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
Mila's Unit Converter PRO
Transform everyday calculations with Mila's Tools, the ultimate all-in-one unit converter designed for precision, speed, and simplicity
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
842 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's included16 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 Mila's Unit Converter PRO: 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 categories and add more niche units.
Assumption to check: Limited unit options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Create a cohesive design system with consistent components.
Assumption to check: Inconsistent UI design across different screens
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create custom conversion types.
Assumption to check: No ability to customize conversions for user preferences
Validate with people who use this workflow before building.
Hypothesis 4
Implement a free trial period to attract more users.
Assumption to check: No free version to try before purchase
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
Transform everyday calculations with Mila's Tools, the ultimate all-in-one unit converter designed for precision, speed, and simplicity. Whether you're a student, engineer, chef, or traveler, effortlessly convert between hundreds of units across 22 essential categories. Say goodbye to complex formulas—get accurate results in seconds! ------------------------------------- What customers are saying: ***** "Get it! Nothing better than this!" ***** "This is the best quick ref tool I have come across to date" ***** "Undoubtedly the best conversion app in the App Store." ***** "Best app for me so far." ***** "Intuitive interface. The app design is so easy you'll actually use it." ------------------------------------- KEY FEATURES: * Comprehensive Categories: Convert area, bits & bytes, blood sugar, capacitance, dates, density, energy, flow rate, force, fractions, fuel, illuminance, length, numbers, power, pressure, temperature, time, torque, velocity, volume, and weight. * Vast Unit Library: Supports metric, imperial, US customary, astronomical, nautical, and specialized units like barns, barns, light years, parsecs, and more. * Smart Conversions: Special tools for temperature (Celsius to Fahrenheit), fuel (mpg to L/100km), fractions (to decimals/percent), blood sugar (mg/dL to mmol/L with range slider), and grouped views for length, weight, volume, area, pressure, and torque. * Customizable Experience: Toggle visible categories and units, adjust decimal precision (auto or up to 10 digits), choose number formats (US, European, Swiss, French, Indian), and enable dark mode. * Intuitive Search: Quickly find categories and units with built-in search. * No Internet Needed: All conversions happen offline for reliable use anywhere. * Made in America! Download Mila's Tools today and simplify your conversions—built with love to make life easier. Questions? Send feedback via the app! ------------------------------------- * 200+ CONVERSIONS * Includes everything from Area to Weight. * FASTEST CONVERTER AVAILABLE * No need to "submit" values. Conversions happen as you type. * NO DIALS * Nothing to dial in, Just select the unit category and go. * ACTIVE FILTERING * Find what you're looking for quickly. * AUTO CONVERTS MULTIPLE UNITS AS YOU TYPE * All associated units auto-convert as you enter any value. * FULLY CUSTOMIZABLE * Hide everything you don't need and show only what you need. -------------------------------------
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.
