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
Drip Infusion - IV Rate Calc
This app calculate the drip rate by setting the required time and volume of infusion.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.4
8 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 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 Drip Infusion - IV Rate 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
Add features for complex calculations and scenarios.
Assumption to check: Limited functionality for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Focus on stability and bug fixing in the clone.
Assumption to check: Poor user reviews citing bugs and crashes
Validate with people who use this workflow before building.
Hypothesis 3
Implement user settings for personalized experiences.
Assumption to check: Lack of user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to export their calculation history as a CSV or PDF.
Assumption to check: No export options for history
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 app calculate the drip rate by setting the required time and volume of infusion. The blue progress bar and flashing images, display the dropping interval. Timer and alarm will help the management of each drip intravenous injection. Drip rate calculation - There is a 20 gtt/mL and 60 gtt/mL infusion set of initial display. - If you need other infusion set, you can add any set. (1-99 gtt/mL) - Calculate "Rate" by setting "Volume" and "Time". - Calculate "Time" by setting "Rate" and "Volume". - Calculate "Volume" by setting "Time" and "Rate". - Flashing Image will be able to tap. Timer - The List display the remaining infusion time. Sick list - Name, room, memo, can be registered. - Name can be used as a display of the timer. Apple Watch support - Display the drip rate by setting the Infusion set(20/60/15/10), required time and volume of infusion. - Dropping rate is displayed by circle, time to round will be dropped interval. - Support Watch Complications [Attention] This app supports iOS9 or more. The vibes function applies to only iPhone. There is not vibes function in iPod and iPad. [Immunity from responsibility matter] This application is not a thing taking responsibility in the medical care. Please use it with the responsibility of the user.
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
Zustand
React Navigation
@react-native-async-storage/async-storage
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.
