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engineers here.

Pick a topic. Get a custom challenge. KodaAI watches every keystroke and catches your misconceptions the moment they appear.

Download for macOS ⌘D Star on GitHub 1.2k

12,400+ learners shipping code they actually understand

macOS 12+ · Apple Silicon & Intel · Free & open source

challenge.ts

LIVE DEMO

KodaAI · Mentor

● TypeScript

0 errors Ln 1, Col 1

What do you want to master today? ▋

Loved by learners from

Stanford MIT Y Combinator Recurse Center triplebyte 42 School Lambda Hack Reactor

The Loop

A loop you can feel working.

Three steps. Repeat until the concept clicks. The same loop senior engineers run in their heads — externalised.

01 Pick

teach me binary search trees

Tell it what you want to master

Any topic, any level. KodaAI generates a challenge calibrated to where you are — not where some curriculum thinks you should be.

02 Solve

while (i > arr.length) {

// loop never runs

}

Did you mean <?

Get caught the moment you slip

Every keystroke is read by an AI mentor. Logical errors, conceptual gaps, and lazy patterns get surfaced — not after submit, but mid-thought.

03 Master

Trees 94%

Recursion 71%

Heaps 38%

Watch the pattern stick

The Cognitive Debugger tracks which concepts you own and which still slip — so the next challenge is the one you actually need.

The loop runs in minutes, not weeks — and you can feel the difference by the third session.

Features

Everything you need to actually learn.

Not another AI that writes code for you. An AI that makes you better at writing it yourself.

Beginner Binary Search

Given a sorted array and a target, return its index or -1 if not found. Aim for O(log n).

function binarySearch(arr, target) {'{'}

// TODO

{'}'}

Challenge Engine

Ask for any topic and get a custom coding challenge tailored to your current skill level — no copy-paste answers anywhere.

solution.ts — editing

1for (let i = 0; i

2 while (i > arr.length) {'{'}

3// ...

Wrong direction. > means the loop never runs. Did you mean <?

Live Keystroke Feedback

KodaAI watches every keystroke in real time. Misconceptions get caught and corrected the moment they appear — not after a submit.

Concept mastery

Hash Maps 94%

Sorting 71%

Recursion 43%

Binary Search 28%

Cognitive Debugger

Track your growth over time. See which concepts you own and which ones still slip — so you practice with precision, not repetition.

const seen = new Map()

Stores each value seen so far. Lets us look up the complement in O(1) instead of scanning the array again.

if (seen.has(need))

Complement found. Return immediately — no need to finish iterating.

seen.set(num, i)

Record this number before moving on, so future iterations can find it.

Logic Dissection

Each line of your code links to a plain-English explanation. See exactly why your solution works — or exactly where it breaks.

TypeScript

active

Python

Rust

Java

C++

→ adapts challenges, examples & feedback to the language you pick

Any Language, Any Level

TypeScript, Python, Rust, Go, Java, C++ — KodaAI adapts every challenge and explanation to the language and level you choose.

Positioning

A different category of AI tool.

Copilot writes code for you. LeetCode grades your code. KodaAI is the first AI that teaches you while you write — like having a senior engineer pair with you on every challenge.

What you actually get

KodaAI

The teaching IDE

Cursor / Copilot

AI that writes for you

LeetCode

Grades after submit

Real-time feedback as you type

—

Explains your code, line by line

—

Tracks which concepts you've mastered

—

Generates challenges at your skill level

—

Fixed

Writes the code for you

—

Open source & local-first

—

Different goals, different tools. Use Cursor to ship. Use KodaAI to learn.

Testimonials

People are learning faster.

I'd been using Copilot for two years and still couldn't explain my own code in interviews. Three weeks with KodaAI and I'm finally seeing the patterns.

Maya Chen

Self-taught dev · @mayaships

The keystroke-level feedback is wild. It caught a recursion bug while I was still typing the function — before I even hit save. Felt like pairing with a staff engineer.

Daniel Okafor

CS Junior · Stanford

I prompt-engineered my way through a year of "building." Then I tried to actually read my own code and panicked. KodaAI is the first thing that's slowed me down on purpose.

Priya Ranganathan

Indie founder · @priyabuilds

12,400+

Active learners

340k

Challenges solved

Languages supported

4.9/5

Avg user rating

Pricing

Simple, honest pricing.

Per-user. Start free. Cancel anytime.

Monthly Annually Save 20%

Free

$ 0

/user /month

For individuals getting started.

Get started free

5 sessions per day
20 mentor messages per day
TypeScript & Python
Challenge history (7 days)
Community support

Frequently asked.

Common questions about KodaAI, how it works, and how it compares.

Yes — the Free tier gives you 5 sessions and 20 mentor messages per day, which is enough to build a real daily learning habit. When you're ready to go deeper, Pro unlocks unlimited sessions, all languages, and the full Cognitive Debugger for $25/month.

Copilot and Cursor are productivity tools — they write code so you don't have to. KodaAI is a learning tool — it deliberately does not write your code. Instead, it gives you challenges, watches you solve them, and explains what you got right or wrong. The goal is to transfer understanding to you, not just output to a file.

TypeScript and Python are fully supported at launch. Go, Rust, and Java are available as beta languages on the Pro plan. More are on the roadmap — vote on Discord to prioritize your favourite.

As you type, KodaAI parses your code incrementally using Tree-sitter and sends short context windows to the AI mentor. The mentor checks for logical errors, conceptual gaps, and style issues — not just syntax. Feedback appears inline as annotations linked to the relevant lines.

Yes. Your sessions are encrypted in transit and never stored beyond the current session unless you explicitly save them. We do not use your code to train any models. You can also bring your own Anthropic API key for full control over inference.

Absolutely — it's one of the most common use cases. Ask for challenges by topic (arrays, trees, DP), difficulty, or company tag. The Cognitive Debugger shows you which patterns you've mastered versus where you keep making mistakes.

Free gives you 5 sessions and 20 messages/day with TypeScript and Python. Pro ($25/month) removes those limits, adds all beta languages, full history, and the Cognitive Debugger. Enterprise is for schools and companies — it adds seat management, custom curriculum, per-student reports, SSO, and a dedicated SLA.

macOS is supported at launch (Apple Silicon and Intel). A Windows build is in progress. Linux support is planned. The web version runs in any modern browser with no install required. KodaAI is built on Tauri, so all three desktop platforms share the same codebase.

Still have a question? Ask on Discord

Stop prompting.
Start understanding.

KodaAI is free, open source, and runs locally. Download it, plug in your Anthropic key, and write your first guided challenge in under a minute.

Download for macOS ⌘D Read the source

No credit card required Set up in under 60 seconds MIT licensed

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Vibe coders becomeengineers here.