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
Blood Pressure Assistant
Blood Pressure Assistant is an easy-to-use app that helps you to log, manage and remember all your blood pressure measurements
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
842 ratings · Top 15%
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 included19 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 Blood Pressure Assistant: 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
Implement more comprehensive visualizations of blood pressure data.
Assumption to check: Users report difficulty in tracking trends over time.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add detailed notes and tags to individual readings.
Assumption to check: Limited support for custom notes on readings.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and provide better onboarding guidance.
Assumption to check: Some users find navigation confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce additional free features to enhance value before subscription.
Assumption to check: Subscription model may deter some users.
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
Blood Pressure Assistant is an easy-to-use app that helps you to log, manage and remember all your blood pressure measurements. Monitor your blood pressure on long and short term and put your doctors’ into the picture. Thanks to Blood Pressure Assistant bureaucratic logging of blood pressure measurements is finally a thing of the past: Instead of maintaining large Excel spreadsheets or notepads, you can now take your blood pressure data always with you in your iPhone. Blood Pressure Assistant enables you to enter your blood pressure and recall it at any time. Through its modern and intuitive design, Blood Pressure Assistant is easy-to-use and provides a pleasant user experience. Beautiful, handcrafted charts offer you a quick overview of the latest developments of your hypertension. However, you still have the possibility for deeper analysis: Thanks to built-in export capabilities, you can send all your data via e-mail to anyone you like. All features at a glance: - intuitive and modern user interface - save blood pressure readings, heart rate, date and related notes - delete blood pressure readings - tabular listing of all blood pressure data - charts on a 5-day, weekly monthly and total base - export via e-mail (csv-format) - Apple Health Sync (iPhone only) Please note: Apple Health is currently only available for iPhone. Thus, synchronization of data between iPhone and iPad via Apple Health is currently not supported. By downloading this app you agree to our Terms of Service and Privacy Policy: www.caloon.co/legal
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-native-chart-kit
@react-navigation/native
Zustand
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.
