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
iMPC for iPhone
Turn your iPhone into an MPC with more than 600 samples, 47 editable programs, 80 editable sequences, and iconic MPC workflow.
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.8
84 ratings · Below Average
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 iMPC for iPhone: 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
Provide a broader range of samples and allow user uploads.
Assumption to check: Limited sample library compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement better error handling and optimized audio processing.
Assumption to check: Bugs during playback or recording
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the UI and add onboarding tutorials.
Assumption to check: Complex interface for new users
Validate with people who use this workflow before building.
Hypothesis 4
Clear pricing and sample descriptions for all in-app purchases.
Assumption to check: In-app purchases can be confusing
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 into an MPC with more than 600 samples, 47 editable programs, 80 editable sequences, and iconic MPC workflow. Need help? Have an issue or question? Please email us at [email protected]. iMPC brings the look and feel of the classic Akai Pro MPC to your iPhone. iMPC includes everything you need to create a beat quickly and easily. With features including built-in effects, plus the ability to create new sequences and record and overdub beats, the possibilities are endless. The app’s built-in sampler can record samples three different ways: using the mic on the iPhone, using the line input on the iPhone, or using the multi-touch turntable interface in iMPC to record samples directly from iTunes or other music libraries. - Exclusive iMPC sound set and classic Akai Professional sound library - "3D Perform" controls -- use your iPhone's motion sensors to control parameters - Export tracks to MPC Software for use with MPC Renaissance and MPC Studio - Share on SoundCloud, Facebook, Twitter, Tumblr, or export to your computer - 16 Levels mode: 16 levels of attack, velocity, length, and tuning - Note Variation slider: adjust attack, velocity, length, and tuning as you play - Trim and categorize samples, undo takes and erase samples - Create new sequences, record and overdub beats - Live Sequence queuing for real-time performance and playback - Simple drag and drop program creation - Effects include delay, bit crusher, master compressor/limiter - Time correct: 1/8 note - 1/32T with variable swing - Note Repeat: 1/8 note - 1/32T timing, with latch - AudioCopy beats and sequences to compatible apps - AudioPaste samples from hundreds of compatible apps
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.
