yacuo/check-cc

What it solves

CheckCC is designed to help users avoid account bans, restrictions, or subscription failures when using Claude (Web, Pro, API, and Claude Code). It identifies environmental conflicts—such as mismatches between IP address, system timezone, and browser language—that could trigger risk flags for Anthropic's security systems.

How it works

The tool analyzes over 40 environmental dimensions through client-side sampling and server-side request analysis. It checks for consistency across several key signals:

• Browser and System Settings: Validates if the browser language, system timezone, and JavaScript Intl Locale match the intended region.
• Identity Markers: Analyzes the User-Agent to identify the browser, system, and client container.
• Environment Detection: Detects the presence of WebViews, automation environments, or abnormal client containers.
• Signal Consistency: Aggregates these markers to determine if the environment profile is contradictory (e.g., using a US IP but a Chinese timezone).

Who it’s for

Users who are registering for Claude accounts, subscribing to Claude Pro, applying for Claude API access, or using Claude Code who want to ensure their running environment is "clean" and low-risk before logging in.

Highlights

• Comprehensive Detection: Covers 40+ environmental signals to identify risk factors.
• Privacy-First: Does not require Claude login, does not read passwords, cookies, or chat history.
• Multi-Platform Support: Built with Next.js and React for a responsive UI.
• Self-Deployable: Can be deployed via Vercel, Cloudflare Pages, or Netlify for personal use or secondary development.