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.
DynaSynth Dynamic Shape Synthesizer (AUv3)
$2.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for DynaSynth: 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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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
Assumption to check: Users may find the sound selection limited
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: User interface can be overwhelming for beginners
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Background audio playback can drain battery
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Not enough effects options for advanced users
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
DynaSynth Dynamic Shape Synthesizer (AUv3) DynaSynth is a virtual instrument plugin that can run standalone, or in any AU compatible host such as Logic Pro or GarageBand. Please note that the standalone version does not include a built-in keyboard - you need to connect a suitable MIDI device to play the synth. Overview DynaSynth is an original design based on variable shaped dual analog-flavoured oscillators for each of its 8 voices, that uses its own output to modulate parameters dynamically. This can produce interesting sonic results that would be very difficult, if not impossible to achieve using traditional fixed LFOs and envelopes. That's because: As the sound changes, so does the modulation amount, which changes the sound, which affects the modulation amount... Dynamic / Modulation & Display At the top of the UI is a realtime display of "dynamics", wave shapes and all the modulation being applied. The (D) dynamics indicator is essentially an envelope follower with variable damping that is used as a modulation source for the oscillator shapes (1/2), vibrato (v) and filter (f) cutoff. MIDI Implementation DynaSynth is an 8 voice polyphonic velocity-sensitive MIDI instrument and is playable over a keyboard range from A0 (21) to C7 (96) on any MIDI channel. DynaSynth also responds to mod wheel, expression (CC#11), sustain (CC#64), channel aftertouch, all notes off (CC#123) and pitch-bend. DynaSynth vs. DynaSinth While they can be confusing, the names are very similar on purpose, representing a shared design theme, i.e. a synth that is dynamic. The DynaSynth design actually came first, and it is based on fairly traditional analog-flavoured oscillators. DynaSinth shares the same dynamics engine but with a modified set of parameters designed to complement the sound of its sine wave oscillators. While I like to think both synths have their own character, and can sound fairly unique, DynaSynth is probably more capable of producing familiar analog synth tones, and DynaSinth lends itself more to keys and pads. Both synths are also good for those who like to experiment with "out there" / "Sci-Fi" type sounds, and DynaSynth is probably better suited for that sort of thing. For more info and support please visit: www.waverley-instruments.com/robjackson
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.