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
RankingCheck: App Rank Tracker
Hi, I’m Rey
$3.99 · In-app purchases
PRICE
$3.99
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 RankingCheck: App Rank Tracker: map the core Developer Tools 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
Implement batch tracking features to monitor multiple apps simultaneously.
Assumption to check: Limited functionality for tracking multiple apps at once
Validate with people who use this workflow before building.
Hypothesis 2
Provide comprehensive analytics and insights to users on app ranking trends.
Assumption to check: Lack of detailed analytics on app performance
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to set custom notifications based on specific ranking changes.
Assumption to check: No customizable notifications or alerts
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline tracking and data caching for uninterrupted access.
Assumption to check: No offline functionality
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
Hi, I’m Rey I built RankingCheck as an indie developer to solve a simple problem: tracking app rankings across countries shouldn’t be slow, manual, or limited. So I built a tool that gives you real global visibility, without switching regions or relying on complex ASO platforms. WHAT YOU CAN DO Global Search Find any app and instantly see where it ranks across 170+ countries and 26 categories. Go deeper with extended multi-country scanning. Real-Time Rankings Always see what’s live. Rankings are refreshed frequently so you can track movement as it happens. Track Your Apps Add your app in one tap and monitor its performance over time across multiple countries. Ranking History Visualize trends and understand how your app moves in the charts. Competitor Comparison Compare your app with up to 4 competitors and see who’s rising or falling. Top Movers Spot rising and falling apps in real time across your tracked countries. Instant Alerts Get notified when your app enters the Top 50, Top 10, or makes significant jumps. ASO Keywords Analyze any app’s keyword strategy. Extract keywords from title, subtitle, and description. Daily Rankings Discover trending apps every day from different countries and categories. Home Screen Widgets Keep your most important rankings visible at all times with live widgets, including Top Movers. Share Your Ranking Generate clean, shareable ranking cards for social media in one tap. Built by an indie developer, for developers who want real control over their app’s performance.
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
Axios
Chart.js
AsyncStorage
React Navigation
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.
