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
WHATSIZE: Brand Size Converter
Stop guessing your size
$2.99 · In-app purchases
PRICE
$2.99
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 WHATSIZE: Brand Size Converter: map the core Shopping 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
Provide visual guides or tutorials for measurement.
Assumption to check: Users find it hard to input accurate measurements.
Validate with people who use this workflow before building.
Hypothesis 2
Include a wider range of clothing sizes.
Assumption to check: Limited size options may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate user reviews and ratings.
Assumption to check: Lack of user feedback on calculated sizes.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and add tooltips.
Assumption to check: Navigation can be confusing for new users.
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 guessing your size. Get it right, every time. WHATSIZE is the essential size converter for global shoppers. Convert clothing and shoe sizes instantly - whether you need a specific brand recommendation or a standard international conversion. EXAMPLES: • Know your Nike size? Find your size in ZARA in seconds. • Wear a UK 12? See what that is in US, EU, Japanese, Korean, and Chinese sizing. • Own Levi's W32 L34? Find your fit in Gap or H&M without trying anything on. • Shopping on ASOS from Germany? Convert EU sizes to UK instantly. TWO WAYS TO FIND YOUR FIT: • Brand-to-Brand: Use items you already own from top brands to find your perfect fit in another. • Universal Conversion: Instantly convert standard sizes between US, UK, EU, and Asian (JP/KR/CN) regions. SUPPORTED CATEGORIES: • Tops, bottoms, dresses, outerwear, and shoes • Men's, women's, and kids' • US, UK, EU, JP, KR, CN regions KEY FEATURES: • Your Personal Digital Closet: Save your sizes (and your family's!) for instant access while shopping. • 100% Offline: Works perfectly in dressing rooms and during international travel. • Privacy First: No accounts. No tracking. No ads. Your data never leaves your device. • Pay Once, Use Forever: No subscriptions. Every future update and brand addition is included. SUPPORTED BRANDS: Nike, ZARA, Adidas, H&M, Levi's, Gap, Uniqlo, and ASOS - with more added regularly based on user requests. Missing a brand? Request it directly in the app. https://whatsize.online
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
Axios
React Navigation
React Native Paper
Firebase
BUILD KIT DIFFICULTY
Intermediate
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.
