Automatic detection

When you land on a payment or subscription page (Netflix, Canva, etc.), TrialGuard scans visible text for trial keywords—"free trial", "7 days", "1 month free"—and shows a lightweight popup in the top-right corner.

One-click reminder

Tap "Set reminder" and TrialGuard calculates your cancel-by date: trial length minus one safety day, then creates a Google Calendar event you approve.

Google Calendar sync (MVP)

On cancel-by day, your phone and desktop get the calendar alert you already rely on — even when Chrome is closed. Example: "[Cancel] Canva free trial ends tomorrow."

• Events created via Google Calendar API only after you connect your account
• Smartphone push through the Google Calendar app — no Chrome notification permission needed

Dashboard in the toolbar

Click the extension icon to see every active trial, days until billing, and quick links to each service. Trials sync via chrome.storage.sync across signed-in Chrome profiles.

Smart date calculator

Detected duration (7 / 14 / 30 days, etc.) is added to today's date, then one day is subtracted so you always get a buffer before the charge hits.

Coming in V2

• Direct cancel URLs for Netflix, Adobe, and other major services
• Monthly savings counter for easy sharing
• Notion integration for power users

Technical approach

• Content script: reads page text only on checkout-like pages (card fields, "subscribe", "free trial")
• Service worker: Google Calendar API for event creation after OAuth consent
• Storage: trial list in chrome.storage.sync — no developer server for trial data