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
Length Converter Inch to Cm
Are you in need of a lightning-fast and exceptionally user-friendly tool to convert length units? Look no further! Our Length Converter app is your go-to solution for effortless unit conversions
$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/
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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 Length Converter Inch to Cm: map the core Productivity 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
Expand to include other units like feet, meters, etc.
Assumption to check: Limited conversion options (only inches to cm)
Validate with people who use this workflow before building.
Hypothesis 2
Implement a feature to save conversion history.
Assumption to check: No historical data for conversions
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize the app's theme and settings.
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the design with animations and a more modern interface.
Assumption to check: Lack of engaging UI/UX
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
Are you in need of a lightning-fast and exceptionally user-friendly tool to convert length units? Look no further! Our Length Converter app is your go-to solution for effortless unit conversions. Whether you need to convert meters to kilometers, inches to feet, or any other length unit, our app has got you covered. Here's why our one-by-one length converter shines: Instant Unit Conversion: Say goodbye to tedious calculations! Our app instantly transforms your input into the desired unit, whether you're switching from meters to kilometers, inches to feet, or any other length unit. Intuitive and Elegant Interface: We believe in keeping things simple and visually appealing. Our app boasts a clean and intuitive design, ensuring a seamless and delightful user experience. Compact Installation Size: Worried about consuming too much storage space on your device? Fret not! Our app is compact in size, guaranteeing it won't weigh down your device. No Internet Connection Required: Stay connected or go offline – our app functions flawlessly without an internet connection, offering reliability wherever and whenever you need it. Effortless Conversion Process: Using our app is as easy as 1-2-3. Simply select the unit you want to convert from, enter your number, and witness an instant conversion to the unit of your choice. Comprehensive Unit Selection: Our app covers a wide range of length units, including meters, kilometers, inches, feet, miles, nautical miles, yards, centimeters, and millimeters. Don't waste your valuable time on manual conversions or complex calculations. Download our Length Converter app today and revel in the simplicity of effortless unit conversions. Say hello to convenience and wave goodbye to the hassles of unit conversion!
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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
TypeScript
React Navigation
@react-native-async-storage/async-storage
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.
