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
GRAB
GRAB は iPhone の磁気センサーで周囲の電磁波を「受信」し、音として鳴らす実験的シンセサイザーです。電源アダプタ、モーター、ディスプレイ、Wi-Fiルーターなど身の回りの電磁的なノイズを音源にして、フィールド録音のように演奏します。
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 GRAB: 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
Implement advanced algorithms for personalized playlists.
Assumption to check: Lack of personalization options
Validate with people who use this workflow before building.
Hypothesis 2
Enhance offline mode with better download management.
Assumption to check: Limited offline capabilities
Validate with people who use this workflow before building.
Hypothesis 3
Add features for sharing music on social platforms.
Assumption to check: Missing social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate voice control features for hands-free navigation.
Assumption to check: No integration with voice assistants
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
GRAB は iPhone の磁気センサーで周囲の電磁波を「受信」し、音として鳴らす実験的シンセサイザーです。電源アダプタ、モーター、ディスプレイ、Wi-Fiルーターなど身の回りの電磁的なノイズを音源にして、フィールド録音のように演奏します。 【サウンドエンジン】 ・ETHER 風の 5 層: メインハム / PWM バズ / スタティックヒス / ハイスキール / パルストレイン ・センサー連動の 3 層シンセボイス: 鋸波 / 矩形波 / ノイズ ・カメラON時はレンズへの光量変化が音量・音色のトレモロを駆動 【エフェクト】 ・CRUSH（ビットクラッシュ） ・COMB（コムフィルター） ・REVERB（残響＋シマー） ・STUTTER（BPM同期のリピート） ・各エフェクトに HOLD ラッチ機能 【Ableton Link】 ・Live / Logic / 他 iOS DAW と自動テンポ同期 ・STUTTER は Link の BPM で 1/4・1/8・1/16・1/32 拍に同期 ・公式 Link 設定画面に対応 【ビジュアル】 ・3D ポイントクラウドの周波数スペクトラム ・スペクトラムバー表示モード ・カメラON時はグレースケール映像と立体的に合成 【こんな使い方】 ・電化製品の近くで音色変化を楽しむフィールドサウンドツール ・Live セッションに加えるアトモスフェリックな効果音発生装置 ・電磁的なノイズミュージックの実験プラットフォーム 【プライバシー】 音はすべて端末内で処理され、外部に送信されません。Ableton Link はローカルWi-Fi 内のみで通信します。
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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
Supabase
Zustand
expo-av
react-navigation
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.
