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
Synth Bass Pro
synth bass pro is the premier synth bass app to give you the best sounding low end without the string noise of a standard bass guitar and infinite loop possibilities.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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.
JavaScript is required to complete mailbox verification.
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 Synth Bass Pro: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Offer more advanced synthesizer settings and parameters.
Assumption to check: Limited sound customization options
Validate with people who use this workflow before building.
Hypothesis 2
Implement an onboarding tutorial to guide new users.
Assumption to check: Lack of user tutorials or help
Validate with people who use this workflow before building.
Hypothesis 3
Clearly explain the value of each sound pack within the app.
Assumption to check: In-app purchases for sound packs may confuse users
Validate with people who use this workflow before building.
Hypothesis 4
Redesign UI with modern aesthetics and user-friendly components.
Assumption to check: Basic user interface may feel dated
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
synth bass pro is the premier synth bass app to give you the best sounding low end without the string noise of a standard bass guitar and infinite loop possibilities. containing three iconic synth bass sounds, you are sure to have exactly what you need for many genres of music. synth bass pro is loaded with an 808 "drop" note as well for builds, bridges, and bass drops. designed to be one size fits all, sbp is preset with three iconic synth bass sounds, rather than customizable settings: - brown (soft, gentile) - blue (extra wide, deep, and mid-rangy) - green (some grit, yet smooth) how i use synth bass pro: i love using synth bass in substitution of a standard bass guitar during certain parts of a song that are lower in volume or dynamics. if a song has a build that goes into a lower chorus, this is what i would use to continue the "emotion" of the song during that chorus, while maintaining the soft chorus feel. additionally, i love the 808 bass drop feature. typically i use this feature at the end of a big bridge build and into a big chorus. in my genre, worship music, i feel it adds an extra sonic layer that i absolutely love. i recommend using this app with proper sound equipment that can handle lower frequencies and it will sound even better when connected to something that has a subwoofer. i hope you enjoy it!
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Supabase
Zustand
react-navigation
expo-av
BUILD KIT DIFFICULTY
Intermediate
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.
