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
Black - Live Wallpapers
Limited Time Offer : From $2.99 to Just $1.99
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
1,562 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 Black - Live Wallpapers: map the core Lifestyle 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 a wider range of categories and user-uploaded content.
Assumption to check: Users often find the selection of wallpapers too limited.
Validate with people who use this workflow before building.
Hypothesis 2
Implement better error handling and loading states.
Assumption to check: App may crash when loading high-resolution images.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the paywall and provide clear explanations of premium features.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to edit wallpapers or create their own.
Assumption to check: Lack of customization options for wallpapers.
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
Limited Time Offer : From $2.99 to Just $1.99 iPhone 7, iPhone X & iPhone XS Live Wallpapers. Now with the highly unique ability to generate your own live wallpaper! Also included: Product RED,Jet Black,Black,Rose Gold,Gold,Silver,Jet White and the white droplet variations, iPhone 8, iPhone X & iPhone XS Live Wallpapers. These fully animated iPhone 7 & iPhone X, XS wallpapers are truly, stunning. Deep colors make your lock screen come to life. Incredible live wallpapers inspired by incredible devices. Note: Live Wallpapers only work on devices that support 3D Touch, as of now the only devices that support 3D Touch are the following: iPhone XS Max iPhone XS iPhone X iPhone 8 Plus iPhone 8 iPhone 7 Plus iPhone 7 iPhone 6s Plus iPhone 6s If your device does not support 3D Touch you will be able to view the wallpapers and they will be animated, however you will not be able set them as live wallpapers on the lock screen. To activate the live wallpapers make sure you're not using 'low power mode' and use more pressure on the lock screen to activate the animation. All wallpapers are created and owned by Unicorn Apps. By downloading you agree to the terms of use. Read: www.unicornapps.com/black-iphone-7-live-wallpapers-terms-of-use/ Deluxe is an entire new collection that stands as a separate section of the app where we bring beautiful new, exclusive content created for you with each major release and will be also adding content that is separate from iPhone releases. Deluxe is sold as an separate in-app subscription purchase however the core of the app which is iPhone wallpapers will always be included in the app for free, forever! Deluxe allows us to bring more wallpapers to you even if you decide to never unlock it, however if you choose to do so you will support the app and get a large highly premium collection of live wallpapers that you can not get anywhere else. Payment will be charged to iTunes Account at confirmation of purchase. Account will be charged for renewal within 24-hours prior to the end of the current period, with the price of the subscription package. The subscription auto-renews unless it is turned off at least 24h prior to the end of the current subscription. Subscriptions may be managed from your Account Settings and auto renewal can also be turned off by going to your iTunes account settings after purchase at anytime. If available any unused portion of a free trial will be forfeited upon purchase of a subscription. Terms Of Use: https://www.unicornapps.com/black-iphone-live-wallpapers-terms-privacy/ Privacy Policy: https://www.unicornapps.com/black-live-wallpapers-privacy-policy/ © Unicorn Apps 2018 [email protected]
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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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.
