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
Instant ECG - Mastery of EKG
Instant ECG was designed as an ECG / EKG / Electrocardiogram guide for physicians, nurses, paramedics and other health care professionals
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
523 ratings · Top 30%
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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 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 Instant ECG - Mastery of EKG: 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 more interactive elements such as gamification and instant feedback.
Assumption to check: Limited interactivity in quizzes
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation with clearer labels and user-friendly transitions.
Assumption to check: Navigation can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Implement personalized recommendations based on user progress and preferences.
Assumption to check: Lack of personalized content
Validate with people who use this workflow before building.
Hypothesis 4
Clearly communicate subscription benefits and offer a free trial.
Assumption to check: Subscription model may 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
Instant ECG was designed as an ECG / EKG / Electrocardiogram guide for physicians, nurses, paramedics and other health care professionals. It is an excellent learning tool as well as a quick reference. ECGs: - Normal Sinus Rhythm (NSR) - Sinus Tachycardia - Sinus Bradycardia - Sinus Pause - Atrial Flutter - Atrial Fibrillation - Wandering Atrial Pacemaker - Premature Atrial Contraction - Supraventricular Tachycardia (SVT) - 1st Degree AV Block - 2nd Degree Wenckebach - 2nd Degree Mobitz II - 3rd Degree AV Block - Wolff-Parkinson White (WPW) - Junction Rhythm - Right Bundle Branch Block - Left Bundle Branch Block - Premature Ventricular Contraction (PVC) - Ventricular Escape - Ventricular Tachycardia - Torsades-de-Pointes - Ventricular Flutter - Ventricular Fibrillation - Idioventricular - Asystole - SVT Cardioversion to NSR - Torsades Cardioversion to A. Fib - V. Tach Cardioversion to ST Elevation - V. Fib Cardioversion to Asystole - V. Tach Cardioversion to Junctional - Right Ventricular Strain - Left Ventricular Strain - ST Depression Sinus Rhythm - ST Elevation Sinus Rhythm - Anteroseptal Wall MI - Anterolateral Wall MI - Lateral Wall MI - Inferior Wall MI - Apical Wall MI - Posterior Wall MI Exams: - ECG Basics - True or False - Multiple Choice - Identify the Rhythm Strip - Identify the 12-Lead Basic - Clinical Aspects of AV Blocks - Clinical Aspects of Bundle Branch Blocks - Clinical Aspects of MI - ACLS Bundle Exam Instant ECG was developed by iAnesthesia LLC and authored by T. Michael Truxillo M.D. CPPS and William S. Trask IV D.O. Instant ECG - REVIEWS - "Instant ECG is the best ECG guide available for the iPhone" - "The definitive FIVE STAR EKG App." - "Excellent App for student, resident or attending. I highly recommend it." - "Helps to keep the rhythms fresh in my mind. Good for a 5-min review. Great quiz functionality."
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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
React Query
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.
