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
Rock Drum Machine
Turn your iPhone or iPad into a solid Rock Drummer with powerful drum sounds and tons of rhythms to get rock drum drums grooves easily in a flash
$17.99 · In-app purchases
PRICE
$17.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
516 ratings · Top 15%
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 Rock Drum Machine: 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
Introduce user-uploaded sounds and extensive editing tools.
Assumption to check: Limited sound customization options
Validate with people who use this workflow before building.
Hypothesis 2
Offer a freemium model with limited features, encouraging upgrades.
Assumption to check: High price point at $17.99
Validate with people who use this workflow before building.
Hypothesis 3
Add options to share patterns on social media or with friends.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Implement a guided tutorial for new users to explore features.
Assumption to check: No tutorial or onboarding process
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
Turn your iPhone or iPad into a solid Rock Drummer with powerful drum sounds and tons of rhythms to get rock drum drums grooves easily in a flash. The AI drum machine for Rock! RDM jams! Just move a slider to set the jamming level like a proper drummer! 2d Slider to control jam level ( x - horizontal ) and intensity ( y - vertical ) The Live Pads allows to play live sessions on the way with 8 assignable pads and buttons for fills, intro, end with midi controls. Now with assignable Midi Map, for controls and MIDI out notes. Synchronize any app easily with Ableton Link. Export Full or Multitrack Audio and Midi File, available from iOS 12. Song Mode. An easy and fast way to make quality drums for your songs. - Double press to edit a part or song - Long press to move parts or songs Save all your data to iCloud to have several song lists, rhythms or repertorios and share them among your devices Edit or create your own rhythms very easily in two modes: * Edit Mode allows you to edit the whole rhythm quickly. * Patterns Mode allows you to set the patterns for each component (hihat/ride cymbal, snare or kick )easily with a wheel. Combine the best acoustic drum sounds with any rhythm to get top inspiring rock grooves. * Midi Sync + Inter App Audio + Audiobus. Stream live audio directly to other Audiobus or Inter App Audio apps! * 4 Effects : Compressor / Gate, Equalizer , Delay, Reverb * Set random fills every 4, 8, 12 , 16, 32 bars * In Groove Edit Mode you can set any subdivision to any beats. Just long press on the time until it shows a red border and drag up or down to rest or add notes * Midi Outt --- MIDI CONTROLS --- Assignable Midi Controls. Default Controls : Play : G2 LivePads : C1 - G2 Fill + Play/Stop : A2 Fill : C2 Fill + Toggle Hats/Ride D2 Toggle Hats/Ride Db2 Fill with LivePad Change E2 Load Live Pad C3 Preview LivePad Db3 Next Live Pad D3 Select Live Pad Set Eb3 Tap Tempo Bb2 Crash Cymbal B2 Next Song Ab2 Previous Song Gb2 Jam CC 1 Intensity CC 2 Master Volume CC 7 Swing CC 11 Reverb Level CC 91 Bank CC 32 Rhythm CC 0 Soundset PC
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
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zustand
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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.
