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
Marshall Bluetooth
Things have moved on
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
15,420 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 included18 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 Marshall Bluetooth: map the core Music 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 compatibility checker for devices before connection.
Assumption to check: Limited device compatibility with certain Bluetooth speakers.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a real-time audio quality monitor.
Assumption to check: Inconsistent audio quality during playback.
Validate with people who use this workflow before building.
Hypothesis 3
Add an onboarding tutorial to guide users through the app.
Assumption to check: Lack of user tutorials for new features.
Validate with people who use this workflow before building.
Hypothesis 4
Enable offline playback for downloaded songs.
Assumption to check: No offline mode for playing previously downloaded songs.
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
Things have moved on. There’s no longer just a dial to twist when your favourite song comes on, then guard to make sure no one else touches it. With the app, you can crank up the volume from the kitchen and there’s nothing anyone can do about it. It’s using the powers of technology for good, and ultimately with you in control, better playlists for all. And if apps aren’t your thing, you can still use our products without it. Using the app is simple. Just connect your devices, adjust the volume, and get on with your life. You can fiddle with more detailed adjustments if you’re that way inclined, like equalisers and noise control for headphones – everything is there to help create your perfect fit. Our app supports these products: Stockwell III Milton A.N.C. Bromley 450 Bromley 750 Middleton II Kilburn III Monitor III A.N.C. Emberton III Willen II Minor IV Major V Motif II A.N.C. Middleton Minor III Acton III Bluetooth Stanmore III Bluetooth Woburn III Bluetooth Emberton II Willen Motif A.N.C. Mode II Monitor II A.N.C. Acton II Bluetooth Stanmore II Bluetooth Woburn II Bluetooth
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
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react-native-slider
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.
