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
40Hz Gamma
40Hz Gamma — Advanced Brain Stimulation
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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.
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'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 40Hz Gamma: 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
Create a feedback system for users to rate and comment on sessions.
Assumption to check: Lack of user reviews and feedback on effectiveness
Validate with people who use this workflow before building.
Hypothesis 2
Offer a wider range of sound therapy sessions and user-generated content.
Assumption to check: Limited session variety
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription options and provide clearer value propositions.
Assumption to check: Subscription complexity
Validate with people who use this workflow before building.
Hypothesis 4
Implement social sharing and community features for users to connect.
Assumption to check: Absence of social features
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
40Hz Gamma — Advanced Brain Stimulation Experience the future of cognitive wellness with 40Hz Gamma, a professional tool designed for multisensory 40Hz stimulation. Grounded in modern neuroscience research, our app provides precisely calibrated audio and visual signals to help you reach states of deep focus and tranquility. Key Features Professional Audio Modes: - **Standard Gamma Base (Pure Tone)**: The cleanest 40Hz signal for baseline training. - **Strong Pulsatile Rhythms (Isochronic)**: Sharp rhythmic pulses for powerful engagement. - **Inter-Hemispheric Sync (Binaural Beats)**: Guides hemispheric synergy via precision frequency offsets. - **Envelope Neuromodulation (AM)**: Smooth 40Hz amplitude modulation of a high-frequency carrier. - **Monotic Summation (Monaural Beats)**: Creates physical interference through combined signals in each ear. Advanced Gamma Visuals: - **Global Sync (Square Wave)**: Uniform full-field stimulation for standard synchronization. - **Harmonic Fade (Sine Wave)**: Smooth sinusoidal transitions for a gentler experience. - **V1 Cortex Drive (Drifting Grating)**: Uses directional motion to strengthen primary visual cortex activation. - **Centric Focus Pulse (Radial Pulse)**: Expanding patterns for centering focus and attention. - **High-Sensitivity Entrainment (Checkerboard)**: Maximizes response using high-contrast phase inversion. - **Multi-Dimensional Integration (Mixed Mode)**: Blends patterns dynamically to prevent neural adaptation. Precision Tuning: Fine-tune the stimulation frequency between 38Hz and 42Hz (default 40Hz) in settings to find your optimal resonance. Rich Ambient Library: High-quality white noise including Rain, Ocean, Forest, and more. Advanced Mixer: Seamlessly blend 40Hz waves with your favorite ambient sounds. Privacy First: Fully offline, no data collection, and no trackers. Safety Warning & Disclaimer IMPORTANT: PHOTOSENSITIVE EPILEPSY WARNING This app contains 40Hz flashing lights. Do not use this app if you have a history of seizures or photosensitive epilepsy. Discontinue use immediately if you experience dizziness or discomfort. Medical Disclaimer: This app is intended for wellness and research purposes only and does not provide medical diagnosis or treatment. It is not a medical device. Always seek a doctor’s advice before making any health-related decisions.
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
Zustand
Axios
React Navigation
Expo AV
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.
