SubSentry

SubSentry is a privacy-first subscription waste detector designed to empower users to manage their subscriptions effectively. This tool goes beyond basic expense tracking by not only providing insights into payment amounts but also evaluating actual usage and renewal statuses, enabling users to make informed decisions about their subscriptions. With its comprehensive features, SubSentry allows users to keep track of their financial commitments and identify potential wasteful subscriptions.

Key Features

Deterministic Waste Score

• Score Range (0-100): The score is fully explainable with four key components: usage, cost, renewal risk, and usage trend. Each component contributes to an overall score, allowing users to easily identify subscriptions worth reviewing.
• Waste Bands: Scores are segmented into bands, helping users categorize their subscriptions—0–30 (Healthy), 31–60 (Monitor), 61–80 (Potential Waste), 81–100 (High Waste).

Usage Tracking

• Users can manually log usage sessions for each subscription, enabling a clear view of actual usage compared to costs incurred.

Renewal Reminders

• SubSentry provides scheduled reminders for upcoming renewals, ensuring users never miss important dates, while archived subscriptions are kept out of mind.

Cost Calculation

• The tool accurately calculates both monthly and yearly costs, taking into account varying billing cycles, ensuring users are aware of their total financial commitments.

CSV Import

• A flexible CSV import feature allows users to easily migrate existing subscription data, handling duplicates and missing information with ease.

Privacy-Centric Design

• SubSentry stands firm on privacy, not requiring any bank credentials or card numbers. Users remain in control of their data, with options to export or delete personal information as needed.

Cross-Platform Accessibility

• Built using Expo and React Native, SubSentry offers a seamless experience across web and mobile platforms, providing accessibility and convenience for users.

Tech Stack

SubSentry operates on a robust technology stack with:

• Backend: FastAPI (Python)
• Database: PostgreSQL (SQLite for local development)
• Frontend: Expo React Native (TypeScript)

Project Architecture

The architecture is designed for scalability and performance:

Expo React Native (Web now · Mobile later)
                  |
                  v
            FastAPI Backend
                  |
         +--------+--------+
         |                 |
    PostgreSQL          Redis (optional)

SubSentry not only facilitates better management of subscriptions but also enhances users' financial awareness by providing detailed insights and tools that promote informed decision-making. The project aims to simplify subscription management while prioritizing user privacy.