Comparison

Cortex Relay vs Simple JavaScript

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Cortex Relay

Access powerful AI agents like Claude Code from your iPhone via a chat interface or a full SSH terminal. Features include on-device voice input, persistent sessions, and secure credential management. Customize your terminal experience with various themes and font sizes.

Highlights
  • AI agent chat interface
  • Full SSH terminal access
  • On-device voice input
  • Persistent tmux sessions
  • Secure SSH key management
  • Customizable terminal themes
Read full description

Run Claude Code (or Codex and any other AI agent) from your iPhone. Cortex Relay gives you two ways to work with Claude Code on a remote machine — a friendly chat UI and a full-blown SSH terminal. Pick the right tool for the moment. THE CHAT Speak or type a prompt. Claude Code runs on your server, and the response streams back as a clean conversation with tool activity, cost breakdowns, and one-tap shortcuts for common tasks like committing, reviewing branches, or checking status. Upload photos from your camera roll and Claude can see them too. THE TERMINAL A real SSH terminal session. Cortex Relay renders the full CLI experience — interactive permission prompts, slash commands, MCP integrations, vim, git, whatever you need. Seven color themes from Nord to Dracula, pinch to resize, and a shortcut bar for /compact, /clear, /model, /status, and /cost. VOICE INPUT On-device speech recognition powered by OpenAI's Whisper. Pick a model size (tiny, base, small) and language (English or multilingual). Runs entirely on your phone — no server round-trip, works offline. Apple's built-in speech engine is available by default too. SESSIONS THAT SURVIVE Every terminal session runs inside tmux. Background the app, lose WiFi, switch to a call — your session keeps running on the server. Come back and everything is exactly where you left off. No reconnect dance. NOTIFICATIONS Get a push when Claude finishes a long task or needs your approval. The chat sends these automatically. For terminal sessions, drop a one-line webhook into your project's CLAUDE.md and Claude does the rest. SECURE BY DEFAULT Generate ed25519 SSH keys directly in the app or import your existing ones. Keys live in the iOS Keychain, optionally locked behind Face ID or Touch ID. Password auth is supported too, with the same biometric protection. Your credentials never leave the device. ORGANIZED Create named servers with saved directories. Spin up Chat or Terminal connections to any project on any machine. Each connection remembers its own dictation preferences. One server, many projects, zero re-entering credentials. YOUR TERMINAL, YOUR WAY Navy, Homebrew, Nord, Dracula, Solarized Dark, One Dark, Pure Black — pick a theme, see it applied instantly. Pinch to zoom the font size. It sticks between sessions. WHAT STAYS ON YOUR PHONE - SSH keys and passwords in iOS Keychain with biometric lock - Whisper speech recognition runs on-device only - No credentials sent to our servers - Push relay handles notification delivery — nothing else

About

Simple JavaScript

Features
Read full description

“Want to try code while you’re on the go?” This app is a simple JavaScript editor and runtime designed for smartphones. It provides a powerful code editor with syntax highlighting, allowing you to write and run JavaScript code instantly. It is suitable for everything from learning JavaScript to practical coding and testing. Common use cases include: * Learning JavaScript * Programming practice * Learning web development * Studying algorithms * Testing code snippets * Verifying sample code * Taking JavaScript notes * Creating scripts * Testing functions * Writing code for technical blogs * Training and workshops * Building prototypes * Managing code snippets * Experimenting with new ideas * Creating a simple testing environment during development JavaScript can be used in many different ways, and this app helps you quickly write, test, and manage your code. If you are looking for a JavaScript editor and runtime, give it a try. ■ Features • Intuitive Interface Simple tools should be easy to use. The editor is designed to be fast, responsive, and comfortable for everyday coding. • Run Code Instantly Execute JavaScript code with a single tap. View output and error messages immediately. • Code Auto Completion Built-in code completion helps you write code more efficiently. • Code Formatting Automatically format your code to improve readability and maintain a clean coding style. • Find and Replace Search and replace text within your code quickly and easily. • Code Folding Collapse and expand code blocks to make large files easier to navigate. • Easy Cursor Navigation Move the cursor using directional controls for more precise editing. • Automatic Saving Your code is automatically saved while editing, so you never have to worry about losing changes. • Ready to Use No account registration is required. Start coding immediately after installation. • Export and Share Export and share your code with others. Useful for backups and editing on different devices. • Dark Theme Support Supports dark mode for comfortable coding day and night.

Screenshots

Cortex Relay4 screens
Simple JavaScript4 screens

Verdict

The call

The clearest difference is in-app purchases: Cortex Relay at none against Simple JavaScript's 2. Simple JavaScript's advantage is update cadence (monthly vs every 2 months) and device support (3 vs 1). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Simple JavaScript sells 2 in-app purchases, starting at $1.99 per month. Cortex Relay asks for nothing beyond the download.

UpkeepUpdate frequency

Cortex Relay ships an update every 2 months, Simple JavaScript monthly. The most recent releases landed on September 18, 2026 and September 21, 2026 respectively.

Scorecard4 real differences · 6 level
Cortex Relay versus Simple JavaScript: the parameters behind the verdict, then further details
ParameterCortex RelaySimple JavaScript
PriceFreeFree
Rating4.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 2 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.015.6 — better
Further details — not scored
Size14 MB54 MB
Age rating4+4+
DeveloperMaksim MikheevYUKI TANAIKE

In-app purchases

None

Cortex Relay

No in-app purchases

2 purchases

Simple JavaScript

Subscriptions2
  • Simple JavaScript Pro (Monthly)$1.991 Month
  • Simple JavaScript Pro (Annual)$18.001 Year

Questions

Is Cortex Relay free?
Cortex Relay is free to download, with no in-app purchases.
Is Simple JavaScript free?
Simple JavaScript is free to download, with in-app purchases available.
Do Cortex Relay or Simple JavaScript have ads?
Neither Cortex Relay nor Simple JavaScript shows ads.
Which is updated more often, Cortex Relay or Simple JavaScript?
Cortex Relay ships an update every 2 months, and Simple JavaScript monthly. Most recently, Cortex Relay was updated on September 18, 2026 and Simple JavaScript on September 21, 2026.

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