Codeplainer

You built it with AI. Now understand it.

Your personal code trainer: daily sessions on your own codebase, with voice walkthroughs, hands-on practice, and progress you can see. Turn vibe coding into real engineering.

A personal trainer, not another chatbot

Explanations alone don't make you an engineer. Doing the reps does - and your trainer makes you do them.

Daily Training Sessions

A 15-minute guided loop on your own code: review, walkthrough, predict, and a hands-on task

Voice Walkthroughs

A trainer talks you through your code while the exact lines light up in the editor

Hands-On Practice

Every session ends with "your turn" - modify real code and get reviewed like a junior dev

Predict Before You Touch

Answer "what happens if...?" questions that build the mental model real engineers have

A Memory of You

Concepts you learn come back for review at the right time - spaced repetition on your own codebase

Progress You Can See

Watch concepts move from seen to practiced to mastered, and keep your training streak alive

From vibe coder to software engineer

Fifteen minutes a day on your own codebase. Get started in seconds.

01

Import your code

Connect your GitHub repo or paste code snippets. Works with any project or language.

02

Train daily

A 15-minute session: recall, voice walkthrough with live highlights, predict, then modify the code yourself.

03

Become the engineer

Concepts move from seen to practiced to mastered. Debug your own app. Ship with real understanding.

Optimized for modern web projects

Codeplainer works best with repositories that matter most to indie developers and startups

Small Projects

Under 50 files

  • Simple Express APIs
  • Basic React apps
  • CLI tools
  • 100% coverage

Medium Projects

50-200 files

  • Next.js / React apps
  • Full-stack SaaS projects
  • NestJS / Express APIs
  • Excellent results

Large Projects

200-500 files

  • Complex dashboards
  • Multi-service backends
  • Enterprise apps
  • Focused questions

Built for the AI-coding era

Real ways builders use Codeplainer to stop being passengers in their own codebase

Understand what your AI just wrote

Cursor, Claude, or Lovable built it - now actually know how it works

Debug your own app

Stop being helpless when it breaks. Learn to diagnose instead of re-prompting

Onboard to any codebase

New job or open source project - train on it until it feels like yours

Read code fluently

Build the skill that separates prompt operators from engineers

Think in systems

See how components connect and how data flows through your app

Retain what you learn

Spaced review means concepts stick instead of evaporating after the tutorial

Your first session takes 15 minutes.

Keep building with AI - and become the engineer who understands every line of it.