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
NuSaw
NuSaw is a polyphonic SuperSaw synthesizer: the huge, detuned '90s dance sound, built for accuracy and tuned to fill the room.
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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 included16 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 NuSaw: 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 personalized recommendations based on listening habits.
Assumption to check: Poor music discovery features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Offer a more robust offline music management system.
Assumption to check: Limited offline playback options
Validate with people who use this workflow before building.
Hypothesis 3
Enable users to share playlists and tracks with friends.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Provide insights into user listening patterns and preferences.
Assumption to check: Lack of detailed analytics on listening habits
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
NuSaw is a polyphonic SuperSaw synthesizer: the huge, detuned '90s dance sound, built for accuracy and tuned to fill the room. At its heart is a stack of 3 to 25 detuned sawtooth oscillators with a sine sub, a resonant lowpass filter, and dual ADSR envelopes for amp and filter. On top sits a full effects chain: an accurately modeled chorus, a tempo-syncable stereo ping-pong delay, plate reverb, and drive. Motion is built in: three LFOs, a flexible modulation matrix, a sequenced gate, and an arpeggiator, so patches breathe, wobble, all on their own. • 50+ factory presets: leads, basses, stabs, pads, strings, arps, and keys • Authentically modeled SuperSaw engine with accurate drift and stereo spread • FX rack with authentic chorus + ping-pong delay + reverb + drive • 3 LFOs, mod matrix, sequenced gate, and arpeggiator • Resonant switchable filter, with slope control and key tracking • Save and share your own patches • AUv3 plug-in for AUM, Logic, GarageBand, Cubasis, and more, plus a full standalone app with an on-screen keyboard Whether you're chasing a festival trance lead, a snarling Reese bass, or a wide evolving pad, NuSaw gets you there fast. Not affiliated with or endorsed by Roland Corporation. Roland, JP-8000 and JP-8080 are trademarks of Roland Corporation, used for reference only.
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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
Zustand
axios
react-navigation
expo-av
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.
