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
The Cardiac Calculator
Cardiac Calculator delivers fast, accurate and clinically focused tools designed to streamline everyday ECG and pacing calculations
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 The Cardiac 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
Include more calculators and resources for different cardiac conditions.
Assumption to check: Limited functionality for diverse cardiac metrics
Validate with people who use this workflow before building.
Hypothesis 2
Focus on a clean design and better navigation.
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 3
Implement features like reminders for regular check-ups.
Assumption to check: Lack of user engagement tools (e.g., reminders)
Validate with people who use this workflow before building.
Hypothesis 4
Add a feedback feature for continuous improvement.
Assumption to check: No feedback mechanism for users to report issues
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
Cardiac Calculator delivers fast, accurate and clinically focused tools designed to streamline everyday ECG and pacing calculations. Whether you’re working in the cath lab, pacemaker clinic or assessing patients on the wards, the app brings clear, reliable cardiac measurements straight to your fingertips. This update introduces a powerful new pacing section with dedicated tools for TARP calculation, 2:1 block rate estimation and a streamlined PMT helper to support rapid pacing decisions. A brand-new Pulse Checker has also been added, offering a simple way to assess pulse rate and rhythm when an ECG machine isn’t available. The app now features improved number entry, smoother navigation and general interface refinements for a cleaner, faster experience throughout. Core features: • ms to BPM converter • BPM to ms converter • Small squares to ms calculator • Cardiac axis assistant • Height and weight converter • BMI calculator • CHA₂DS₂-VASc calculator • HAS-BLED calculator Pacing tools: • TARP calculator • 2:1 block rate calculator • PMT helper • Pulse Checker for quick rate and rhythm assessment Designed with cardiac professionals in mind, Cardiac Calculator helps you make accurate, on-the-go clinical calculations with confidence and clarity.
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
Axios
Zustand
React Navigation
React Native Paper
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.
