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
Massager - Joyful Vib Stick
no advertisements, no in app purchases, no data collection, completely free!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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/
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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 Massager - Joyful Vib Stick: 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
Expand the library of techniques and provide user-generated content.
Assumption to check: Limited techniques available
Validate with people who use this workflow before building.
Hypothesis 2
Implement user profiles that allow for customized recommendations.
Assumption to check: Lack of personalization
Validate with people who use this workflow before building.
Hypothesis 3
Add a feature for users to rate techniques and provide feedback.
Assumption to check: No feedback mechanism
Validate with people who use this workflow before building.
Hypothesis 4
Clarify pricing and provide a free trial for premium features.
Assumption to check: In-app purchases can be confusing
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
no advertisements, no in app purchases, no data collection, completely free! transform your iphone into a premium vibration massager with imassager - the sophisticated massage app designed for personal wellness and relaxation. key features: • 9 massage patterns - from gentle harmony to dynamic wildfire, each vibration pattern crafted for different massage experiences • biometric security - face id/touch id protection ensures your privacy • real-time control - precise vibration intensity adjustment from 5% to 150% • 7 beautiful themes - customize your massager experience with stunning color schemes • silent mode respect - automatically adapts to your device settings • offline privacy - no data collection, no network requests, completely private vibration massage patterns: harmony: gentle continuous vibration for daily relaxation whisper: soft pulsing massage for stress relief crescendo: gradually building vibration intensity wildfire: dynamic vibration bursts for energy release staccato: sharp rhythmic massage pulses shimmer: delicate high-frequency vibrations tidal: deep rolling wave massage patterns tempest: unpredictable storm-like vibration variations symphony: complex layered massage harmonies privacy first: your massage sessions stay completely private. all data remains on your device with military-grade biometric protection.
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
React Navigation
Zustand
Expo Audio
React Native Slider
BUILD KIT DIFFICULTY
Starter
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.
