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.
Most margin calculators stop at sale price and cost
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Profit Margin Analyser: 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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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
Assumption to check: Users often find it difficult to understand gross margin calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited functionality beyond basic calculations.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase confusion regarding features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of user customization options.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Most margin calculators stop at sale price and cost. This is too simplistic for Marketplace Sellers that take their online business seriously. Seller Profit Calculator goes further. It helps online sellers calculate real profit after the costs that actually affect every sale: marketplace fees, delivery charges, sales tax, product cost and margin. Use it before you list, re-list, accept an offer, or reprice an item so you know what you are likely to keep. Designed for independent sellers, resellers, makers and small product businesses, our app helps you model selling prices quickly without having to remember formulas or rebuild the same calculation every time. KEY FEATURES • Calculate real profit after selling fees • Include delivery charges, sales tax and product cost • Model marketplace and platform fees • Save inventory items for faster repricing • Remodel prices without re-entering everything • Compare different selling scenarios • Calculate margin, markup and net profit • Useful for eBay, Amazon, Etsy, Shopify and other selling platforms • Built for quick pricing decisions on iPhone WHY IT IS DIFFERENT Basic margin calculators are fine for simple sums. But selling online is rarely that simple. A profitable-looking item can become unprofitable once selling fees, delivery, tax and other costs are included. Seller Profit Calculator helps you see the real number before you commit to a price. SAVE INVENTORY. REPRICE FASTER. If you sell the same item more than once, you should not have to type the same product cost, delivery assumptions and fee details every time. Save inventory items in the app and remodel prices when costs, fees or selling platforms change. BUILT FOR SELLERS Use it when sourcing stock, preparing listings, checking marketplace fees, testing price changes or deciding whether an item is worth selling on a particular platform. Whether you sell through eBay, Amazon, Etsy, Shopify or another platform, Seller Profit Calculator helps you price with more confidence. IMPORTANT: Not affiliated with eBay, Amazon, Etsy or Shopify. Platform names are used only to describe configurable fee modelling in our app.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.