RuntimeNest Get RuntimeCode
RuntimeNest · iOS

An AI coding agent
that lives in your pocket.

RuntimeCode is a native iPhone app that brings an AI coding assistant to iOS — read, write, and search your own files; preview HTML in a built-in browser; sync conversations across devices with a Pro subscription. No ads, no analytics SDKs, one tap to wipe your data.

Available on the App Store See how it works
  • iOS 16+
  • On-device workspace
  • Free daily quota · Pro for more
Our first product

RuntimeCode — an AI agent in a sandbox you control.

A tool-using AI coding agent, reimagined for the iPhone. SwiftUI on top, a tight on-device sandbox underneath, and a thin RuntimeNest proxy in between that holds the AI key and meters your quota.

💬

Chat

An AI coding assistant that uses tools on your workspace and remembers past conversations across sessions.

📁

Files

A sandboxed Workspace/ folder, also visible in the iOS Files app under On My iPhone › Runtime Code.

⌨️

Editor

A monospace code editor with lightweight syntax highlighting for HTML, CSS, JS/TS, Swift, Python, Markdown, and JSON.

🌐

Browser

A built-in WebKit view that previews HTML files from your workspace, with linked CSS/JS resolved relatively.

⚙️

Settings

Manage your Pro subscription, check your monthly quota, sign in with GitHub, and tune the editor font.

The agent toolbelt

A small, sandboxed tool set — by design.

iOS doesn’t allow arbitrary shells or child processes. RuntimeCode keeps the agent on a tight leash: it can only touch files inside your workspace.

Tool
What it does
list_files
List a workspace folder.
file_read
Read a UTF-8 text file.
file_write
Create or overwrite a file.
file_edit
Find & replace inside a file.
glob
Match files by glob pattern.
grep
Regex-search file contents.
open_in_browser
Show an HTML file in the Browser tab.

No bash. No shell. No arbitrary process execution. Just file I/O the OS already trusts the app with — plus opt-in calls to GitHub via your own token.

How it works

From a prompt to a working file, in three steps.

  1. 1

    You talk to RuntimeCode.

    Type a request in the Chat tab. RuntimeCode forwards it through our thin proxy at runtimecode-proxy.michaelw4ai.workers.dev, which calls the AI and streams the reply back.

  2. 2

    The agent calls tools.

    RuntimeCode decides to file_write, grep, or open_in_browser — RuntimeCode runs each call against your sandboxed workspace.

  3. 3

    You see the result.

    Open the file in the Editor, preview HTML in the Browser, or keep iterating in Chat. Your files live in Documents/Workspace/.

Privacy you can audit

Minimal data. Clear controls. No ads, ever.

RuntimeCode runs through a thin RuntimeNest proxy that holds the AI key and enforces your quota. We store only what's needed to answer you and keep your conversations available next time you open the app.

  • We store your chat messages and the AI's replies — kept until you delete them, with no automatic expiry.
  • One tap in Settings → Privacy wipes every server-side record we have for your device or subscription.
  • Your project files stay on your iPhone (or your iCloud Drive). We never receive them as raw files.
  • Attached images are forwarded to the AI for that turn, then dropped — we don't store the bytes.
  • GitHub tokens live only in your iOS Keychain. Clone / pull / push / PR calls go straight to api.github.com — we are not in the middle.
  • No advertising SDKs. No third-party analytics. We don't sell data.
Read the full privacy policy →

Code with RuntimeCode. On your phone. On your terms.

Start free with a daily quota, or go Pro for 1,000 calls a month. Build from the train, the couch, or the queue.

Get RuntimeCode