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
HALion Sonic Play: Workstation
Your go-to workstation instrument app for iPhone, iPad, and every AUv3-compatible mobile DAW
$19.99 · In-app purchases
PRICE
$19.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
67 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 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 HALion Sonic Play: Workstation: 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
Enhance the library with more diverse instruments and sound packs.
Assumption to check: Limited variety of virtual instruments compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the UI with a guided onboarding process.
Assumption to check: User interface might be overwhelming for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Introduce real-time collaboration tools for users to work together.
Assumption to check: Lack of collaboration features for users
Validate with people who use this workflow before building.
Hypothesis 4
Add tutorials and contextual help to assist users in learning the app.
Assumption to check: No built-in tutorials or help sections
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
Your go-to workstation instrument app for iPhone, iPad, and every AUv3-compatible mobile DAW HALion Sonic Play for iPhone and iPad brings the spirit of a full-blown workstation to your mobile setup; packed with more than 2,000 exceptional instrument sounds spanning every genre. From modern synths and punchy basses to expressive keys, pads, leads, and beyond, HALion Sonic Play is built to help you create finished, professional tracks fast — wherever inspiration hits. Whether you’re sketching ideas on the couch, building beats on the train, or polishing a full arrangement in the studio, HALion Sonic Play fits right in. Use it standalone for instant playability, or run it inside Cubasis and any AUv3-compatible DAW on iPhone and iPad for a seamless production workflow. - Your workstation instrument for iPhone, iPad, and every AUv3-compatible mobile DAW - More than 2,000 inspiring instrument sounds — ready for every genre - Quick Controls to shape and tweak sounds in seconds — no deep diving - Arpeggiator for instant motion, rhythm, and modern patterns - Quick ADSR controls for precise, musical envelope control - Works standalone or inside Cubasis and any AUv3-compatible DAW on iPhone and iPad Your sound, always within reach HALion Sonic Play is designed for speed, creativity, and great sound from the very first tap. Open the app and you’re immediately surrounded by a huge range of playable instruments, which can take you from a simple idea to a fully produced track in no time. Need movement? The arpeggiator brings instant energy and groove. Want to shape a sound quickly? Quick Controls and the ADSR page let you dial in punch, softness, brightness, or bite in seconds — so you stay in the flow. Whether you’re writing hooks, building chords, crafting textures, or laying down a full arrangement, HALion Sonic Play keeps things simple, musical, and fast, with all the depth you need for when you want to go further. Take your sound anywhere, start ideas instantly, and turn inspiration into standout tracks on iPhone and iPad. Technical support https://forums.steinberg.net If you like HALion Sonic Play, please support us by rating this app in the App Store! Thank you!
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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.
