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
The Manetron
"The Manetron" is the vintage tape sampling keyboard App for iPhone/iPad/Apple Silicon Mac
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.8
4 ratings · Top 50%
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 included19 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 The Manetron: 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
Expand sound library with more unique sounds and effects.
Assumption to check: Limited sound options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize audio playback engine for smooth performance.
Assumption to check: Inconsistent audio playback quality
Validate with people who use this workflow before building.
Hypothesis 3
Implement guided onboarding for first-time users.
Assumption to check: Difficult navigation for new users
Validate with people who use this workflow before building.
Hypothesis 4
Add options to share tracks on social media platforms.
Assumption to check: Lack of social sharing features
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
"The Manetron" is the vintage tape sampling keyboard App for iPhone/iPad/Apple Silicon Mac. Genuine sound sampled from the most famous white body tape sampling keyboard model number of M400S (serial number 419 & 728) manufactured in the 70's. You can see an internal mechanism (tape running animation) and can enjoy with eyes and an ear. Feel the live experience the motor noise mechanical sounds were recorded. Features: - 6 preset sound including Flute, 3violins (Strings), Cello, 8-voice Choir, Brass, Bungalow Bill ( Intro sound of The Beatles song "The Continuing Story of Bungalow Bill") - 35Kyes of sampled sounds from the M400S serial number 419 & 728 manufactured in the 70's. - Core MIDI compatible - Core Audio compatible - 8 sec PCM full sampling sounds each Key - Scrollable Keyboard with switchable key width - No loop sounds (real performance feeling) - 6 instrument sounds can be set as the favorite position of A,B,C position on setting screen - A+B, B+C mix sounds position - Built-in Reverb & Delay effects - The sound of motor mechanical noise - Tape running animation - Pitch control - Original sounds source are recorded by 96KHz/24 bits - Compiled under the supervision of Ken Miyajima (Kinzoku-Yebis, Damian Hamada's Creatures, Romanesco)
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
Axios
Zustand
React Navigation
expo-av
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.
