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
OrthoBMI – BMI Calculator
OrthoBMI is a clinical BMI calculator designed for orthopedic surgery and joint replacement planning.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
6 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 OrthoBMI – BMI Calculator: map the core Medical 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
Incorporate social sharing features to track progress with friends.
Assumption to check: Limited user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Add gamification elements to encourage regular usage.
Assumption to check: No motivational elements
Validate with people who use this workflow before building.
Hypothesis 3
Implement charts for better tracking of BMI over time.
Assumption to check: Basic data visualization
Validate with people who use this workflow before building.
Hypothesis 4
Create a more user-friendly subscription management interface.
Assumption to check: Subscription management is unclear
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
OrthoBMI is a clinical BMI calculator designed for orthopedic surgery and joint replacement planning. Calculate patient weight at key BMI thresholds or determine BMI from actual weight using a fast, clinic-ready interface. Enter height to generate: • Target weight for BMI thresholds • Actual weight for BMI calculation Target weight represents the body weight a patient would need to reach a specific BMI threshold at their current height. It is presented as a practical estimate that accounts for normal day-to-day weight fluctuations, supporting realistic goal setting and preoperative planning. Features: • BMI calculator for orthopedic and surgical use • Toggle between target weight and actual weight calculations • Automatic outputs at BMI 35, 40, 45, and 50 • Optimized for iPhone and iPad • Integrated BMI guidance for surgery OrthoBMI supports efficient, consistent BMI-based discussions in clinic. This BMI calculator is intended for clinical support and informational use only and does not replace medical judgment.
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
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react-native-paper
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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.
