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
Haptic Metronome
Haptic Metronome is a visual/haptic first digital metronome.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
4 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 Haptic Metronome: 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
Expand sound library with user-uploaded sounds.
Assumption to check: Limited sound options for metronome.
Validate with people who use this workflow before building.
Hypothesis 2
Add visual cues for beat tracking.
Assumption to check: Lack of visual metronome indicators.
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable time signatures in settings.
Assumption to check: No option for customized time signatures.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce sharing options for settings and favorite tempos.
Assumption to check: No social features for sharing settings or tempos.
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
Haptic Metronome is a visual/haptic first digital metronome. It pulses beats with both a visual reference and a haptic feedback pattern. You can optionally switch on/off the audio. It offers a very convenient and straightforward setup for your time signature, tempo (both by selecting a specific tempo, or using the Tap Tempo feature). It is very easy to setup groupings of beats by enabling an *accent* per each beat so that it pulses stronger and creates the perfect pattern you need for your music. It is currently available for iOS and iPadOS. *I'm currently working on bringing the experience on watchOS and macOS* Haptic Metronome supports Spotlight research, it exposes few presets to start a metronome with home screen quick actions. It also supports handoff between the two platforms so that you can continue a session on the other device with the same settings you had set on the previous one. Enjoy your playing! And, please send me any kind of feedback at [Luca Strazzullo](mailto:[email protected])
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
expo-av
expo-haptics
react-navigation
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.
