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.
With Unit Price Calculator you can easily choose the most economical package size
$3.99 · In-app purchases
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 Unit Price Comparison: 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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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 struggle with organizing and comparing multiple products effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited product database leads to redundancy in manual entry.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Users find it hard to visualize price comparisons over time.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase confusion can lead to frustration.
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.
With Unit Price Calculator you can easily choose the most economical package size. Calculator calculates unit price, shows the better offer and how much you can save. Need to know the product price per unit, weight, volume, length or area? Not sure you are getting the best deal? For example, is it better to buy eight 5-oz items for $9.50 or twelve 4-oz items for $12.50? With unit price calculator you can easily calculate the unit price. The unit price calculator lets you compare unit prices for similar products measured by weight, volume and products sold by the item: - price per unit (piece, package, etc) - price per weight (price per oz, lb, kg, 100 g, gram) - price per volume (price per fl oz (US), gal (US), fl oz imp, gal imp, ml, cl, dl, liter) - price per length (price per in(′), ft(″), yd, mm, cm, dm, meter) - price per area (price per sq in, sq ft, sq yd, sq, mm², cm², dm², m²) Simply enter the prices, quantities and sizes for comparable products and tap Calculate. To calculate the price with the Sales Tax, just set it in the Settings window. Unit Price Calculator shows you the better deal and your savings. With Unit Price Calculator you can even calculate how much you can save per month or per year choosing the more economical package size. For example, if you know your average consumption of sugar, water, apples, meat, milk, etc per week, month or year, just enter it in the "Calculate price for" and the app shows you how much you can save. You can enter any amount of units, ounces, pounds, liters, gallons, etc. you want to calculate the price for. For example, you can select to calculate the price per 1 fl oz, 5 lbs, 10 gal, 100 kg, 3 cl, etc. If you leave the field empty, the price will be calculated per one unit of measurement. You can compare products in US, imperial and metric unit measurement systems. Unit price calculator allows you to compare sale prices with or without discounts. You can enter discount percentage or discount amount. Note: to enter discounts, you need to rotate your device to landscape orientation. The app supports rounding to the specified number of decimal places from 0 to 3. By default, the app displays 2 decimal places. To round results to the nearest whole number, select 0 decimal places. Unit Price Calculator makes calculations in one of 21 supported currencies. Unit Price Calculator keeps calculation history so you can easily view and compare your recent calculations. You can easily share your results via email. The calculator supports both portrait and landscape orientation.
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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.