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
Toolbox™
iMetalBox is the most elegant and handy toolkit ever created for your iPhone
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
4,280 ratings · Top 15%
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 included17 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 Toolbox™: map the core Utilities 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
Add more tools and functionalities to enhance user experience.
Assumption to check: Limited feature set compared to full-fledged tools
Validate with people who use this workflow before building.
Hypothesis 2
Implement rigorous testing and user feedback loops.
Assumption to check: Occasional bugs in tool usage
Validate with people who use this workflow before building.
Hypothesis 3
Add iCloud sync to improve user data management.
Assumption to check: No iCloud sync for settings and history
Validate with people who use this workflow before building.
Hypothesis 4
Implement dark mode for better accessibility and user comfort.
Assumption to check: No dark mode support
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
iMetalBox is the most elegant and handy toolkit ever created for your iPhone. Get 12 professional tools for the price of one! -------------------------------- User reviews: • "Nicely done ! Clever design and a must have for all. " - Dr5000 • "Pretty much any useful utility you'll need." - kfduv • "Versatile, functional, and easy to use." - MuzikGawd • "I love how the flashlight can be turned on as the first thing and that the light can be dimmed." - Reitveld • "This is my go to device for flashlight, stopwatch, levels, and it even has a built-in ruler." - grailpuffin • "Best compact app ever. It is very useful apps for daily use" - tinymoon -------------------------------- • Flashlight The brightest, fastest and most advanced flashlight for iPhone. It contains a compass and the brightness is adjustable. • Magnifier Transforms your phone into a magnifying glass with light. It will help you to read small text when you forgot your glasses. • Unit Converter Elegant and powerful unit converter with 16 categories. It can convert most currencies in the world. The exchange rate is updated frequently. • Tip Calculator Offer quick and easy way to calculate tips and split the bill among friends. Cash rounding is included for convenient. • Fraction Calculator Helps you to solve fraction maths quickly and easily. For example feet and inch calculator. • Stopwatch Great for timing sport events and contest. It has a hybrid design that combine both mechanic and digital stopwatch. Accurate to 1/100 second. Records can be copied to the clipboard. • Spirit level Use this tool to measure angles of any object. You can use this tool for picture alignment and home decoration. • Surface level Measure the slope of any flat surface such as pool table and table tops. • Ruler Support both inches and centimeters. It contains sliders to help measure small objects. • Protractor Measure angles from 0 to 180 degrees. Support degree and radian mode. • Battery Info Displays remaining time for various type of tasks such as surfing the internet or playing games. • Features: - A mini compass is included with the flashlight - Flashlight brightness is adjustable (iOS6 and later) - Authentic looking mechanical stopwatch - Calibrate and lock buttons for levels - Ruler with sliders for precise measurement
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
@react-navigation/native
@react-native-async-storage/async-storage
expo-sharing
react-native-gesture-handler
BUILD KIT DIFFICULTY
Starter
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.
