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
BrainGamma40Hz
BrainGamma40Hz is an experimental iOS app that delivers a calming, variable and rhythmic light experience using your device’s flashlight, inspired by brainwave entrainment research.
$1.99 · In-app purchases
PRICE
$1.99
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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/
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 BrainGamma40Hz: 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
Include a wider variety of frequencies and sounds to enhance user engagement.
Assumption to check: Limited audio options for different frequencies
Validate with people who use this workflow before building.
Hypothesis 2
Add social features to share sessions and progress with friends.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven recommendations for sessions based on user history.
Assumption to check: No personalized 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
BrainGamma40Hz is an experimental iOS app that delivers a calming, variable and rhythmic light experience using your device’s flashlight, inspired by brainwave entrainment research. Choose session durations (10–30 minutes) and relax in a dimly lit environment. Perfect for users seeking a unique wellness experience. Warning: If you have any photosensitivity issue please consult a doctor before use the app. Use with eyes closed and position the device 10–20cm from your face. Features: - Customizable session duration (10–30 minutes). - Variable frequencies strobe light with adjustable intensity. - Meditative audio tracks to enhance relaxation. - HealthKit integration to log session time as Mindful Minutes. - Safety-focused instructions and warnings. - Video Sessions: whenever you don't have the possibility to join a proper rhythmic light session because you can't access a dark environment or simply because you are on the go, you can still partially enjoy the benefits of the brainwave entrainment with a video session. Choose the video you prefer from your library and enjoy - Binaural Beats: make your brainwave entrainment experience more intense adding binaural beats as part of the entrainment stimulation session. FDA Disclaimer: This app is not FDA-approved and not intended to diagnose, treat, cure, or prevent any disease. Use at your own risk and consult a healthcare professional. Safety Tips: - Use in a dark environment with eyes closed. - Adjust light intensity for comfort. - Stop immediately if you feel discomfort or dizziness. BrainGamma40Hz uses only the device’s flashlight to deliver light patterns and does not use iOS sensors for health measurements. Learn More: Visit our support page for details and safety information.
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
Supabase
zustand
victory-native
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.
