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
YMCA On the Go
PLEASE NOTE: You need a YMCA On the Go account to access this App
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
3,731 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 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 YMCA On the Go: 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 integrations with popular fitness trackers and wearables.
Assumption to check: Limited integration with third-party fitness devices
Validate with people who use this workflow before building.
Hypothesis 2
Standardize UI elements and navigation patterns.
Assumption to check: Inconsistent user experience across different screens
Validate with people who use this workflow before building.
Hypothesis 3
Enhance search functionality and filtering options.
Assumption to check: Difficulty finding specific workouts or classes
Validate with people who use this workflow before building.
Hypothesis 4
Introduce social features such as challenges and leaderboards.
Assumption to check: Lack of community features for motivation
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
PLEASE NOTE: You need a YMCA On the Go account to access this App. This App is designed for Facility and Community Members of the Greater Joliet Area YMCA. Facility Members of the Greater Joliet Area YMCA get access to this exciting fitness tool included with their Y membership. Because we know that healthy lifestyles are best achieved by nurturing our mind, body and spirit, well-being and fitness at the Y is so much more than just working out. Begin your journey to a heathier lifestyle with the assistance of the YMCA On the Go App. This comprehensive fitness platform will provide you with: - YMCA class and facility schedules - The opportunity to reserve a spot in your favorite fitness class - Access to virtual classes - Daily workouts - 3D exercise demonstrations - Exclusive YMCA member challenges - Nutrition information - Access to the latest YMCA news and updates You can also sync the YMCA On the Go app with your personal devices to track your workouts at the Y, at home, or on the go! From cardio to strength, this interactive fitness tool will provide you with the support you need to set and achieve your health and wellness goals. You can sync this app with Apple Health App. If you enable this connection, any workout in the Health app with automatically be added to your Activity Calendar.
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
react-navigation
expo-calendar
zustand
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.
