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
ECG Reader
This application compares the electrocardiograms (ECGs) displayed on the camera to their own ECG database and makes instantly ECG interpretation
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.2
75 ratings · Below Average
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 ECG Reader: 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
Focus on improving user interface and performance.
Assumption to check: Poor user reviews and low rating.
Validate with people who use this workflow before building.
Hypothesis 2
Include more analytical features or insights.
Assumption to check: Limited functionality for ECG analysis.
Validate with people who use this workflow before building.
Hypothesis 3
Clarify benefits of premium features and ensure smooth payment flow.
Assumption to check: In-app purchase issues and unclear value.
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the upload process and provide clear instructions.
Assumption to check: Difficulties in file uploads.
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
This application compares the electrocardiograms (ECGs) displayed on the camera to their own ECG database and makes instantly ECG interpretation. Most probable the first 5 findings, together with the similarity percentage of compliance shows on the phone screen. In the application, clinically significant and frequent ECG findings were concentrate on. The application has been developed in order to assist non-specialist health personnel in ECG interpretation. Comments made by the application do not report the exact results and may contain important mistakes. For this reason, it is recommended to consult a cardiologist in case of significant clinical suspicion. This application uses augmented reality. Therefore your phone need to have adequate configuration to work smoothly. For best results, the entire ECG should be visible on the phone display. The application should not be used for strip ECGs.
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
Supabase
React Navigation
Zustand
@supabase/supabase-js
BUILD KIT DIFFICULTY
Expert
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.
