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
Auction Calc (for Ebay Paypal Profit Projections)
Easy and Accurate pricing Utility!
$1.99
PRICE
$1.99
No 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 included16 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 Auction Calc (for Ebay Paypal Profit Projections): 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
Implement numeric keypads and sliders for easier input
Assumption to check: Users may find it hard to input precise values quickly
Validate with people who use this workflow before building.
Hypothesis 2
Add features for bulk calculations or historical comparisons
Assumption to check: Limited functionality for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to export calculation history to CSV or email
Assumption to check: No data export options
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate charts or graphs to visualize profitability trends
Assumption to check: No visual representation of profits
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
Easy and Accurate pricing Utility! See instantly with big graphs if you will be profitable! This is a Profit / Loss / Projections calculator tool for use as an Ebay auction tool. It will help you set an appropriate price for your ebay items and show how much you will make after ebay and paypal take their share. For example: This application can be used to find what is the best profit that can be made when listing an item as a Fixed Price Only or a regular Auction. Also, shows how much can be made if the buyer pays with paypal or not. Use the item cost option to find the best selling price for your investment! -This app has sound / audio feedback -See the "How To" video app url on the left. -Takes advantage of screen on iphone 5 and ipod 5 -NO ads!
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 Navigation
Zustand
React Native Paper
Expo
React Native Slider
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.
