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
AlchemDie - Alchemical Synth
AlchemDie is an alchemical synthesizer — spill the tonic into time, let it decay through the filter.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
11 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 included14 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 AlchemDie - Alchemical 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
Introduce more alchemical elements and sound effects.
Assumption to check: Limited sound customization options
Validate with people who use this workflow before building.
Hypothesis 2
Add a feature for users to share their sounds with others.
Assumption to check: No community sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a guided tutorial for first-time users.
Assumption to check: Potential steep learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 4
Enable sound creation and manipulation offline.
Assumption to check: Lack of offline capabilities
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
AlchemDie is an alchemical synthesizer — spill the tonic into time, let it decay through the filter. Inspired by the patch-and-pray spirit of experimental sound boxes, AlchemDie turns a single tonic oscillator into evolving drones, brittle lo-fi echoes and unpredictable textures. It is built to be played by touch and by chance: nudge a knob, trigger a gesture, and let the patch surprise you. — SOUND ENGINE — • TONIC oscillator with coarse, fine, interference and modulation depth • TIME delay with lo-fi BBD/PT2399 character and companding • DECAY, ABSORB and BLEND to sculpt the feedback path • FILTER with vactrol-style slew for organic, rubbery sweeps • ACTIVATION and AGITATION (LFO) for self-playing, generative movement • Stereo widening and output level — GESTURE PADS — Six one-touch gestures to instantly reshape the sound: CRUMBLE · SURGE · FREEZE · VOID · FLUTTER · BURN Tap to throw the patch into a new state — perfect for live performance and happy accidents. — MADE FOR iOS — • Standalone app and AUv3 plug-in • Runs inside GarageBand, AUM, Cubasis, Drambo and any AUv3 host • Pinch-to-zoom interface, optimised for iPad and iPhone in landscape • 25 factory presets to get started, plus your own savable patches • MIDI input: play the tonic pitch from your host or controller Whether you are scoring, sound-designing, or just chasing strange and beautiful noise, AlchemDie rewards curiosity. Less a synth to program, more an instrument to explore.
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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
react-navigation
expo-av
axios
react-native-reanimated
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.
