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
Mobile Passport Control
Mobile Passport Control (MPC) is an official application created by U.S
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.9
635,568 ratings · Top 5%
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 included17 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 Mobile Passport Control: map the core Travel 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 a more efficient data submission process.
Assumption to check: Users may experience slow response times when submitting data
Validate with people who use this workflow before building.
Hypothesis 2
Include multilingual support to cater to diverse travelers.
Assumption to check: Limited support for multiple languages
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI and improve onboarding guidance.
Assumption to check: Some users find the user interface difficult to navigate
Validate with people who use this workflow before building.
Hypothesis 4
Enhance security measures and provide transparent data policies.
Assumption to check: Privacy concerns regarding data storage
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
Mobile Passport Control (MPC) is an official application created by U.S. Customs and Border Protection that streamlines your CBP inspection process at select U.S. entry locations. Simply complete your travel information, answer CBP inspection questions, capture a photo of yourself and of each member of your group, and follow the instructions provided on your receipt. Important Notes: • MPC does not replace your passport; your passport will still be required for travel. • MPC is only available at supported CBP entry locations. • MPC is a voluntary program which can be used by U.S. Citizens, certain Canadian Citizen Visitors, Lawful Permanent Residents, and returning Visa Waiver Program applicants with an approved ESTA. More information regarding eligibility and supported CBP entry locations can be found on our website: https://www.cbp.gov/travel/us-citizens/mobile-passport-control MPC can be used in 6 simple steps: 1. Create a primary profile to save your travel documents and biographic information. You can add and save additional eligible people to the MPC app so that you can submit together from one device. Your information will be securely stored on your device to be used for future travel. 2. Select your CBP port of entry, terminal (if applicable), and add up to 11 additional members of your group to include in your submission. 3. Answer CBP inspection questions and certify the truthfulness and accuracy of your answers. 4. Upon arriving at your selected port of entry, tap the “Yes, Submit Now” button. You will be asked to capture a clear and unobstructed photo of yourself and of each other person that you included in your submission. 5. Once your submission is processed, CBP will send a virtual receipt back to your device. Follow the instructions on your receipt and be prepared to present your passport and other relevant travel documents. 6. The CBP Officer will complete the inspection. If further information is required, the CBP Officer will let you know. Please note: The CBP Officer may ask to capture an additional photo of you or your group members for verification.
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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.
