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.
KingB is designed to capture the unique tones of the B and C series tonewheel organs
$9.99 · 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.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
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 KingB Organ: 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: Limited instrument selection compared to desktop software.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High latency in sound playback.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult for beginners to navigate features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be confusing.
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.
KingB is designed to capture the unique tones of the B and C series tonewheel organs. It uses a fresh modeling approach to generate tonewheel signals in real time, as well as to replicate the complex interplay of components that make the organ “sing”. Absolutely no samples are used. The interplay within the intricate network of tonewheels, components, wiring harnesses, and motor elements is synthesized to a convenient set of parameters. By using them, you are able to change the quirks of the underlying organ model. This helps parallel the variances heard among individual examples of the physical instrument, and even allows replicating the effects of aging or out-of-spec electronics. The new rotary speaker emulations are a deep dive into the 3D aural candy that makes tonewheel organs truly shine. Six unique cabinet models are complemented by four amps that provide extra warmth via our “Virtual Tube” technology. An additional guitar amp bus (with three models to choose from) runs parallel to the rotary for even more sound options. A set of carefully selected pre- and post-amplification effects are integrated for good measure (and may all the measures you play be good!) Three manuals, each with its own drawbar set, as well as over 130 organ and FX parameters are MIDI controllable. You can save and share MIDI maps, sound presets, and in-app audio recordings. Factory presets include over 110 sounds varying from laid back Jazz ditties to gnarly, Purple-colored distortion extravaganzas. KingB is ready to join your workflow as an AUv3. Both the app and the plugin are universal, and also support Apple Silicon Chip computers. :: Organ :: • 91/96 Virtual Tonewheels, including 12 complex wheels • 3 manuals with own drawbar sets • Scanner chorus/vibrato • Carefully recreated “Swell” (or “Expression”) pedal • Percussion with additional user-defined parameters • Variable modeling characteristics, including tonewheel interplay, component state and more. • 12 silent-switching drawbar presets on Swell and Great manuals, MIDI controllable • Optional lower foldback • Optional keyclick with adjustable parameters • Options to emulate M and T series organs as well as B and C ones. :: Rotary & Amps :: • Six rotary cabinets with different tonal and modulation characteristics • Adjustable fast and slow speeds for both horn & drum • Adjustable acceleration and deceleration • Adjustable mic angle, distance, and balance • Adjustable stereo panning parameters for both horn & drum • Four rotary amp types, as well as bypass • DI with panning • Parallel guitar amp with three models to choose from :: FX :: • Pre-Amp FX include, — Distortion/Overdrive with EQ & Mid Boost — 10-band graphic EQ — Wah with optional auto — Chorus/flanger with variable rate & depth — Tape delay emulation with self-oscillating feedback — Spring reverb • Post-Amp FX include, — Compressor with threshold, ratio, attack, and decay. — 15-band graphic EQ — Parametric reverb with 7 room types, pre, decay, and tone. :: Admin Stuff :: • Also runs as AUv3 • DAW-friendly fluid layout • Fully configurable MIDI key split, even allowing overlays • Easy MIDI learn, with ability to manually configure each MIDI parameter • 130+ MIDI parameters • MIDI map save, share, preset linkage • Velocity control for keyclick, amplitude, and percussion • Lockout mode for organ modeling settings & MIDI prefs • Create, save, and share unlimited banks and presets • 110+ factory presets • Stand alone app: audio recording & sharing • Compatible with Apple Silicon computers
Written user reviews are not shown here. Check current App Store reviews >
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.