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
VASA Fitness Mobile
The VASA Fitness app provides every feature you need to have the perfect VASA gym experience
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
9,757 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.
Build your own version
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 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 VASA Fitness Mobile: 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 local caching and offline mode.
Assumption to check: Limited offline functionality when no internet is available
Validate with people who use this workflow before building.
Hypothesis 2
Enhance the navigation and filtering options.
Assumption to check: Confusing navigation between various workout types
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize their fitness plans.
Assumption to check: Lack of personalization for workout and nutrition plans
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate more robust progress tracking features.
Assumption to check: Difficult to track progress over long periods
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
The VASA Fitness app provides every feature you need to have the perfect VASA gym experience. Check into your gym with your phone, view and book classes and KidCare from home with a few taps, and manage your account. We are continually working to update this app to create the best experience for you. MEMBER BARCODE • Use the app to easily and quickly access your member barcode and check into your VASA gym fast. SCHEDULING • View your own personal calendar inside the app. • Search the gym schedule for classes and KidCare. • Book classes and KidCare appointments. • Cancel appointments with ease. KIDCARE • Add/Update/View your KidCare information. • Book KidCare appointments in advance to guarantee your spot! YOUR ACCOUNT • View your Plan details. • Make Changes to your account including upgrades. LOCATIONS • View your home gym or any gym location details.
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
Firebase
Redux
React Navigation
Axios
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.
