copatcher

Tired of AI breaking your code?

You know the drill: Ask AI for a "small change" and suddenly half your project stops working. Copy-paste chaos between your IDE and ChatGPT. Projects that never get finished because keeping track of changes becomes impossible.

Tired of projects falling apart when they get complex? When I built my math suite 1234MATH, step-by-step control was essential. The codebase and game logic were too intricate to risk breaking existing features.

Sick of AI-generated looking websites? Custom design iterations were crucial for my AI-enhanced music show room Studio5AI because I needed unique interfaces, not cookie-cutter templates that scream "ChatGPT made me."

Managing full-stack chaos? My vibe code playground for kids 94HQ.com required surgical precision because frontend and backend changes couldn't break each other. Complex architecture demands controlled modifications.

This very website was built using Copatcher. Notice how it doesn't look like every other AI landing page? That's the power of precise, iterative control.

No more "oops I broke everything."

Three steps. Zero chaos.

1. Upload your code + LSD.pdf to the LLM (Claude and Gemini are the best). The LSD guide teaches them to speak Copatcher. Your code goes to the AI, but Copatcher stays local on your desktop.

2. Ask for changes as Copatcher patches
"Fix this bug as a patch." "Add this feature as a patch." The AI returns surgical instructions in artifacts: FIND this exact code, REPLACE with this, END. No guessing where it goes.

3. Copy → Patch → Save
Hit the "Patch" button to apply changes copied directly from artifacts. Your code gets precisely modified, automatically copied to clipboard. Copatcher saves your file with one click - it's like an IDE-light. Marvel at how nothing else broke.

That's it. No more "where does this 50-line function go?" No more accidentally deleting half your CSS. No more copy-paste archaeology between 12 browser tabs.

The AI becomes your precise assistant instead of a code-destroying chaos monkey. Your projects actually get finished instead of endlessly restarted.

Fearless coding achieved.

Copatcher 2.2 - Always FREE Download

Windows 10/11 | 42MB | Ready to run

When I started making Copatcher, I figured it might soon be obsolete. Or that I was the only one struggling. I never figured anyone else would need it. (I'm still not sure about that.)

Back then, I didn't know a thing about writing code. But in the small context window, around 3–400 lines when using Claude, I made a simple game. I called it Sp4cew4ys. Pretty good name, I think. A Tetris game that moves in four directions with original block shapes.

When coding with AI, my problem was pasting the code at the right place, and I needed a way to enlarge the codebase. To make the code longer without starting over every time. Copatcher did this, and it wasn't until later I found out it could fix the bugs for me too.

Feels like a long time ago now. That first Copatcher was so basic. It felt dumb. Nevertheless, my enjoyment of Copatcher is greater than ever. I hope you'll enjoy it too, and maybe find your own use for it. It might just be a small part of something bigger.

Make code changes without the chaos and paranoia.

Upload your code and LSD.pdf to your AI (Claude works best for me). Discuss the project and ask for changes as patches for Copatcher.

Instead of search-and-replace chaos, you get controlled, precise modifications. Your code stays intact except for exactly what you specify. No surprises, no side effects, no "oops I broke something else."

This is debugging without the fear. Code modification without the panic. Precision without the paranoia.

The technique and structure of the patches:

FIND (exact code to locate) - REPLACE (what goes there instead) - END (marks completion).

Copy the patch from the AI to Copatcher. Inject it to your code. The new code is now on your clip board and you can paste it to your IDE.