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
SpaceCraft Granular Synth
With SpaceCraft (MIDI, MPE, AUv3, IAA) you can transform any sound into a playable musical instrument via Granular Synthesis
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
151 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 SpaceCraft Granular Synth: 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 more granular controls and presets.
Assumption to check: Limited sound customization options compared to desktop synthesizers.
Validate with people who use this workflow before building.
Hypothesis 2
Include a tutorial or guided onboarding process.
Assumption to check: High learning curve for beginners.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize audio processing for lower-end hardware.
Assumption to check: Inconsistent performance on older devices.
Validate with people who use this workflow before building.
Hypothesis 4
Add options for sharing sounds and projects with the community.
Assumption to check: Limited social sharing 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
With SpaceCraft (MIDI, MPE, AUv3, IAA) you can transform any sound into a playable musical instrument via Granular Synthesis. You can create textures, soundscapes and arpeggiated rhythms from sounds such as your voice, ambient noise or the high quality built-in audio samples. Tap the 'Input' button (top left) to record audio via your device's microphone or load a file from your device (access* to iCloud, Dropbox, Google Drive, Audioshare*** etc.). Experiment with turning everyday sounds into unusual instruments. Save your creations and corresponding samples via presets. Also, tap the 'rec' button (top right) to record your performance (maximum 20 minutes). This is used in standalone only as the AUv3 host can be used to record the output. Supports AUv3 and IAA (recommended to use in the effects slot to allow live input audio recording). * NOT COMPATIBLE with GarageBand as AUv3 (but can be loaded as Inter App Audio (IAA) or via an effects insert in the GarageBand sampler, with no MIDI capability) ** iOS11 and above provides equivalent folder access to the built-in iOS 'Files' app. Note that iOS10 and below has limited access to folders (no Audioshare folder access for iOS10 and below) *** Access to Audioshare files is done via the iOS files app
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.
