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
My Star Mugs
Keep track of your entire mug collection — not just city mugs — all in one place.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
Build your own version
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 included14 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 My Star Mugs: 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
Incorporate gamification elements like achievements for using the app.
Assumption to check: Limited user engagement and retention
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the Create feature with more customizable options.
Assumption to check: Difficulties in customizing designs
Validate with people who use this workflow before building.
Hypothesis 3
Optimize image handling and loading for better performance.
Assumption to check: Poor performance with large image uploads
Validate with people who use this workflow before building.
Hypothesis 4
Implement features to share mug designs on social media.
Assumption to check: Lack of social sharing features
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
Keep track of your entire mug collection — not just city mugs — all in one place. Upload photos of your mugs, organise your collection, and show it off to fellow collectors. Connect with others, share your favourite finds, and message other mug enthusiasts to swap tips, stories, and must-have mugs. Perfect for passionate collectors who want to showcase, share, and connect with the mug community. My Star Mugs Pro Take your collection to the next level with My Star Mugs Pro. Unlock access to the full current collection of 2,500+ mugs and powerful tools designed for serious collectors: - Instantly add mugs from the full global collection - Mark mugs you already own - Build and manage your personal wanted list - Easily move mugs from your wanted list to your collection All future Pro updates included. My Star Mugs is an independent, fan-made app created for collectors of Starbucks® mugs. It is not affiliated with, endorsed by, or sponsored by Starbucks Corporation or any of its subsidiaries. All trademarks, names, and logos remain the property of their respective owners.
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
TypeScript
React Navigation
Zustand
BUILD KIT DIFFICULTY
Starter
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.
