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
Zakat 101
Zakat Calculator: Simple, Accurate, Reliable
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Zakat 101: map the core Finance 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
Provide educational resources or tooltips to guide users through calculations.
Assumption to check: Users may find Zakat calculations complex and confusing.
Validate with people who use this workflow before building.
Hypothesis 2
Add features like Zakat reminders, donation tracking, or community contributions.
Assumption to check: Limited functionality compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Design a more attractive and user-friendly interface.
Assumption to check: User interface may not be appealing or modern.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a guided onboarding process for first-time users.
Assumption to check: Initial learning curve for new 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
Zakat Calculator: Simple, Accurate, Reliable Calculate your Zakat with precision and ease using our comprehensive Zakat Calculator app. Designed for Muslims worldwide, this app provides a straightforward way to calculate your annual Zakat obligations across various asset types. FEATURES: • COMPREHENSIVE ASSET TRACKING Track all your Zakatable assets in one place including cash, gold, silver, business assets, investments, rental properties, and more. • REAL-TIME GOLD & SILVER RATES Access up-to-date gold and silver prices to ensure accurate Nisab threshold calculations. You can also manually edit rates if needed. • MULTIPLE CURRENCY SUPPORT Calculate Zakat in multiple currencies including USD, EUR, GBP, PKR, and more. • AUTOMATIC NISAB CALCULATION The app automatically calculates the current Nisab threshold based on gold and silver values. • DETAILED BREAKDOWN Get a clear breakdown of your Zakat calculation showing exactly how much is due on each asset type. • DARK MODE SUPPORT Enjoy a comfortable viewing experience in any lighting condition with our elegant dark mode. • SIMPLE CALCULATOR FUNCTIONALITY Easily add values with our built-in calculator that supports linear addition (e.g., "13.5+26"). • SAVE YOUR DATA Your asset values are saved locally on your device for convenience. • PRIVACY FOCUSED All your financial information stays on your device - we don't collect or store any of your personal data. Whether you're calculating Zakat for the first time or you're a seasoned user, our Zakat Calculator provides the tools you need to fulfill this important pillar of Islam with confidence and accuracy. Download now and simplify your Zakat calculations!
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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
React Navigation
Axios
React Query
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.
