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
FitnUS Goals
FitnUS Goals lets you create a monthly workout goal, track progress in a clean calendar view, and share it with friends
$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'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 FitnUS Goals: 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
Incorporate regular prompts for user feedback and community support.
Assumption to check: Lack of user feedback on progress
Validate with people who use this workflow before building.
Hypothesis 2
Provide a wide database of exercises and meals with quick search capabilities.
Assumption to check: Limited exercise and meal logging options
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges and leaderboards to enhance user engagement.
Assumption to check: No social features for motivation
Validate with people who use this workflow before building.
Hypothesis 4
Offer detailed analytics and insights on user progress with personalized recommendations.
Assumption to check: Inadequate analytics on user progress
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
FitnUS Goals lets you create a monthly workout goal, track progress in a clean calendar view, and share it with friends. Workouts are pulled automatically from your existing Apple Health data that is populated by your Apple Watch or other fitness trackers. Sharing requires an Apple ID with iCloud storage, and everything stays private between you and the people you choose. No accounts, no third-party servers. Your data never leaves Apple's ecosystem. Key Features - Set a flexible monthly workout goal by day, week, or total count - Calendar view shows progress at a glance, month by month - Share progress with friends or family via iCloud - Customize your app's color and the color used for each friend's workouts - Group your friends and view only their workouts - Give your friends nicknames including emojis - Filter your goal by specific activity types, including runs, swims, lifts, and more - View all your workouts, and manually include or exclude any workout from your goal - Tap a date to view only the workouts from that day
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-native-reanimated
@supabase/supabase-js
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.
