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
Merbella App
Welcome to the official Merbella App — your all-in-one destination for
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
12 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 included16 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 Merbella App: map the core Shopping 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
Implement advanced filtering options and personalized recommendations.
Assumption to check: Limited product discovery features such as sorting and filtering
Validate with people who use this workflow before building.
Hypothesis 2
Add a review and rating system to enhance credibility.
Assumption to check: Lack of user reviews and ratings for products
Validate with people who use this workflow before building.
Hypothesis 3
Integrate real-time order tracking with notifications.
Assumption to check: Poor order tracking capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Provide in-app chat support and FAQ sections.
Assumption to check: Inadequate customer support options
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
Welcome to the official Merbella App — your all-in-one destination for professional silicone mermaid tails, costumes, and accessories by Merbella Studios. Buy, sell, and connect with the largest community of mermaid tail collectors and performers — all in one app. WHAT'S INSIDE: News Feed Stay connected with exclusive posts, announcements, and behind-the-scenes updates directly from Mermaid Raven and the Merbella Studios team. The Mermaid Cave Shop exclusive Merbella creations — hyper-realistic silicone mermaid tails, crowns, tops, and accessories. Browse listings, make offers, and purchase rare and one-of-a-kind pieces. Custom Order Applications Ready for your dream tail? Apply for a custom silicone mermaid tail, top, or accessory — handcrafted by Merbella Studios just for you. Client Portal Custom order clients can track production progress in real time and chat directly with the Merbella team from application through delivery. The Merbella Marketplace The peer-to-peer marketplace for buying and selling pre-loved Merbella silicone tails, tops, headdresses, and accessories. Stripe-powered payments with seller ratings and buyer protection. Gallery (Coming Soon) Browse a curated gallery of Merbella Studios products — silicone mermaid tails, tops, crowns, and accessories — all in one beautifully organized collection. Exclusive Giveaways Enter for a chance to win free Merbella pieces through members-only in-app giveaways. Whether you're a professional mermaid performer, collector, or just getting your first tail — the Merbella App is everything a mermaid needs, in one place. Download free. Subscription required for full access. Terms and pricing available at signup. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
Supabase
Zustand
React Navigation
React Native Reanimated
BUILD KIT DIFFICULTY
Expert
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.
