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
Too Short? BMI Calculator
Too Short! - The BMI Calculator That Makes Sense
$0.99 · In-app purchases
PRICE
$0.99
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 included14 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 Too Short? BMI Calculator: map the core Health & Fitness 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
Introduce community features or challenges to motivate users.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set personal goals or track changes over time.
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share their BMI results on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with HealthKit or Google Fit to pull user data for better insights.
Assumption to check: No integration with health data
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
Too Short! - The BMI Calculator That Makes Sense Ever wondered what your BMI really means? Too Short! takes a fresh approach to body mass index by asking a simple question: Are you too short for your weight, or too tall? See Your BMI Come to Life Watch as a color-coded human figure adjusts in real-time based on your measurements. A reference ruler shows you exactly how your height compares to the "ideal" height for your current weight. It's BMI visualization that finally makes sense. Smart & Simple —Beautiful, intuitive sliders for height and weight —Instant visual feedback with color-coded categories —Clear explanations - no medical jargon —Choose your preferred units: feet/inches, centimeters, pounds, kilograms, or stone Designed for Every Device Seamlessly optimized for iPhone, iPad, and Mac. The interface adapts beautifully whether you're using portrait or landscape orientation. Your Privacy Matters No accounts, no cloud sync, no tracking. Your measurements stay on your device, period. Understanding BMI Categories From underweight to overweight, Too Short! displays the full spectrum of BMI ranges with easy-to-understand color coding and helpful guidance about where you fall. Note: This app is for informational purposes only and is not a substitute for professional medical advice. Always consult with a healthcare provider for medical concerns.
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
React Navigation
Zustand
@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.
