3,400+ Weekly Installs / Local Runtime v1.3.32 / 100% On-Device

Stop Cursor & Claude from
Breaking Other Files When Fixing 1 Bug.

CortexOS runs on your machine (localhost:9000). Press Ctrl + J in your browser to lock any live UI component, intercept console errors, and generate 1-shot surgical context packets engineered for zero regressions.

$ npx cortexos-runtime :9000

route See Complete Workflow arrow_forward

✓ React 18 & 19 Support ✓ Next.js App Router ✓ Vite & Tailwind ✓ Cursor, Claude, Antigravity & Lovable ✓ 100% Air-Gapped Localhost

warning The Fatal Blindspot of AI Coding

Why AI Coding Agents Break Feature 1
Every Time They Build Feature 2

Whether you use Cursor, Claude Code, Copilot, or ChatGPT, every AI coding assistant suffers from the exact same fatal blindspot: they only see dead files on disk, completely blind to your live running browser.

sync_problem

1. The Infinite Regression Loop

AI writes Feature 1 (works). AI writes Feature 2 (works, but breaks Feature 1's imports). AI tries to fix Feature 1 (breaks Feature 2). Developers spend 80% of their time untangling broken multi-file edits instead of shipping.

verified CortexOS Consumer Matrix stops this before generation.

visibility_off

2. Blind to Live Browser DOM

Your IDE agent cannot see what is rendered in Chrome. It hallucinates button selectors, guesses stale Redux state, and cannot see live HTTP 402/500 network exceptions streaming in the browser console.

verified Cortex Lens snaps DOM coordinates & live state with Alt+D.

code_off

3. Destructive Full-File Rewrites

To change 3 lines of CSS or a single fetch call, AI agents frequently rewrite 500-line files, silently erasing existing state, auth tokens, and defensive null guards you wrote days ago.

verified 7 Inviolable Protocols enforce minimal surgical line diffs.

rocket

The Solution: Build Any Startup in 7 Days with Zero Regressions

Pin CortexOS Vision over your IDE while coding. Open CortexOS Lens in your browser to debug. 1 command, 100% on-device.

verified Ground-Truth Developer Proof

Two Ways to Experience CortexOS

Experience the interactive developer simulator on the left, or watch the real unedited 56-second screen recording with continuous autoplay on the right.

lock http://localhost:5173/dashboard | Vite v5.4

warning "AI CODING AGENT FIXED ONE BUG, THEN BROKE THREE OTHERS"

Screen Recording Cut

radar CORTEX VISION DIAGNOSTIC

⚡ 60 FPS ✓ Invariants ◎ GPS ✕

ACTIVE [AUTO-REVERT ARMED]

wifi_tethering NETWORKING

CORTEX-AI

filter_center_focus VISUAL TARGETS (0) MULTI-RETICLE

No target locked. Click Revenue Ledger card →

REALTIME TELEMETRY

TypeError: Cannot read properties of undefined (reading 'reduce')

> TACTICAL DIRECTIVE (BUG INPUT): Context Anchor

Click <RevenueLedger /> or hit Autoplay... |

dashboard Financial & Ledger Dashboard

Port 9000 Runtime Service

Monthly Revenue +14%

₹48,290

Verified Sessions

API Latency 28ms

99.98%

Compositor 60 FPS

<RevenueLedger /> src/components/RevenueLedger.tsx

CRASH L24

₹0 Settled Revenue

Uncaught TypeError: Cannot read properties of undefined (reading 'reduce')
at RevenueLedger.tsx:24:28 • Hierarchy: <Dashboard> → <RevenueLedger>

Lock element to sync with Cortex Vision HUD Alt + D Snap

psychology COMPILED CONTEXT PACKET Universal Diagnostic Intelligence Core

verified All 6 Channels Sealed (1,840 tokens)

pin_drop 1. GPS LINE OF CODE [L20-30]

src/components/RevenueLedger.tsx

22 | const { settlementLedger } = data;

23 | const total = settlementLedger.reduce(...);

24 | return <div className="revenue">...</div>;

✓ Ground-truth verified on local disk

code 2. LIVE DOM & HTML DOM Snapped

<div class="targetable-card revenue-card"
  data-element-id="el_7894">
  <span class="badge">CRASH L24</span>
  <div>₹0 Settled Revenue</div>
</div>

Live DOM geometry coordinates synced

error 3. RUNTIME EXCEPTION Crash L24

TypeError: Cannot read reduce of undefined

• at RevenueLedger.tsx:23:28

• at renderWithHooks (react-dom.js:15486)

• at mountComponent (react-dom.js:20103)

Console & unhandled rejections captured

swap_vert 4. HTTP GET/POST 200 OK (84ms)

GET /api/v1/ledger/settlements?range=30d

Payload: {"settlementLedger": null, "currency": "INR"}
Root Cause: Backend null returned instead of []

