 AI?

Host4 AI is a managed cloud hosting service built specifically for AI coding agents. It gives you a persistent Linux environment with Claude Code and Codex pre-installed, plus browser terminal, SSH, and free SSL.

How much does Host4 AI cost?

Host4.ai offers a free plan with one permanent website and 20 AI messages. Paid plans start at $15/month (or $13.75/month when billed annually), while the Business plan costs $49/month for larger workloads. A limited-time $99 lifetime plan is also available for users who prefer a one-time payment. Optional add-ons include custom domains, dedicated IPs, email hosting, and expert setup services.

Do I need my own Claude subscription?

You get 20 free messages to start. After that, you connect your own Anthropic API key or log in with a Claude Pro or Max subscription, so your AI usage is billed by Anthropic and hosting is billed by Host4 AI.

Can I run tools other than Claude Code?

Yes. You have full root access to an Ubuntu environment, so you can install and run OpenAI Codex, ChatGPT CLI, Aider, Continue, or any other AI coding tool alongside Claude Code.

What happens if I hit my usage limits?

Your site stays live and is never taken down. You just cannot send new AI messages until you upgrade or buy more credits, and you can still edit files manually and use the terminal.

Can I use a custom domain?

All paid plans support custom domains. You point your DNS to Host4 AI's servers and SSL certificates are handled automatically, usually going live within minutes.