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
shiftscreen 4X
Use a monitor with your iPad or iPhone as a second screen!
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
158 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 included18 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 shiftscreen 4X: map the core Productivity 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
Include more customization options for app layouts and interactions.
Assumption to check: Limited app management features compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Focus on user-friendly design and extensive testing.
Assumption to check: Poor user interface and low rating due to usability issues.
Validate with people who use this workflow before building.
Hypothesis 3
Implement cloud sync for better data management.
Assumption to check: Lack of cloud sync options and data backup.
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free trial and clear value proposition for users.
Assumption to check: High price point without clear value.
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
Use a monitor with your iPad or iPhone as a second screen! Work with your iPad and place things on your monitor. Connect your external monitor via cable or AirPlay and start using your monitor in fullscreen. **Please make sure that you can connect your device to a monitor using a cable or AirPlay.** No more black bars around your monitor, shiftscreen brings you fullscreen external display support. Work with the integrated web-browser, the PDF-viewer, the integrated webapps or the calculator app. Boost your productivity by working with your monitor as a second screen while doing other things on your iPad in split-view. Or use your iPhone as a full computer and as a trackpad for the monitor. What’s new in 4X? - full mouse and trackpad support - 60 fps support on your monitor - windows and tabs in the web-browser - over 50 customizable keyboard shortcuts - 2x the resolution on the monitor - rotate your monitor and configure it however you want - change the colors and feel of the app - zoom-in-mode: view a specific part of your monitor on your iPad or iPhone shiftscreen will improve your productivity and completely change the way you use you monitor.
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
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Expo
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react-native-gesture-handler
react-native-reanimated
BUILD KIT DIFFICULTY
Advanced
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.
