Skip to main content

01 Code comprehension / OpenAI & Claude

Understand the code.
Own the next step.

Get security, performance, and learning lenses tailored to your skill level, right in GitHub or your editor.

Paste Your Own
quickSort.jsJavaScript · 7 lines · sample
function quickSort(arr) {
if (arr.length <= 1) return arr;
const pivot = arr[0];
const left = arr.slice(1).filter(x => x <= pivot);
const right = arr.slice(1).filter(x => x > pivot);
return [...quickSort(left), pivot, ...quickSort(right)];
}

Lines 2: Arrays of 0–1 elements are already sorted.

02 / The understanding · Example explanation
This is QuickSort, a divide-and-conquer sorting algorithm. How it works: 1. Base case: arrays of 0-1 elements are already sorted 2. Pick first element as the pivot point 3. Partition: elements ≤ pivot go left, > pivot go right 4. Recursively sort both partitions 5. Combine: left + pivot + right Complexity: O(n log n) average, O(n²) worst case

Same code. Your level. Choose a mode to compare explanations.

  • 10 free explanations daily
  • No account needed to try
  • Never used to train AI models
01Your Language, Covered
17
Python, TypeScript, Rust, Go, Java: paste any language
02Ways to Understand
7
From quick overviews to security audits and performance analysis
03Streaming Output
Real-time
See explanations appear word-by-word, no waiting for results
04Ways to Import Code
4
Paste, drag-and-drop a file, paste a GitHub URL, or use the API

02 Built for understanding

What You Get

Purpose-built for code comprehension, not general chat. Each note below is one thing the product returns, set beside the line it explains.

notes.jsJavaScript · 14 lines · sample
function quickSort(arr) {
Skill level L1Think of it like sorting a deck of cards: pick one, make two piles, repeat.
if (arr.length <= 1) return arr;
const pivot = arr[0];
const left = arr.slice(1).filter(x => x <= pivot);
const right = arr.slice(1).filter(x => x > pivot);
return [...quickSort(left), pivot, ...quickSort(right)];
Complexity L6O(n log n) average, O(n²) worst case.
}
const rows = await db.query(
"SELECT * FROM users WHERE id = " + req.query.id
Security L9SQL injection risk: the id is concatenated into the query. Use a parameterized query.
);
const res = await fetch("/api/explain", {
API L11POST /api/explain returns the same walkthrough as JSON. API keys start on Pro.API documentation
method: "POST",
body: JSON.stringify({ code, mode: "security" }),
});

7 modes, 17 languages

Choose how the same lines get read. Every mode runs on the language you paste.

quick
A brief summary of what the code does.
standard
A clear, balanced explanation for most code.
detailed
An in-depth breakdown with edge cases.
performance
Optimization tips and bottleneck analysis.
security
Vulnerability detection and fixes.
learning
An educational pass with the concepts explained.
comparative
Other ways to write the same code.

03 Choose your depth

Pricing

Free tier. No credit card. Upgrade when you need more.

Free

Perfect for trying out ExplainThisCode

$0/mo
  • Up to 20 requests per day once you sign up
  • Standard AI models
  • 17 languages
  • Core analysis modes
  • Community support
Start Explaining

Pro

For professional developers

Recommended

$19/mo
  • 500 explanations per day
  • All languages supported
  • VS Code & IDE extensions
  • Visual code diagrams
  • Export explanations as PDF
  • Email support
Upgrade to Pro

Team

For teams, billed per seat

$12/mo
  • Everything in Pro
  • 2,000 explanations per day
  • 10 API keys
  • Shared team workspace
  • From 4 to 20 seats
  • Priority email support
Start with your team

Enterprise

For large organizations

Custom
  • Everything in Team
  • Higher limits negotiated to your needs
  • Self-hosted or private deployment (discuss)
  • Security & compliance reviews (by arrangement)
  • Higher API quotas and keys
  • Custom integrations
Contact Sales

Served over HTTPS. See the Privacy Policy for how we handle data and GDPR-related rights.

04 Before you paste

Frequently Asked Questions

Can I try it without signing up?

Yes. You can run up to 10 explanations per day without an account (rolling 24 hours). Just paste code.

What programming languages are supported?

JavaScript, TypeScript, Python, Java, C++, Go, Ruby, PHP, Rust, Swift, Kotlin, and more.

Is my code stored on your servers?

Only if you're signed in. Signed-in explanations, including the code, are saved to your history so you can revisit and share them, and you can delete any of them from the explanation page. Logged-out requests aren't saved to an account. Your code is never used to train AI models.

How is this different from ChatGPT or GitHub Copilot?

ChatGPT answers anything. ExplainThisCode is built for code comprehension: Security and Performance modes, skill-level adaptation, GitHub/IDE extensions, and shareable explanation history, so you review PRs faster without generic wall-of-text replies.

What counts as a "token" in my usage?

Tokens are units of text processed by the AI. Roughly, 1 token equals about 4 characters or 0.75 words. A typical code snippet of 50 lines uses around 500-1000 tokens including the explanation generated.

What's included in the different subscription tiers?

No account: 10 explanations/day. Free (signed in): 20 explanations/day. Pro ($19/mo): 500 explanations/day, API access, 5 API keys. Team and Enterprise: higher limits, see Pricing or contact sales. Every plan has a fair-use monthly cap.

View all 12 questions →

Your next walkthrough

Try it now: explain a PR diff in seconds

10 free explanations per day. No credit card. Built for code review, not generic chat.

Try Free NowView Pricing
About usDocumentationChangelogSupportContact