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
ChubbyCheck
simple weight tracking
$1.99 · In-app purchases
PRICE
$1.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 ChubbyCheck: 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
Focus on user feedback and community features to build trust.
Assumption to check: Lack of user reviews and trustworthiness
Validate with people who use this workflow before building.
Hypothesis 2
Offer unique features like social challenges and customizable workouts.
Assumption to check: Limited features compared to established apps
Validate with people who use this workflow before building.
Hypothesis 3
Implement gamification elements to enhance user interaction.
Assumption to check: User engagement might be low
Validate with people who use this workflow before building.
Hypothesis 4
Provide a free trial or freemium model to attract initial users.
Assumption to check: Paywall might deter users
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
simple weight tracking. no subscriptions. no ads. just you. your journey, your pace weight fluctuates. life happens. chubbycheck gets it. we meet you where you are without judgment or shame. trending down? calming green accents and confetti celebrations cheer you on. trending up? a gentle, motivating red theme reminds you that you’ve got this. live activity widget stay motivated at a glance! our live widget brings your journey to life right on your home screen. it adapts to your progress and even throws a mini-confetti party to celebrate your wins. lightning-fast & guilt-free log in seconds: sleek, haptic-enhanced design gets you in and out in under 5 seconds. no toxic goal setting: we don't force aggressive goals or shame you. track at your own pace. complete history: visualize your trends with beautiful, interactive charts. privacy first & data owned your weight is nobody’s business. unlike other apps, we don’t collect, store, or sell your data. everything stays 100% on your device. no accounts. no servers. no tracking. one price. forever. most apps want to rent you your own data. we reject that model. pay once, own it forever. no subscriptions. no in-app purchases. no ads. chubbycheck costs less than one month of those subscription apps. download today! simple, private and honest
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
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Firebase
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.
