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
Peggy Cat - A Virtual Pet
A Little Pet Living on Your Wrist
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
107 ratings · Top 30%
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 Peggy Cat - A Virtual Pet: map the core Entertainment 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
Add more mini-games and activities to engage users.
Assumption to check: Limited interaction options for pets.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce daily challenges or quests for rewards.
Assumption to check: Repetitive tasks can become boring.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a sharing feature for users to show off their pets.
Assumption to check: Lack of social features.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to customize pet appearances and accessories.
Assumption to check: Limited customization options for pets.
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
A Little Pet Living on Your Wrist Meet your new best friend A pet that lives inside your Apple Watch Every step you take helps your pet grow. Every choice you make shapes its future. Walk, work, decorate, study, make friends, fall in love Your pet’s life begins now. Walk in Real Life. Grow in Game. • Your daily steps are converted into in game energy • Just carry your iPhone and Apple Watch and your pet grows along with you • Step data is synced from Apple Health with your permission Raise Your Pet from Egg to Adult Your pet grows through real life stages: • Egg • Baby • Child • Adult Care for your pet through daily life: • Feed it • Clean it • Bathe it • Let it sleep • Heal it when it gets sick • Make it happy Your care affects its mood, health, and future. Build a Life in Town Explore a living town filled with places to visit: • Go to school to increase education • Work different jobs • Cook in your kitchen • Plant crops in your garden • Buy clothes and furniture • Drive cars to travel faster • Visit friends • Decorate your home • Relax at hot springs • Have fun at the amusement park • Play mini games • Travel and win big prizes No two pets live the same life. Choose Your Career When your pet grows up, it can get a job based on education level: • Waiter • Courier • Office worker • Scientist • Earn coins and unlock better lifestyles • Working consumes mood points Fall in Love and Get Married • Give gifts • Build relationships • Become lovers • Buy a ring • Get married in the church Create your own life story. Play Mini Games. Earn Rewards. • Multiple mini games inside the game center • Some games are available as standalone Apple Watch apps Play Anywhere. Sync Anytime. • Works on Apple Watch and iPhone • iCloud cloud save supported • Game data sync between Watch and Phone • Switch devices anytime without losing progress Designed for Apple Watch • Full experience on your wrist • Optimized for short play sessions • Real time status via watch complications • Digital Crown menu control Your Movement Has Meaning • Apple Health data is used only with permission • Step data is used only for in game rewards • No personal data is stored or shared Your activity turns into growth. Your movement becomes life.
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
Advanced
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.
