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
Unit Converter ∞
Forget what you know about common Unit Converters
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
243 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's included16 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 Unit Converter ∞: 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
Expand unit types and categories for greater usability.
Assumption to check: Limited unit types compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline mode for better accessibility.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Streamline unit selection with better categorization.
Assumption to check: Cluttered UI when selecting units
Validate with people who use this workflow before building.
Hypothesis 4
Add animations or sounds to confirm conversions.
Assumption to check: Lack of user feedback on conversions
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
Forget what you know about common Unit Converters. Undoubtedly, Converter ∞ (Infinity) offers unique features & greatly new user experience!!! ◉ Featured: Converter ∞ greatly supports huge Database with 50 available categories and over 1000 units (Include mixed unit such as ft + in, m + cm,...) so Converter ∞ can help you solve almost every conversion problem in your Work, your Study and also your daily life. You can, moreover, add your regular conversion to Favorite Section so that your conversion task would be as fastest as ever! ◉ Perfect Design: Converter ∞ has a shape of arc combined with sci-fi style offering convenient & interesting user experience. ◉ Ultimate Converter: More than a normal Unit Converter, Converter ∞ can help create your self–made conversion units to the converter. It makes your converter become Unlimited !!! ◉ Official Website: Http://iPhoneCalculator.com ◉ Features: ▸ Support Widget ▸ Universal Converter App ▸ 50+ Categories &1000+ Units ▸ Currency(Money) Exchange ¹ ▸ Price Conversion ▸ Luminous Conversion ▸ Retina Display Support ² ▸ Global Favorite Section ▸ Category Favorite Section ▸ Create your own unit ▸ Turn On/Off Units ▸ Turn On/Off Categories ▸ Mixed-unit Support ▸ Fraction(Mixed) Support ▸ Scientific Calculator ▸ Support Widget ▸ Online DB Update ▸ Online Update Currency Rate ³ ▸ Online Tutorial & Documents. ◉ Featured Conversion: ▸ Mixed Unit Conversion: Met - Ft + In. ▸ Fuel Consumption: Km / Lit - Mil / Gal. ▸ Price Conversion: USD / Gal - EUR / Lit. ▸ Luminous Conversion Tool: Convert Among Luminous Flux, Intensity and Apex Angle. ▸ Electrical Conversion Tool: Convert Among Electric Current (A), Power (W), Voltages (V). ¹: Source: Yahoo! Finance (85 Currencies) ²: All iPhone (Incl. 7/7+) / iPad Retina Display ³: Manual & Hourly Auto Update. New Data Base Update available weekly. No Ads & High Performance. ◉ Categories: Length, Area, Volume, Mass, Acceleration Linear, Acceleration Angular, Angle, Calorific Value, Data, Capacitance,Conductance,Conductive, Currency, Data Transfer, Density Common, Electric Field, Energy, Entropy, Force, Fuel Consumption, Heat Capacity, Heat Flux Density, Illumination, Inductance, Linear Charge Density, Luminance, Linear Current Density, Magnetic Flux Density, Moment Inertia, Power, Pressure, Radioactivity, Radiation Absorb Dose (Rate), Resistance, Price, Resistivity, Speed, Surface Tension, Torque, Time, Thermal Conductivity / Resistivity, Thermal Expansion, Typography, Temperature Velocity Angular, Viscosity Dynamic / Kinematic, Volume Flow Rate, Volume Dry.
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.
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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.
