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
PayRange
Pay with a simple swipe on your phone screen.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
221,169 ratings · Top 15%
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 included18 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 PayRange: map the core Utilities 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
Offer more payment integrations like PayPal or Apple Pay.
Assumption to check: Limited payment method options
Validate with people who use this workflow before building.
Hypothesis 2
Implement robust error handling and feedback mechanisms.
Assumption to check: Occasional bugs with QR scanning
Validate with people who use this workflow before building.
Hypothesis 3
Provide customizable notification settings for users.
Assumption to check: Lack of customization for transaction notifications
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI to enhance user experience and make key actions more accessible.
Assumption to check: Cluttered interface with too much information
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
Pay with a simple swipe on your phone screen. Use PayRange to pay at thousands of vending, laundry, arcade, parking, coffee and other supported machines with a simple swipe of your finger. - Swipe left or right on the phone app screen to select the machine. - Swipe up on your phone screen and payment will be sent to the machine. It is that SIMPLE. QUICK AND SIMPLE: NO MORE COINS, NO MORE BILLS. PayRange takes the hassle out of your life. To guarantee the highest level of convenience, we designed our app for a quick and secure payment experience. Your experience is as simple as swiping your finger on your phone screen. You do not need to worry about having the right amount of change, small bills, or bill acceptor issues. SAFE AND SECURE: Safety and security of your payment information is our first priority. We accept a range of payment options including all major credit cards and Apple Pay. We use a secure PCI compliant processor to guarantee that your PayRange payments are protected. At any time, we do not send any personal information to the machine. EVERYWHERE AND GROWING: Look for the PayRange icon on the machine to determine if it accepts PayRange payments. As soon as you enter the range of a PayRange supported machine, the app will automatically detect the enabled machines. No pairing or configuration is required. All you need to do is swipe on your phone screen to select the machine you want to pay at. PayRange is enabled on machines in a broad range of industries such as vending, laundry, amusement, coffee etc. Get the app today! Simplify your payment experience with PayRange. ------------------------------------------ *** NOTE: The machine must be PayRange enabled *** This app will not work if the machine is not equipped with PayRange hardware. ------------------------------------------- Visit http://payrange.com for a video demonstration. If you’d like your machine at work or school to be PayRange enabled, have the operator of your machines contact us at [email protected]
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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.
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BUILD KIT DIFFICULTY
Expert
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.
