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
GymVault
Your gains
$4.99 · In-app purchases
PRICE
$4.99
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 included16 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 GymVault: 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 more detailed charts and progress analytics.
Assumption to check: Difficulty in tracking progress over time
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a comprehensive food database for easier meal logging.
Assumption to check: Limited nutrition tracking options
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges and community features for motivation.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Create an interactive onboarding process with tutorials and tips.
Assumption to check: User onboarding experience is not engaging
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
Your gains. Your data. A privacy-first workout notebook with built-in progressive overload coaching. No ads, no trackers, no subscriptions. Description Stop renting your workout history. GymVault is the training notebook built for lifters who take progressive overload seriously. We believe your data belongs to you—not a cloud server, not an advertiser, and certainly not behind a monthly paywall. SIMPLE BY DEFAULT. SMART BY CHOICE. Open the app and just lift. GymVault offers a clean, fast interface for logging weights, reps, and sets. But flip the switch to "Coached Mode," and GymVault transforms from a notebook into an intelligent training partner. THE "INVISIBLE COACH" ENGINE GymVault’s progression engine uses real exercise science principles (MEV, MRV, and RIR) to manage your gains. Auto-Regulation: The app analyzes your performance and Reps In Reserve (RIR) to suggest exact weight and set increases for your next session. Double Progression: We handle the math. We track when you hit your rep ceilings and automatically graduate you to heavier loads. Fatigue Management: Prevents burnout by tracking your Volume Load against your recovery limits. MASTER YOUR MESOCYCLES Training is more than just one workout. Plan, execute, and archive full 4-8 week Mesocycles. Periodization: Structure your training blocks with planned Deload weeks. Muscle Prioritization: Tell the app which muscles you want to grow (e.g., "Chest & Back"), and the algorithm will bias volume toward those groups. Smart Sorting: The app intelligently reorders your workout to prioritize fresh muscle groups while keeping heavy compounds safe. YOUR DATA. PERIOD. 100% Offline: Your workout history lives on your device and never sent to us. Open Export: Export your entire history to CSV at any time. Analyze your own data in Excel, Python, or share it with a human coach. No Accounts: No sign-up required. Just download and lift. We won’t hold your data hostage. FEATURES AT A GLANCE: 120+ Exercise Library: From Barbell Squats to JM Presses, tagged with biomechanical metadata (Compound vs. Isolation). Equipment Aware: Filters exercises based on what you actually have in your home gym. Visual Volume Tracker: See your weekly sets per muscle group in real-time. Legacy Cloning: Clone your best Mesocycles and make them harder next time. Download GymVault today. Own your data. Earn your progress.
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
Redux
Axios
@react-navigation/native
Shadcn/ui
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.
