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
myConvert – Currency & Units
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$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
60 ratings · Top 5%
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 myConvert – Currency & Units: map the core Travel 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 real-time updates using a reliable API.
Assumption to check: Limited currency updates can lead to outdated rates.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify UI by categorizing units and currencies.
Assumption to check: User interface can be cluttered with too many options.
Validate with people who use this workflow before building.
Hypothesis 3
Add multi-unit conversion capabilities.
Assumption to check: Inadequate support for complex conversions (e.g., multiple units at once).
Validate with people who use this workflow before building.
Hypothesis 4
Enhance favorites with tagging and sorting features.
Assumption to check: Lack of a comprehensive favorites management system.
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
Stop scrolling. Start converting. Fast, flexible, and built for real use, all your conversions on one screen. *Features* - 1000+ units across 70+ types - See multiple results at once - Built-in calculator keyboard - Handle complex conversions with ease. 180cm convert to (and from) 5ft 10.87in. 60kg to 9st 6lb 4.44oz - Text search naturally and get instant results. “190cm to ft” => "6.2 foot", "6ft 2.8in" - Currency rates updated once a day or on demand - Searchable units and categories from home screen - Create custom units and categories - Simple, highly customizable, fast and responsive - Remembers your setup, just open and convert Built for speed. Designed to stay out of your way. Not convinced? Try the lite version with a smaller selection of units for free. Look for 'myConvert lite'. For full list of units, see product web page -> units. http://myconvertapp.com/units/ List of categories: Mass, Distance, Area, Temperature, Volume, Density, Volumetric Flow, Fuel consumption, Pressure, Time, Frequency, Timecode/Frames, Video length/space, Speed, Acceleration, Energy, Power, Force, Torque, Angle / Trigonometry, Navigation, Angular velocity, Resistance, Radioactivity, Carbon 14 Dating, Data storage, Data download, Numeral System, Luminance, Illuminance, SI prefixes, Currency, Suit/coat/sweater, Dress/suit, Shirts, Blouse/sweater, Shoes (Men), Shoes (Women), Socks, Stockings (Women), Dress (Juniors), Bra - band, Bra - cup, Hats, Rings, Electric current, Electromagnetic spectrum, Radiation absorbed, Moment of Inertia, Viscosity (dynamic), Viscosity (kinematic), Metal Hardness, Circular, Typography, Concentration (solution), Concentration (molar), Radiation, Radiation exposure, Musical Intervals, Musical notes, Sound level, Angular acceleration, Paper Weights, Resistivity, American wire gauge.
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
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axios
@react-navigation/native
react-native-picker-select
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.
