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
Walliz – DIY Wallpaper Collage
Walliz – DIY Wallpaper Collage – Create Your Own Aesthetic Screen
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
873 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Walliz – DIY Wallpaper Collage: map the core Graphics & Design 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
Provide more templates and editing tools.
Assumption to check: Limited wallpaper customization options
Validate with people who use this workflow before building.
Hypothesis 2
Ensure high-resolution output for saved wallpapers.
Assumption to check: Inconsistent image quality when saved
Validate with people who use this workflow before building.
Hypothesis 3
Implement guided onboarding to help new users.
Assumption to check: User onboarding is unclear
Validate with people who use this workflow before building.
Hypothesis 4
Limit ads and offer a premium ad-free subscription.
Assumption to check: Frequent ads disrupt user experience
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
Walliz – DIY Wallpaper Collage – Create Your Own Aesthetic Screen Turn your phone into a creative canvas with Walliz – DIY Wallpaper Collage. Designed for users who love wallpaper, diy, photo, and collage, this app helps you create stunning, personalized backgrounds that truly reflect your mood and personality. 1. DIY Wallpaper Maker – Design Your Style Create unique wallpapers in just a few taps. Import photos from your gallery, add frames, stickers, and layouts, then customize colors and backgrounds to craft your perfect DIY wallpaper. From minimal aesthetics to trendy designs, this custom wallpaper maker lets you design wallpapers that feel personal and creative. 2. Photo Collage & Wallpaper Collage Tell your story with a photo collage. Combine multiple photos, arrange layouts freely, and design beautiful wallpaper photo collages for your home screen or lock screen. Whether you want a collage lock screen wallpaper or a creative photo background, our collage tools give you full freedom. 3. Widgets & Lock Screen Customization Enhance your screen with stylish photo widgets and lock screen widgets. Pair your wallpaper with matching widgets to create a complete aesthetic home screen experience. [Creative Tools Made for Fun] [Explore powerful yet easy tools to edit, craft, and customize:] - Stickers, frames & trendy elements - Background editor & DIY background maker - Creative layouts for photos and collages - Live wallpaper maker for dynamic screens Perfect for users who love craft, creative, fun, and unique designs. [Explore Trendy Wallpapers] Browse a diverse gallery of ready-made wallpapers from aesthetic moods and cute characters to trendy collage styles and creative backgrounds. New wallpapers are added regularly to keep your screen fresh. [Why You’ll Love Walliz – DIY Wallpaper Collage] - Easy to use DIY wallpaper & collage tools - Perfect for aesthetic, trendy, and creative users - Customize wallpapers, photos, widgets, and layouts - Make your phone background truly yours UNLIMITED ACCESS MEMBERSHIP SUBSCRIPTION • Some premium wallpaper templates require a subscription or rewarded ad access. • You can subscribe to unlock all premium content and features within Walliz - DIY Wallpaper Collage. • Subscriptions are billed weekly or yearly depending on the selected plan. • You can cancel your subscription via this URL: https://support.apple.com/en-us/HT202039 Download now and start creating stunning Wally DIY Wallpaper, photo collages, and creative backgrounds that match your vibe. Privacy Policy: https://sites.google.com/leansoft.io/diy-wallpaper-maker-collage/home Terms of Service: https://sites.google.com/leansoft.io/diy-wallpaper-collage-maker/home
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
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.
