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
Charger Master Pro
The charging sound is now online, making you the brightest boy in the village instantly! Charging sound, unplugged sound, full battery sound, low battery sound, there is always one that belongs to you~
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
156 ratings · Top 30%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Charger Master Pro: map the core Reference 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
Provide extensive notification settings and customization.
Assumption to check: Limited customization options for charging notifications
Validate with people who use this workflow before building.
Hypothesis 2
Implement interactive charts with detailed insights.
Assumption to check: Poor data visualization for statistics
Validate with people who use this workflow before building.
Hypothesis 3
Create a more intuitive history browsing experience.
Assumption to check: Difficult to access historical data quickly
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance for a wider range of devices.
Assumption to check: Inconsistent performance across devices
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
The charging sound is now online, making you the brightest boy in the village instantly! Charging sound, unplugged sound, full battery sound, low battery sound, there is always one that belongs to you~ New function of charging play, carefully design a number of exquisite animations, reject the fuzzy mosaic animation, bring different charging experience. New feature of automatic charging test is comming. After connecting to the charging cable, the Charger Master Pro can automatically start the test without manually opening the APP. In [Tools-Automatic charging test], you can view the detailed tutorial~ (iOS14 system required). Charger Master Pro will be a good companion for your charger. It uses a well-designed algorithm and has been tested by many users for tens of thousands of times. It can quickly and accurately measure the charging power of your device and help you find the best charger. 【FEATURES】 1. Detect the charging power of the current device. 2. Charging display, charging sound. 3. View the charging time, capacity, speed and other parameters of your charger. 4. View the current device's adapter charger, PD fast charging power, wireless charging power and other parameters. 5. Record detailed test results, and can set test charger to facilitate retrospective. 6. Support to add custom charger model, power, brand and interface. 7. Battery life calculator can estimate battery life based on capacity and power consumption. 8. The charging calculator can estimate the time required to fully charge the battery. 9. Battery capacity conversion can quickly convert watt-hours and milliamp-hours. 10. Battery maintenance tips can help you better extend battery life. 11. Hundreds of thousands of HD animations and wallpapers have been launched. 12. Well-designed home screen widgets to make your desktop look new
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
Victory Native
React Navigation
React Native Async Storage
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.