Network telemetry payload intercepted

schema 5. DATA SCHEMA TypeScript

interface RevenueDataContract

interface RevenueData {
settlementLedger: Array<Item> | null;
totalRevenue: number;
}

Schema nullability contract enforced

shield 6. PROTECT FEATURES Safe-State

2 Downstream Consumers Protected:

• ✓ Protected: billingService.ts

• ✓ Protected: analyticsEngine.ts

• Invariant: (settlementLedger || []).reduce()

npx tsc --noEmit: Exit Code 0 Invariant

auto_awesome All 6 Ground-Truth Context Channels Sealed • Ready for Claude / Cursor

Click <RevenueLedger /> or hit Autoplay to start

Interactive mode active: Click cards or test Ctrl+J

Real Screen Recording (0:56 Uncut)

Continuous Autoplay

play_circle Jump to Proof Moments: Click pill to seek video

WORKFLOW: Ctrl+J → Snap Card → Detailed Context → Surgical Diff

Open Full HD Video open_in_new

view_in_ar Core Architecture

The 4 Deterministic Senses

Standard AI assistants are blind to the browser. CortexOS provides four physical sensory inputs so Cursor and Claude never guess.

visibility

The Eye Ctrl + J

Snaps directly to any UI element. Extracts exact component hierarchy, runtime props, and CSS styling without altering page styling.

hearing

The Ear Live Stream

Intercepts uncaught rejections, console.error, and failing HTTP REST/GraphQL calls (4xx, 5xx) in real time with exact stack traces.

HTTP 500: POST /api/settlement

psychology

The Brain Impact Matrix

Local dependency intelligence maps all downstream consumers. Formulates the Safe-State Impact Horizon so fixing 1 file never breaks 3 others.

4 Downstream Consumers Protected

near_me

The GPS Ground Truth

Extracts verified disk slices and exact line ranges (L12-48). Zero hallucinations, zero phantom imports, and strict TypeScript gate.

Disk Slice: RevenueLedger.tsx [L12-48]

compare_arrows Real-World Benchmark

Why AI Assistants Fail (And How CortexOS Fixes It)

See the difference between sending vague manual prompts and injecting a CortexOS Smart Context card into Cursor, Claude, or ChatGPT.

cancel Without CortexOS Multiple Retries Needed

// Developer manual prompt:

"Hey, my checkout button isn't working and says undefined, here is some code. Also the styles look broken on mobile."

close Hallucinated Imports: AI invents libraries or functions that do not exist in your project.

close Wiped Styles & Handlers: AI rewrites the entire file, accidentally dropping custom CSS and event props.

close Unintended Breakage: Changing one component silently breaks two other screens in your app.

Average Fix Time: 45 Minutes UNSTABLE RESULTS

verified With CortexOS Smart Context 1-Click Verified Fix

[CORTEXOS VERIFIED CONTEXT PACKET]

Target: CheckoutModal.tsx [Line 42]

Captured Issue: Unhandled Null Exception (sessionToken)

Impact Analysis: Protected 4 connected pages

Safety Check: Targeted 4-line patch only

check_circle Zero Regressions: Modifies only the required lines. Existing animations and styles stay untouched.

check_circle Works on First Attempt: With real runtime context, your AI writes code that immediately runs.

Deterministic Grounding

route Effortless Workflow

How CortexOS Works in 3 Steps

No browser extensions. No complex cloud setup. Just run the local CLI tool.

01 LOCAL ENGINE

Launch in Terminal

Run npx cortexos-runtime in your project folder.

> Local Engine started on :9000

> Smart Context ready

> Ready for targeting [OK]

Zero dependencies added to your project.

02 CTRL + J

Click to Target

Press Ctrl + J inside your live web page to lock onto the broken element.

> Target locked: <CheckoutModal />

> Runtime error ingested

> Impact analysis confirmed

Inspect components and capture runtime errors in 1 click.

03 1-SHOT FIX

Paste & Fix

Paste the generated Smart Context card into Cursor, Claude, or ChatGPT for an immediate clean fix.

> Context copied to clipboard

> Surgical fix prepared

> Zero side-effects enforced

Deterministic source coordinates eliminate multi-file trial & error.

lock Private & Air-Gapped by Default

Your Code Never Leaves Your Machine

CortexOS operates entirely on your workstation. No proprietary code, database credentials, or environment secrets are ever sent to remote servers or cloud vector stores.

laptop_chromebook Runs 100% On-Device

The engine binds only to localhost. No telemetry collectors or external indexing databases.

verified_user Zero Cloud Storage

All analysis is completed in temporary memory with zero persistent tracking.

