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
PetScale App
Does your pet weigh what they should?
$19.99 · In-app purchases
PRICE
$19.99
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.
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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 included16 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 PetScale App: map the core Health & Fitness 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 multi-pet support for better tracking.
Assumption to check: Difficulty in tracking multiple pets' weights
Validate with people who use this workflow before building.
Hypothesis 2
Enhance charts with more insights and comparisons.
Assumption to check: Limited visual representation of weight trends
Validate with people who use this workflow before building.
Hypothesis 3
Add notifications for weight logging reminders.
Assumption to check: User engagement may drop without reminders
Validate with people who use this workflow before building.
Hypothesis 4
Offer a freemium model with basic features to attract users.
Assumption to check: Subscription model can be seen as expensive
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
Does your pet weigh what they should? PetScale is the smart, science-backed weight tracker built for pet owners who want more than a number on a scale. By combining your pet's species, breed, gender, and age, PetScale calculates a personalized healthy weight range and gives you the tools and guidance to help your pet reach — and stay at — their ideal weight. Because every pet is different. A 2-year-old male Labrador and a 9-year-old female Beagle don't share the same health benchmarks. PetScale knows that, and your recommendations reflect it. ~Breed & Profile-Specific Weight Tracking Add your pet's profile once and let PetScale do the rest. We factor in species, breed, gender, and age to determine what a healthy weight actually looks like for your pet — not an average animal. ~Weight History & Progress Charts Log weights over time and watch your pet's journey unfold. Easy-to-read charts show trends at a glance so you can celebrate progress and catch concerns early. ~Personalized Goal Recommendations Whether your pet needs to lose, gain, or maintain their weight, PetScale provides tailored tips on feeding portions, activity level, and lifestyle adjustments — updated as your pet ages and changes. ~Appointment Reminders Set reminders for vet visits, annual checkups, grooming appointments, dental cleanings, and more. PetScale keeps your pet's care calendar organized so nothing slips through the cracks. ~Supports a Wide Range of Pets & Breeds Dogs, cats, and more — PetScale is built to support hundreds of breeds across multiple species, so every pet in your home gets personalized attention. ~Clean, Simple Dashboard See your pet's current weight, goal weight, progress, and upcoming appointments all from one clean home screen. No clutter. No confusion. PetScale is perfect for: ~Pet owners managing a dog or cat's weight under vet guidance ~New pet parents learning what healthy looks like for their breed ~Multi-pet households tracking several animals at once ~Anyone who wants a simple way to stay on top of their pet's wellness Your pet can't tell you they're uncomfortable. Their weight can. Download PetScale today and give your pet the healthy life they deserve.
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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
Zustand
Recharts
React Navigation
Expo Image Picker
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.
