Now in Public Beta

You shipped it.
Could you explain it?

Whether you wrote it, copied it, or prompted it — finally understand what your code actually does.

Try it free See how it works

snippet.ts

async function analyzeData(data) {

// Wait, why do we map here?

const results = data.map(item => {

return process(item);

});

await db.save(results);

}

Syntral AnalysisLive

Pattern Found

Async Array Mapping

Line 3-6 · Common pitfall detected

Challenge

What happens if process() fails?

Your Score

87%

+2k

2,000+ developers finally understand their code

Marcus Chen

Indie Hacker

“I built an entire app with Claude Code but couldn't explain any of it. Now I actually understand my own codebase.”

Vibe Coder → Real Dev

Sarah Kim

Self-taught Developer

“Finally understand async/await after 2 years of just copying patterns. The challenges actually made it click.”

Bootcamp → Senior

Alex Rivera

Career Switcher

“Went from 'it works idk why' to actually debugging my AI-generated code. Interview confidence through the roof.”

Prompt Engineer → SWE

Sound familiar?

Two types of developers use Syntral. Which one are you?

The Vibe Coder

"I prompted my way to a working app with Cursor. It ships. But when something breaks, I just paste the error back and pray. I couldn't whiteboard this in an interview if my life depended on it."

CursorOpenCodeCodexv0

The Skill Builder

"I've been coding for 2 years but I still don't really get async/await. I watch mass tutorials but nothing sticks. I don't know what I don't know — and it's killing my confidence."

Self-taughtBootcamp gradCareer switcher

Same problem, different paths. One solution.

Finally understand your code

A simple 4-step process to move from "it works" to "I know why".

Paste your code

Drop in any code — even if Cursor, Copilot, or ChatGPT wrote it for you.

Get challenged

AI asks you what each part does — BEFORE explaining it.

Explain it back

Put it in your own words. That's when real understanding happens.

See the gaps

Know exactly what you understand and what needs work.

Try it now — it's free

Code with confidence

Everything you need to master your own codebase.

Concept breakdown

See the why, not just the what

Every pattern, method, and concept in your code — color-coded and explained. Finally understand WHY your code works.

Code Analysis

Array Method

Async Pattern

Error Handling

Mastery tracking

Visualize your skill tree

Watch your JavaScript mastery grow across 50+ concepts. See exactly where you're strong and where you need practice.

Skill Tree

Arrays

Async

Objects

Closures

Types

Errors

Gap analysis

Pinpoint knowledge gaps

Discover blind spots before your next code review or interview. Get specific recommendations on what to learn next.

Gap Analysis

Promise chaining

25%

Error boundaries

40%

Type narrowing

60%

3 concepts need attention

Growth metrics

Prove your progress

Track streaks, see trends, and watch your understanding compound over time. Your growth, visualized.

Progress Tracking

Last 12 sessions+163% growth

🔥

7-day streak!

Unique to Syntral

Your JavaScript
Skill Tree

Watch your understanding grow across 50+ JavaScript concepts. See exactly where you excel and where you need practice — no guessing, just data.

50+

Concepts tracked

Real-time

Progress updates

92%

JS Core

88%

Arrays

85%

Objects

90%

Functions

72%

Async/Await

45%

Errors

38%

Patterns

Simple, honest pricing

Invest in your skills. It pays the best interest.

Free

$0/forever

3 analyses per day
Basic explanations
Shareable results

Start free

Pro

$19/month

Unlimited analyses
Challenge mode
Skill tracking
Priority AI
Early access to features

Go Pro

Limited spots

Lifetime

$79/one-time

Everything in Pro
One-time payment
Founding member badge
Direct feedback channel

Get Lifetime Access

Questions?

We've got answers.

Currently JavaScript, TypeScript, and React. More coming soon.

No. Leetcode is about solving algorithm puzzles. We help you understand code you've already written.

ChatGPT explains TO you. We challenge you to explain it yourself — that's when real learning happens.

No. Even experienced developers discover gaps in their understanding.

Yes! Your code is processed securely and not stored unless you save it.

Ready to actually understand your code?

Start with one piece of code. You might be surprised what you learn.

Get started free

No credit card required. Understand your first code in 60 seconds.

Now in Public Beta

You shipped it.
Could you explain it?

Whether you wrote it, copied it, or prompted it — finally understand what your code actually does.

Try it free See how it works

snippet.ts

async function analyzeData(data) {

// Wait, why do we map here?

const results = data.map(item => {

return process(item);

});

await db.save(results);

}

Syntral AnalysisLive

Pattern Found

Async Array Mapping

Line 3-6 · Common pitfall detected

Challenge

What happens if process() fails?

