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
WallZen - Wallpaper 4K & HD
WallZen – Wallpaper 4K & HD brings you a premium collection of high-quality wallpapers to personalize your iPhone with stunning visuals.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.2
49 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 included15 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 WallZen - Wallpaper 4K & HD: map the core Utilities 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
Expand wallpaper library with user submissions.
Assumption to check: Limited wallpaper selection compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize image loading and caching.
Assumption to check: Low app performance and loading times.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and improve layout.
Assumption to check: Cluttered UI and hard to navigate.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a balanced ad strategy and clearer value for in-app purchases.
Assumption to check: Frequent ads and paywalls deter users.
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
WallZen – Wallpaper 4K & HD brings you a premium collection of high-quality wallpapers to personalize your iPhone with stunning visuals. Explore a wide range of beautifully curated wallpapers across multiple categories including abstract designs, animals, anime, and many more. With a growing library of 4K and HD wallpapers, you’ll always find something that matches your style and mood. Key Features • 4K & HD Quality Enjoy high-resolution wallpapers optimized for all iPhone screens. • Wide Variety of Categories Browse through 30+ categories such as Abstract, Animals, Anime, and more. • Easy to Use Simple and clean interface for smooth browsing and quick wallpaper selection. • Regular Updates New wallpapers are added frequently. • Fast and Lightweight Optimized for performance and smooth experience. Personalize Your Device Choose from a variety of styles including minimal, colorful, artistic, and trending designs. Easily set wallpapers for your home or lock screen. Disclaimer All wallpapers in this app are for personal use only. Content is either created, licensed, or sourced from publicly available resources. If you believe any content violates your rights, please contact us for prompt removal. Why Choose WallZen? WallZen focuses on quality, simplicity, and a smooth user experience to help you discover and use beautiful wallpapers every day.
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
React Navigation
Redux
Firebase Storage
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.
