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
King of Bass: Synth + 808 Sub
YOU'RE going to be the KING OF BASS!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
225 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 included18 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 King of Bass: Synth + 808 Sub: 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
Provide more customizable and shareable preset features.
Assumption to check: Limited preset saving options
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to preview effects before applying.
Assumption to check: No audio effects preview
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the interface for new users, possibly with tutorials.
Assumption to check: Complex UI for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Offer clearer descriptions of in-app purchases and benefits.
Assumption to check: Limited in-app purchase clarity
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
YOU'RE going to be the KING OF BASS! ++ This app used in Hit Songs! Take your BASS to the next level with this app! ++ Add warm analog magic or create the Perfect 808, or Sub to FATTEN your sound, This app will make your music more POWERFUL! It’s more than bass, with the KICK IT! button you can Easily make perfectly tuned, original custom kicks with the custom kick maker. Get Better Bass in one easy step… Download this app! ++ Over 400+ Presets to inspire you, including 120+ "Starter" sounds to make your own sound! ++ BOOM BASS Sound! Works on any style of music, you're gonna find a bass in here that's gonna inspire you for some songs. This is NOT another generic boring sounding synth– This is SPECIAL - It will VIBE your speakers and SHAKE your seats. Stupidly easy-to-use: it’s possible to create over 6,000+ different combinations of bass layers. That’s just the start… Want to make a massive, original kick drum? IN KEY WITH YOUR SONG? HECK YEAH, YOU WILL! These sounds are so inspiring, I want to make a song out of almost every bass sound Check out the Tutorials & Overview Videos: https://audiokitpro.com/kingbass A Few of the Features: + 2000+ samples and custom waveforms from a platinum producer + Step Sequencer with “Magic Gate”, variable divisions, multiple oscillator & layer destinations + Traditional Synth Engine (including Pulse Width Modulation) + 2 LFOs: Multiple waveforms + Re-trigger + modulate other LFOs by LFO + Almost all parameters can be LFO Destinations–Morph Sounds, Wobble ‘em, Pitch Dive, Crush them perfectly with a keypress + New Bass Distortion and chain w/ Bass Boost! + 2 Layers instead of just one + Brand NEW Filter made for LOW END + Full ADSR (Attack, Decay, Sustain, Release for each layer) + On board RECORDING – easily make kicks, baselines and more without any other gear or apps + Kick it! Function to turn any patch into a custom kick... Sure, it has lots of features! But, I think the best thing about this is the SOUND. This is the BASS you've been looking for. Videos and more: https://audiokitpro.com/kingbass WARM UP YOUR TRACKS with real analog sounds. Earthshaking. Jaw-dropping.... GO MAKE YOUR BASS!
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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.