Your Score

87%

+2k

2,000+ developers finally understand their code

Marcus Chen

Indie Hacker

“I built an entire app with Claude Code but couldn't explain any of it. Now I actually understand my own codebase.”

Vibe Coder → Real Dev

Sarah Kim

Self-taught Developer

“Finally understand async/await after 2 years of just copying patterns. The challenges actually made it click.”

Bootcamp → Senior

Alex Rivera

Career Switcher

“Went from 'it works idk why' to actually debugging my AI-generated code. Interview confidence through the roof.”

Prompt Engineer → SWE

Sound familiar?

Two types of developers use Syntral. Which one are you?

The Vibe Coder

"I prompted my way to a working app with Cursor. It ships. But when something breaks, I just paste the error back and pray. I couldn't whiteboard this in an interview if my life depended on it."

CursorOpenCodeCodexv0

The Skill Builder

"I've been coding for 2 years but I still don't really get async/await. I watch mass tutorials but nothing sticks. I don't know what I don't know — and it's killing my confidence."

Self-taughtBootcamp gradCareer switcher

Same problem, different paths. One solution.

Finally understand your code

A simple 4-step process to move from "it works" to "I know why".

Paste your code

Drop in any code — even if Cursor, Copilot, or ChatGPT wrote it for you.

Get challenged

AI asks you what each part does — BEFORE explaining it.

Explain it back

Put it in your own words. That's when real understanding happens.

See the gaps

Know exactly what you understand and what needs work.

Try it now — it's free

Code with confidence

Everything you need to master your own codebase.

Concept breakdown

See the why, not just the what

Every pattern, method, and concept in your code — color-coded and explained. Finally understand WHY your code works.

Code Analysis

Array Method

Async Pattern

Error Handling

Mastery tracking

Visualize your skill tree

Watch your JavaScript mastery grow across 50+ concepts. See exactly where you're strong and where you need practice.

Skill Tree

Arrays

Async

Objects

Closures

Types

Errors

Gap analysis

Pinpoint knowledge gaps

Discover blind spots before your next code review or interview. Get specific recommendations on what to learn next.

Gap Analysis

Promise chaining

25%

Error boundaries

40%

Type narrowing

60%

3 concepts need attention

Growth metrics

Prove your progress

Track streaks, see trends, and watch your understanding compound over time. Your growth, visualized.

Progress Tracking

Last 12 sessions+163% growth

🔥

7-day streak!

Unique to Syntral

Your JavaScript
Skill Tree

Watch your understanding grow across 50+ JavaScript concepts. See exactly where you excel and where you need practice — no guessing, just data.

50+

Concepts tracked

Real-time

Progress updates

92%

JS Core

88%

Arrays

85%

Objects

90%

Functions

72%

Async/Await

45%

Errors

38%

Patterns

Simple, honest pricing

Invest in your skills. It pays the best interest.

Free

$0/forever

3 analyses per day
Basic explanations
Shareable results

Start free

Pro

$19/month

Unlimited analyses
Challenge mode
Skill tracking
Priority AI
Early access to features

Go Pro

Limited spots

Lifetime

$79/one-time

Everything in Pro
One-time payment
Founding member badge
Direct feedback channel

Get Lifetime Access

Questions?

We've got answers.

Currently JavaScript, TypeScript, and React. More coming soon.

No. Leetcode is about solving algorithm puzzles. We help you understand code you've already written.

ChatGPT explains TO you. We challenge you to explain it yourself — that's when real learning happens.

No. Even experienced developers discover gaps in their understanding.

Yes! Your code is processed securely and not stored unless you save it.

Ready to actually understand your code?

Start with one piece of code. You might be surprised what you learn.

Get started free

No credit card required. Understand your first code in 60 seconds.

You shipped it. Could you explain it?

Sound familiar?

The Vibe Coder

The Skill Builder

Finally understand your code

Paste your code

Get challenged

Explain it back

See the gaps

Code with confidence

See the why, not just the what

Visualize your skill tree

Pinpoint knowledge gaps

Prove your progress

Your JavaScriptSkill Tree

Simple, honest pricing

Free

Pro

Lifetime

Questions?

Ready to actually understand your code?

You shipped it. Could you explain it?

Sound familiar?

The Vibe Coder

The Skill Builder

Finally understand your code

Paste your code

Get challenged

Explain it back

See the gaps

Code with confidence

See the why, not just the what

Visualize your skill tree

Pinpoint knowledge gaps

Prove your progress

Your JavaScriptSkill Tree

Simple, honest pricing

Free

Pro

Lifetime

Questions?

Ready to actually understand your code?

You shipped it.
Could you explain it?

Your JavaScript
Skill Tree

You shipped it.
Could you explain it?

Your JavaScript
Skill Tree