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
ClassPass: Fitness, Spa, Salon
Download ClassPass today to book fitness classes & appointments at the top studios, gyms, salons, and spas near you!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
198,008 ratings · Top 5%
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 included17 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 ClassPass: Fitness, Spa, Salon: 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 a feature to notify users about new classes or studios nearby.
Assumption to check: Limited availability of classes in certain locations
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a pay-per-class option or lower commitment plans.
Assumption to check: Subscription cost may be high for casual users
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the booking flow with guided steps and clearer options.
Assumption to check: Complex booking process can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Utilize user behavior data to provide tailored service suggestions.
Assumption to check: Lack of personalization in service recommendations
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
Download ClassPass today to book fitness classes & appointments at the top studios, gyms, salons, and spas near you! How it works: • Download the free ClassPass app. • Sign up for a trial and get credits to try activities like yoga, pilates, gym visits, and more from some of our top-rated businesses. • Browse studios, gyms, salons, & spas near you (pro tip: filter by reservation type, location, time, & more to easily find what you’re looking for!). • Book classes & appointments instantly without needing to create additional accounts or enter payment details. • After your trial, customize a plan that works best with your fitness & wellness routine. • Roll over unused credits up to the number of credits in your next month’s plan. How to make the most of your membership: • Access thousands of the world’s leading fitness studios, gyms, salons and spas including CorePower Yoga, [solidcore], PureBarre, Glosslab, & more! • Browse a list of recommended studios, gyms, salons, & spas curated just for you. • Bookmark your favorites. • Invite friends to class and earn rewards. • Connect with friends who are already on ClassPass. • Receive badges to celebrate your milestones and share them with friends. • Read reviews & ratings to know what to expect with each reservation. ClassPass is available in more than 2,500+ locations including: USA, Canada, Australia, New Zealand, United Kingdom, Ireland, France, Germany, Netherlands, Spain, Portugal, Switzerland, Austria, Sweden, Denmark, Finland, Norway, Singapore, Hong Kong, Malaysia, Thailand, Indonesia, Philippines, China, India, the United Arab Emirates, Brazil, Argentina, & Chile.
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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
React Navigation
Axios
Zustand
Firebase
BUILD KIT DIFFICULTY
Expert
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.
