Web Extension Lab

SubWatch: Track Your Subscription Spending with a Privacy-First Chrome Extension

March 11, 2026

SubWatch is a Chrome extension that gives you a clear overview of your subscription costs — monthly totals, category breakdowns, and upcoming renewals — all without sending your financial data anywhere. Available now on the Chrome Web Store.

The Problem

Subscriptions add up. A streaming service here, a SaaS tool there, a cloud storage plan you forgot about. Most people underestimate how much they spend on recurring charges because the costs are spread across multiple billing dates and currencies.

Spreadsheets work, but they require manual upkeep. Dedicated finance apps often want access to your bank accounts. SubWatch takes a different approach: a lightweight tracker that lives in your browser toolbar, keeps everything local, and shows you the numbers that matter.

How It Works

1. Click the SubWatch icon in your toolbar
2. Add your subscriptions — name, amount, billing cycle, category, and next renewal date
3. View your dashboard for monthly and yearly totals, a category breakdown chart, and upcoming renewals

Dashboard — spending totals, category breakdown, and upcoming renewals

Add a subscription — name, amount, cycle, category, and renewal date

Subscription list — all your tracked subscriptions at a glance

Key Features

• Monthly & yearly totals — see exactly how much you spend on subscriptions
• Category breakdown — visual pie chart for spending by category (Streaming, Software, Gaming, Music, Cloud, and more)
• Upcoming renewals — a clear list of what renews next so you are never caught off guard
• 7-currency support — USD, JPY, EUR, GBP, KRW, CAD, AUD with locale-aware formatting
• Privacy-first — all data stored locally in your browser, no external servers

Free vs Pro

The free tier supports up to 5 subscriptions with full dashboard functionality — enough to get started and see the value. Pro ($2.99, one-time purchase) unlocks unlimited subscriptions, renewal reminder notifications (2 days before each renewal), and multi-currency selection across all 7 supported currencies.