Crypto Price Alert — Bitcoin, Ethereum & Altcoin Tracker with Portfolio

About

Crypto Price Alert is a lightweight Chrome extension that keeps you in the loop on cryptocurrency prices — without leaving your browser.

Set your own price targets and get a native browser notification the moment a coin hits them. Track your portfolio and see your real-time P&L at a glance. Everything runs locally in your browser — no account, no sign-up required.

━━━ CORE FEATURES ━━━

📈 Live Price Tracker
• Real-time prices for any CoinGecko-listed coin
• 24h change shown for each coin with trend indicators
• Search and add any cryptocurrency instantly
• Free tier: track up to 5 coins

🔔 Smart Price Alerts
• Set alerts above or below any price target
• Percentage-based alerts (e.g. "alert me when BTC drops 10%")
• Recurring alerts — keeps firing every time the price crosses your target
• One-shot alerts — fires once, stays in triggered state until you re-arm it
• Badge counter on the extension icon shows how many alerts are active
• Free tier: up to 5 alerts

💼 Portfolio Tracker
• Add coin holdings with optional cost basis (price paid per coin)
• Live total portfolio value updated in real time
• 24h portfolio P&L (dollar and percent)
• All-time P&L calculated from your cost basis
• Free tier: unlimited portfolio entries

🌡️ Market Sentiment
• Fear & Greed Index shown on the Prices tab
• Ethereum gas price indicator

⚡ Technical
• Manifest V3 — the modern, future-proof extension standard
• Background service worker checks prices every minute using Chrome Alarms API
• All data stored locally in chrome.storage — nothing is sent to any server
• No tracking, no analytics, no third-party data collection

━━━ FREE vs PREMIUM ━━━

Free:
  • Up to 5 tracked coins
  • Up to 5 active alerts
  • Full portfolio tracking

Premium (one-time payment — $1 USDC):
  • Unlimited coins
  • Unlimited alerts
  • All future updates included