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
Nebula - Live Wallpapers
Temporary promotional sale from $2.99 to just $0.99
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
251 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 Nebula - 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
Increase content variety and update frequency.
Assumption to check: Limited wallpaper selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for older devices.
Assumption to check: Occasional app crashes on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Implement advanced search and filtering capabilities.
Assumption to check: Difficulty in finding specific wallpapers
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations and previews of premium features.
Assumption to check: In-app purchases can be confusing
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
Temporary promotional sale from $2.99 to just $0.99. Don't miss it. The Worlds Best Collection Of Live Wallpapers for iOS. Nebula is a collection of some of the most stunning, mesmerizing, most sought out live wallpapers on the App Store. High quality, fluid animations and vibrant colors that are unmatched,really! We've also included a highly unique feature that allows you to Generate Live Wallpapers using your favorite music or voice. You can then send those to your loved ones and they'll have the waveform generated by your sound animating their wallpaper that they'll see hundreds of times a day! We’ve set out to create,acquire the worlds most unique and best Live Wallpapers. With Nebula we’ve created, acquired,curated some of the best live wallpapers with the help of some of our users. We started with a large library of wallpapers and curated them and now we’ve got the very best and we’re going to be bringing more and more as we shift more of our attention from the development phase to the launch phase. We’re exited to bring another Live Wallpapers app and this one is our best one yet! 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 X iPhone 8 Plus iPhone 8 iPhone 7 iPhone 7 Plus iPhone 6s iPhone 6s Plus 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, but only as stills. 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 either created, owned or licensed by Unicorn Apps. By downloading you agree to the terms of use. Read: www.unicornapps.com/nebula-terms-of-use/ If you have any questions please reach out at: [email protected] © Unicorn Apps 2017
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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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
Axios
React Navigation
React Native Reanimated
BUILD KIT DIFFICULTY
Intermediate
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.
