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
Choppa
WaveLoop Choppa is a lightning-fast sampler and slicing instrument built for songwriters, live loopers, and sonic sketchers
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
3 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/
Preview a sample Build Kit No email needed
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 Choppa: 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
Focus on unique features or niche genres to attract users.
Assumption to check: Limited music selection compared to established services
Validate with people who use this workflow before building.
Hypothesis 2
Invest in user experience design to create a visually appealing app.
Assumption to check: User interface may lack polish
Validate with people who use this workflow before building.
Hypothesis 3
Implement thorough testing and user feedback loops to enhance reliability.
Assumption to check: Potential for bugs during playback
Validate with people who use this workflow before building.
Hypothesis 4
Offer flexible plans and unique content to retain users.
Assumption to check: High churn rate due to subscription fatigue
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
WaveLoop Choppa is a lightning-fast sampler and slicing instrument built for songwriters, live loopers, and sonic sketchers. Stop clicking notes into a piano roll and start performing your ideas. Whether you are capturing a quick vocal chop through your microphone or slicing up a synth loop inside your favorite mobile DAW, Choppa turns static audio into a playable, dynamic instrument instantly. ESCAPE THE GRID Designed for speed and musicality, Choppa lets you bounce loops into slices, trigger sections as one-shots, and remix ideas into fresh patterns without slowing down your creative flow. STANDALONE & AUV3 PLUGIN Use Choppa as a standalone instrument to jam and sketch ideas on the go using your device's microphone. When it's time to produce a full track, load Choppa as an AUv3 plugin inside GarageBand, Logic Pro for iPad, AUM, or any compatible host to integrate it directly into your mix. KEY FEATURES • Instant Chopping: Record audio and immediately map it across playable trigger pads. • Perform Your Loops: Trigger sections organically as one-shots to create new rhythms and call-and-response patterns. • Destructive Fun: Reverse, choke, and manipulate slices to discover happy accidents. • AUv3 Support: Full Audio Unit v3 support for seamless integration into iOS DAWs. • Export Anywhere: Part of the WaveLoop ecosystem—export your ideas and build them out in your desktop DAW. Catch the vibe, mangle your loops, and build your next track with WaveLoop Choppa.
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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.
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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.
