Easily track and manage all your subscriptions in one place.
SubStack is a free browser extension that helps young professionals aggregate and monitor their recurring subscriptions from a single dashboard. Users can manually add subscriptions, set monthly budgets, receive renewal reminders, and view spending trends. All data is stored locally in the browser for privacy. The extension is built with simple HTML/CSS/JavaScript, making it easy to develop and maintain. Revenue is generated through optional premium features like CSV export, unlimited subscription slots, and personalized savings recommendations. The business operates on a freemium model, with the core features free and a one-time fee for premium. With minimal time investment (1-2 hours per week for updates and promotion), this side hustle can generate passive income from a growing market of subscription-fatigued consumers.
Subscription fatigue is at an all-time high among young professionals, and existing solutions are either too heavy (full budgeting apps) or too manual (spreadsheets). A lightweight, privacy-focused extension fills a clear gap.
Create a basic Chrome extension manifest and popup HTML file using free tutorials from Chrome Developer docs.
Young professionals aged 22-35
Freemium: Core extension is free with ads (or donation). Premium upgrade ($4.99 one-time) unlocks unlimited subscriptions, CSV export, and ad-free experience. Acquisition via Chrome Web Store SEO, personal finance blogs, and social media (Reddit, Twitter). Lifetime value is low but margin high due to zero hosting costs.
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