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
RapidASCVD: ASCVD Risk Calc
RapidASCVD accurately estimates 10-year ASCVD (atherosclerotic cardiovascular disease)
$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 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 RapidASCVD: ASCVD Risk Calc: 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
Provide clear tooltips and examples for each input.
Assumption to check: Users often find medical calculators confusing to use.
Validate with people who use this workflow before building.
Hypothesis 2
Include graphs or charts to represent risk over time.
Assumption to check: Limited data visualization of results.
Validate with people who use this workflow before building.
Hypothesis 3
Integrate tailored health tips based on results.
Assumption to check: Need for more personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 4
Create a transparent explanation of premium features and benefits.
Assumption to check: In-app purchases can be 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
RapidASCVD accurately estimates 10-year ASCVD (atherosclerotic cardiovascular disease). The user interface has been optimized for speed so that busy clinicians are able to quickly calculate ASCVD scores for patients in the fastest amount of time possible -- usually within about 10-15 seconds. ASCVD risk is the estimated probability of a patient having a first-time (primary) event of coronary heart disease (such as myocardial infarction), cerebrovascular disease (such as stroke), and peripheral arterial disease. This estimate is not appropriate for use in patients who have already had one of these cardiovascular events. RapidASCVD has been extensively tested for accuracy with the pooled cohort equations (2013 ACC/AHA Guideline on the Assessment of Cardiovascular Risk. doi: 10.1161/01.cir.0000437741.48606.98), which is derived from the following variables: • Age • Total cholesterol • HDL cholesterol • Systolic blood pressure • Sex • Race • Presence of antihypertensive therapy • History of diabetes mellitus • Current smoking status The risk estimate is consistent with the 2019 ACC/AHA Guideline on the Primary Prevention of Cardiovascular Disease (doi: 10.1161/CIR.0000000000000678), acknowledging that many other cardiovascular risk factors exist that are not present in the ASCVD risk calculation. This clinical tool is intended to be used in conjunction with reasonable clinical 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
React Native
Expo
TypeScript
React Navigation
Axios
AsyncStorage
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.