Security Checklist shield VERIFIED LOCAL

Outbound Code Uploads: 0.00 Bytes

Cloud Database Sync: DISABLED

Execution Mode: 100% Localhost

Compliance: Air-Gap Compatible

Fully compliant with strict enterprise air-gap requirements.

psychology The Super Prompt Difference

Why a Super Prompt Cannot Be Made by Hand

A prompt is not just English text. It is a live-grounded diagnostic telemetry order that feeds your AI the real-time memory and coordinates needed for a 1-shot fix.

Telemetry Dimension

cancel Standard Manual AI Prompts

check_circle CortexOS Super Prompt

crop_free 1. Live DOM & Exact Source Lines

Standard AI Prompt: Blind to browser DOM; guesses components from filenames.

CortexOS Super Prompt: Snaps exact DOM coordinates, sub-millimeter CSS, and physical file line slices [L1-80].

wifi_tethering_error 2. Runtime Errors & REST API Calls

Standard AI Prompt: Misses failing background REST API calls (4xx/5xx) and console error traces.

CortexOS Super Prompt: Auto-intercepts failing GET/POST network payloads, HTTP status codes, and unhandled rejections.

database 3. Database Schema & SQL Integrity

Standard AI Prompt: Hallucinates column names and writes broken SQL migrations.

CortexOS Super Prompt: Grounds queries against verified active table definitions and column constraints on disk.

hub 4. Fullstack Frontend-to-Backend Flow

Standard AI Prompt: Breaks backend-frontend contracts; invents mismatched JSON response structures.

CortexOS Super Prompt: Traces end-to-end integration contracts so API parameters stay mathematically aligned.

security 5. Code Isolation & Safety Shield

Standard AI Prompt: Rewrites 400 lines indiscriminately, breaking other features across the app.

CortexOS Super Prompt: Locks working code and builds a strict no-touch boundary shield around unaffected files.

payments Transparent Pricing

Simple, Deterministic Plans

Start free with no credit card. Upgrade when you need unlimited high-throughput debugging.

Localized Pricing Enabled • Razorpay Secure Checkout

Developer Starter

Perfect for trying out on-device UI targeting.

₹0 / Free Forever

Included Capabilities

check 10 Bug Fix Runs / month
check Instant Component Targeting (Ctrl + J)
check Local Live Error Snapping
check Standard Community Support

Frequently Asked Questions

Everything you need to know about local execution, air-gap security, and zero-regression context packets.

01 Does CortexOS require an IDE extension or browser plugin? expand_more

No. CortexOS requires zero extensions, zero plugins, and zero custom IDE configuration. You run a single command (npx cortexos-runtime) in your project terminal. It spins up a local diagnostic service on localhost:9000 and monitors your local web server. Pressing Ctrl + J locks onto UI elements in any standard browser.

02 Does my proprietary code or database credentials get uploaded to the cloud? expand_more

Never. CortexOS is engineered from the ground up as a 100% on-device air-gapped system. Code parsing, component tree inspection, and downstream dependency mapping execute entirely in local memory on your machine. We never transmit, store, or train public AI models on your codebase or environment credentials.

03 How does CortexOS prevent AI from breaking other files (Zero Regressions)? expand_more

Standard AI code assistants suffer from "context myopia"—they only see the file you have open and guess at external dependencies. CortexOS maps your local AST dependency graph to formulate a Safe-State Impact Horizon, identifying every file and service consuming the target component. It locks boundaries around unaffected code and enforces defensive property guards ((items || []).map(...)), ensuring fixes are strictly isolated to the bug coordinate.

04 Which AI coding tools and frameworks are supported? expand_more

CortexOS outputs universal, deterministic context packets formatted for Cursor IDE, Claude Code, Antigravity, Lovable, Replit Agent, Bolt.new, v0 by Vercel, GitHub Copilot, Windsurf, and ChatGPT. It natively supports React 18 & 19, Next.js (both App and Pages Router), Vite, Tailwind CSS, TypeScript, and modern vibe-coding workflows.

05 How does the Free plan compare to Developer Pro? expand_more

The Developer Starter plan is free forever with zero credit card required, including 5 full 1-shot diagnostic runs per month. Developer Pro provides unlimited 1-shot Super Prompts, live state and active data snapping, the Live CSS Staging Studio, and multi-file boundary locks for ₹999/month ($12/mo).

Zero-Config Drop-in Integration Across Modern Ecosystem

Next.js 15

React 19

Vite

TypeScript

TailwindCSS

Cursor

Claude Code

Antigravity

Lovable

Replit

Bolt.new

v0 by Vercel

terminal Instant Integration

Works with Your Entire Modern Stack

Run one command across any React, Vite, or Next.js repository in less than 300 milliseconds.

$ npx cortexos-runtime

No credit card required • Runs 100% on localhost • Instant 1-shot fixes

Stop Cursor & Claude from Breaking Other Files When Fixing 1 Bug.

Why AI Coding Agents Break Feature 1 Every Time They Build Feature 2