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
Reggae Drummer
reggae drummer brings warm jamaican rhythms to your ipad and iphone, with lot of new features.
$17.99 · In-app purchases
PRICE
$17.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
158 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 Reggae Drummer: 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
Offer a free trial period or a freemium model.
Assumption to check: High price point for users compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement user-generated content or community sharing.
Assumption to check: Limited drum kits and patterns available
Validate with people who use this workflow before building.
Hypothesis 3
Add offline access for purchased kits.
Assumption to check: No offline access to purchased kits
Validate with people who use this workflow before building.
Hypothesis 4
Include an onboarding tutorial or demo.
Assumption to check: Complexity for new users to understand all features
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
reggae drummer brings warm jamaican rhythms to your ipad and iphone, with lot of new features. - drums for reggae, ska, dub, backbeat, fusion .... - three drummers in one. barret, sly and stewart. modern, classic and contemporary reggae drums. choose the drumming style that fits best in your music and change between them to get inspired. -new audio - midi export feature. get multi-track or full mix in seconds. - adds a new reggae bank to ibassist with more than 60 bass lines. - delay and reverb send effects creates warm reggae and dub environments. - jam effects will add delay and reverb sends on the way depending on the level you can adjust. - humanize velocity to get more human authentic sound. - icloud backups. - live pads with rhythm, jam and effects parameter to play live and control by midi messages. - song mode. --- 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.
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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.
