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
Inventory Calculator
Simplify complex financial and inventory calculations with our powerful Calculator App
$2.99 · In-app purchases
PRICE
$2.99
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/
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 Inventory Calculator: map the core Business 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 detailed analytics for inventory trends and stock alerts.
Assumption to check: Lack of advanced features like analytics and reporting
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize their dashboard and item displays.
Assumption to check: Limited user interface customization
Validate with people who use this workflow before building.
Hypothesis 3
Implement user accounts for team collaboration.
Assumption to check: No multi-user support
Validate with people who use this workflow before building.
Hypothesis 4
Offer tiered subscription plans for additional features.
Assumption to check: Static pricing model
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
Simplify complex financial and inventory calculations with our powerful Calculator App. Whether you’re a business owner, accountant, student, or financial professional, this app provides accurate results instantly with easy-to-use calculators designed for every key metric. Included Calculators: ================ Accounting Rate of Return (ARR) Calculator – measure investment profitability. Beginning Inventory Calculator – calculate starting inventory values. Cash Flow To Debt Holders Calculator – track payments to debt investors. Cost of Goods Available For Sale Calculator – compute goods cost ready for sale. Book Value per Common Share Calculator – find value per share for equity analysis. Residual Value Calculator – estimate salvage value of assets. Days in Inventory Calculator – analyze efficiency in selling inventory. Inventory Shrinkage Percentage Calculator – detect stock loss and discrepancies. Inventory Turnover Calculator – measure how often inventory is sold/replaced. Inventory Stock Turnover Ratio Calculator – monitor stock management performance. Total Inventory Cost Calculator – track complete costs of holding inventory. Operating Cash Flow Calculator – evaluate cash generated from operations. Ending Inventory Accounting Calculator – determine remaining stock value. Key Features: ========== - Fast and accurate calculations - Simple and user-friendly interface - Perfect for business, finance, and academic use - Saves time with pre-built financial formulas - All calculators in one place Whether you’re managing business finance, studying accounting, or optimizing inventory, this app is your go-to tool for smart financial decisions.
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
TypeScript
Zustand
react-navigation
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.
