Orthex

LeetCode AI Code Review & Big-O Checker

A multi-pass AI debrief that runs directly inside LeetCode.
Analyze your approach. Visualize complexity. Learn what to study next.

No account  ·  No server  ·  No cost

---

What it does

Orthex runs three sequential analysis passes on your submission, then generates a personalized learning path.

Pass	Feature	What you get
01	Approach Analysis	Identifies your algorithmic technique (DFS, DP, Two Pointers…), compares it to the optimal, and leaves you with one sharp follow-up question.
02	Complexity Visualization	Estimates your current time & space complexity and the theoretical optimum, plotting both on an animated SVG graph — O(1) → O(2ⁿ).
03	Code Style Review	Rates readability and structure: Excellent / Good / Fair / Poor — with concise, actionable critique.
04	Learning Path	Recommends 2–3 specific LeetCode problems and the concepts behind them based on what the analysis found.
✦	Solutions	Generates Intern · L5 Engineer · Staff Architect approaches, streamed with step-by-step Mermaid flowchart explanations.

Supported verdicts: Accepted  ·  Wrong Answer  ·  TLE  ·  MLE  ·  Runtime Error  ·  Compile Error

---

Themes & Customization

Orthex ships with two distinct design languages out of the box.

Editorial Theme (Glassmorphism)	Neubrutalism Theme (Bold & Raw)

---

How it works

Submit on LeetCode
        ↓
  content.js extracts problem title, difficulty,
  language, verdict, runtime, memory, and code
        ↓
  service-worker.js sends a structured prompt
  to Groq  →  openai/gpt-oss-120b
        ↓
  JSON response parsed into 4 analysis panels
        ↓
  Result cached in chrome.storage.local
  (repeat views cost zero API tokens)

---

Requirements

• Browser: Google Chrome or any Chromium-based browser
• API Key: A free Groq API key — the free tier is more than enough for daily practice

---

Installation

Orthex is not yet published to the Chrome Web Store. Load it as an unpacked extension:

1. Download or clone this repository.
2. Open Chrome → chrome://extensions/
3. Enable Developer mode (toggle, top-right).
4. Click Load unpacked → select the project folder.
5. The Orthex icon appears in your toolbar.

Configure your API key:

1. Click the Orthex icon.
2. Paste your Groq API key → click Save.
3. The status indicator turns 🟢 green when stored. The key lives in chrome.storage.sync and never leaves your browser.

---

Usage

Navigate to any LeetCode problem, write a solution, and submit.

Mode	How to trigger	Behavior
Auto (default)	Submit a solution	Panel appears automatically for Accepted, WA, and TLE. Configurable in settings.
Manual	Click Analysis button	Trigger on demand. Click again to dismiss.
Solutions	Click Solutions button	Streams 2–3 approaches with Mermaid flowcharts.

---

Privacy

Your code goes directly from your browser → Groq's API. Orthex has:

• ✦ No backend server
• ✦ No database
• ✦ No telemetry

Your API key is stored locally in Chrome's sync storage. We never see your code.

The BYOK (Bring Your Own Key) model is not a workaround — it is the architecture. We will not offer a tier that routes your code through our servers.

---

File Structure

├── manifest.json              — Chrome Extension Manifest V3
├── DESIGN.md                  — Design system reference
├── BRAND.md                   — Brand guidelines and voice
├── background/
│   └── service-worker.js      — Groq API calls, caching, response parsing
├── scripts/
│   ├── content.js             — DOM injection, analysis panels, theme sync
│   └── extractor.js           — Extracts submission data from LeetCode's DOM
├── styles/
│   ├── main.css               — Design tokens: colors, typography, spacing
│   └── panel.css              — Analysis panel component styles
├── popup/
│   ├── popup.html             — Settings popup
│   ├── popup.js               — API key storage, settings logic
│   └── popup.css              — Popup styles
├── assets/
│   └── icon.svg               — Premium Tetris brand icon
└── lib/
    ├── marked.min.js          — Markdown renderer
    └── mermaid.min.js         — Flowchart renderer

---

Model & API

Property	Value
Model	openai/gpt-oss-120b via Groq
Tokens / analysis	~800 (prompt + response)
Tokens / solution	Up to 4,000 per approach
Rate limit handling	Exponential backoff in service worker

---

Permissions

Permission	Reason
storage	Store your API key and analysis cache
unlimitedStorage	Cache results across many submissions
activeTab	Read the current LeetCode submission page
scripting	Inject the analysis panel into the page
https://leetcode.com/*	Run on LeetCode problem and submission pages
https://api.groq.com/*	Send requests to Groq's API

---

Limitations

• DOM dependency — Orthex reads submitted code from the DOM. LeetCode UI updates may break the code extraction selector. If only stats appear without code, the selector likely changed.
• AI estimates — Complexity grades and approach suggestions reflect the model's pattern recognition. Treat them as a starting point, not absolute ground truth.
• Mermaid edge cases — Syntax errors in complex auto-generated diagrams are caught and suppressed. The step-by-step explanation text still renders.