Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
App Overview
Simple Subscription Tracker
SubTrack - Subscription Manager
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Differentiate and validate
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Simple Subscription Tracker: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Include reminders and alerts for upcoming billing dates.
Assumption to check: Users often forget to cancel subscriptions before renewal dates.
Validate with people who use this workflow before building.
Hypothesis 2
Provide a comprehensive report and visualization of spending.
Assumption to check: Difficulty in tracking spending across multiple subscriptions.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to categorize subscriptions for better organization.
Assumption to check: Lack of categorization for subscriptions.
Validate with people who use this workflow before building.
Hypothesis 4
Design a clean and simple interface for easy navigation.
Assumption to check: Complex user interface can be overwhelming.
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
SubTrack - Subscription Manager Take control of your subscriptions with SubTrack, a privacy-first subscription tracker. Manage all your services, track spending, and never miss a renewal—all while keeping your data secure and private. One-time purchase, no subscriptions SubTrack is a one-time purchase with no ongoing costs, subscriptions, or hidden fees. Pay once and use it forever. 100% offline and private Your data stays on your device. No cloud sync, no tracking, no data collection. Works completely offline—no internet required after installation. Your subscription information never leaves your device. Features: Track subscriptions and free trials in one place Smart renewal reminders before billing dates Spending insights: monthly and yearly totals with category breakdowns Convert expired trials to paid subscriptions Export/import your data as CSV or JSON Customizable themes (Light, Dark, System) Multiple currency support Organize by categories (Streaming, Music, Software, etc.) Privacy-first design Built with privacy in mind. No accounts, no servers, no analytics. Your subscription data belongs to you and stays on your device. Simple and intuitive Clean interface to add, edit, and manage subscriptions. See what's renewing soon, track spending, and stay organized. Download SubTrack today and take control of your subscriptions—privately, securely, and without ongoing costs.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Expo
Supabase
Zustand
react-native-chart-kit
BUILD KIT DIFFICULTY
Intermediate
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.
