whatisgithub

What is check-cc?

yacuo/check-cc — explained in plain English

Analysis updated 2026-05-18

★ 190TypeScriptAudience · generalComplexity · 2/5LicenseSetup · easy

In one sentence

A browser tool that checks your system and browser settings for signals that could put your Claude account at risk.

Mindmap

mindmap
  root((CheckCC))
    What it does
      Checks browser environment
      Flags risk signals
      No login required
    Detection signals
      Browser language
      System time zone
      User Agent
      Automation detection
    Tech stack
      Next.js
      React
      TypeScript
    Use cases
      Pre check before Claude signup
      Self hosted deployment
      Learning fingerprinting

Code map

Detail Auto

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filefunction / class

What do people build with it?

USE CASE 1

Check your browser and system environment for risk signals before registering or subscribing to Claude Pro.

USE CASE 2

Verify your setup looks consistent before applying for Claude API access or using Claude Code.

USE CASE 3

Self host the checker on your own server or a platform like Vercel or Cloudflare Pages.

USE CASE 4

Study the code as a learning example of browser fingerprinting and environment detection.

What is it built with?

Next.jsReactTypeScriptTailwind CSSpnpm

How does it compare?

yacuo/check-cckatipally/openlivesirallap/agentglass
Stars190189192
LanguageTypeScriptTypeScriptTypeScript
Setup difficultyeasyeasymoderate
Complexity2/53/53/5
Audiencegeneraldeveloperdeveloper

Figures from each repo's GitHub metadata at analysis time.

How do you get it running?

Difficulty · easy Time to first run · 5min
Use freely for any purpose, including commercial use, as long as you keep the copyright notice and credit the source.

So what is it?

CheckCC is a browser based tool for people who use Claude, the AI assistant from Anthropic. It checks your current browser and system environment for signals that might make Claude flag your account as risky, before you register, subscribe to Claude Pro, apply for API access, or use Claude Code. The tool looks at more than 40 signals such as your browser's language setting, your system time zone, your Intl locale settings, your User Agent string, and whether you appear to be running inside a WebView or an automated browser. It compares these signals against each other and against the region they suggest you are in. If your time zone says one country but your browser language says another, for example, that mismatch is flagged as a possible risk. The project is explicit that none of this proves an account is safe or unsafe. It only helps a user notice obvious inconsistencies in their setup ahead of time. The README gives general advice for lowering risk: keep your IP address, system time zone, browser language, and account region consistent with each other, avoid switching countries, proxies, devices, or browsers frequently, and avoid logging in from WebViews or unstable automated environments. It also states plainly that all checks happen locally in the browser. The tool does not require a Claude login, does not read your Claude account, password, cookies, or chat content, and does not upload results by default. Under the hood it is built with Next.js, React, TypeScript, Tailwind CSS, and pnpm. You can try it live at checkcc.org, or run it yourself with pnpm install followed by pnpm dev, then open localhost:3000 in your browser. A production build uses pnpm build and pnpm start. The README notes it can be deployed to Vercel, Cloudflare Pages, Netlify, or your own server. The project is released under the MIT license. If you build on it or redeploy it, the README asks that you keep the original copyright notice and link back to the source repository. The maintainers describe an upcoming desktop app for macOS, Windows, and Linux meant to help fix environment issues directly, currently in private testing.

Copy-paste prompts

Prompt 1
Explain what environment signals CheckCC checks and why each one matters for account risk.
Prompt 2
Help me deploy CheckCC to Vercel using the instructions in its README.
Prompt 3
Walk me through running CheckCC locally with pnpm install and pnpm dev.
Prompt 4
Summarize CheckCC's privacy claims about what it does and does not read from my browser.

Frequently asked questions

What is check-cc?

A browser tool that checks your system and browser settings for signals that could put your Claude account at risk.

What language is check-cc written in?

Mainly TypeScript. The stack also includes Next.js, React, TypeScript.

What license does check-cc use?

Use freely for any purpose, including commercial use, as long as you keep the copyright notice and credit the source.

How hard is check-cc to set up?

Setup difficulty is rated easy, with roughly 5min to a first successful run.

Who is check-cc for?

Mainly general.

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