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
Volume Boost – Sound Amplifier
Use the power of your smartphone and latest technologies for maximum sound amplification
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.3
3,663 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.
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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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Volume Boost – Sound Amplifier: map the core Medical 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 more customizable equalizer settings.
Assumption to check: Limited audio enhancement options
Validate with people who use this workflow before building.
Hypothesis 2
Optimize app performance for various device types.
Assumption to check: Inconsistent performance across devices
Validate with people who use this workflow before building.
Hypothesis 3
Simplify subscription options and provide clearer UI.
Assumption to check: Complex subscription management
Validate with people who use this workflow before building.
Hypothesis 4
Add onboarding tutorials for new users.
Assumption to check: Lack of user guidance
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
Use the power of your smartphone and latest technologies for maximum sound amplification. Increase the volume and improve the sounds around you. App helps you to improve your sound perception. The app adjusts to specific features for each ear using a built-in test. You only need a simple headset to use it. -- Boost the sound of your headset -- Noise filtering function -- Automatic adjustment to hearing specifics; -- Adaptation to different types of environment; -- Full acoustic amplification up to 30 dB with a wired headset; -- Amplification of quiet sounds without losing the overall volume; -- Support of Bluetooth headsets and Air Pods. PLEASE PAY ATTENTION that the app is not intended for medical use, to obtain accurate data please consult your doctor. Do not delay the visit to your doctor if you have some problems with your hearing. ———— * Subscription Volume Boost – Sound Amplifier get access to all functions of the application. * You can turn off the auto-renewal at any time: you'll find the option to do this change to a different payment plan in the settings of your iTunes and App Store account. * The first time you can try the free trial for 3 days. After that, your account will be automatically charged for the subscription if you will not stop it before the end of the free trial. * The length of the subscription is 1 month, this subscription is auto-renewing. You can stop the subscription at any moment; * Account will be charged for renewal within 24-hours prior to the and of the current period, and identity the cost of the renewal. ATTENTION: before you subscribe please read: Privacy Policy(https://omniapp.ru/privacy) Terms Of Use(https://omniapp.ru/tos)
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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
React Native Reanimated
Expo Audio
BUILD KIT DIFFICULTY
Advanced
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.
