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
Checkin Checkout
A checkin and checkout system with scannable ID card creation
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 ratings · Below Average
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 Checkin Checkout: 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
Focus on robust features and thorough testing before launch.
Assumption to check: Poor user reviews indicating a lack of functionality and bugs
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clean, user-friendly design with clear navigation paths.
Assumption to check: Cluttered interface and difficult navigation
Validate with people who use this workflow before building.
Hypothesis 3
Enhance event creation and management tools to include reminders and attendee tracking.
Assumption to check: Limited event management features
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance for various iOS devices to ensure smooth operation.
Assumption to check: Inconsistent performance across devices
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
A checkin and checkout system with scannable ID card creation. It can be used by schools, church, movie theater, company to check in/out people. It is simple and easy to use. This app is for any institution who needs to checkin and checkout people by simply scanning the check in/out QRCode card or Wallet Pass created by this app. I. ID card Creation - create check in/out Scannable ID (QR code barcode ID) - create card with your own background - create card with default background (more will be added) - create Scannable Keychain ID card. - Create and Print ID card directly from iOS devices. - Create scannable ID card suitable for any commercial company, school, or anyone. - Create card with Photo directly taken from camera - Bulk upload cards with CSV file II. ID Card Printing - Print ID card directly from iOS devices - Show a list of ID for Reprint - Print two cards at one time with two sides - Print cards with different layout such as regular ID card, keychain card. - Send ID card to email for any 3rd party professional ID printing service. III. Use for check-in and check-out - People can come and scan the card at the back of the scannable ID card. You can click "Done" to check in/out. You may also set up in the setting so that it can take the person's signature as well. - All check-in, check-out time is saved in database which can be used to generate any report by date. IV. Report - Generate report for today - Generate report by Date - Generate report with signature (PDF) - Send all reports to Excel format (.csv) V. User Case - Student Check in and Check out - Church Check in and out - Company worker Check in and out - Keep track attendance for any special event Requirement: Internet is required for any barcode creation. Therefore, if you don't have internet, you may create ID card without scannable barcode. The user ID and name is sent to our server to generate the QR code. We choose QR code because QR code can provide more information than any regular barcode. You don't need internet for Checkin and Checkout action.
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 Native
Expo
Axios
Zustand
React Navigation
Firebase
BUILD KIT DIFFICULTY
Starter
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.
