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
Soft Drummer
Soft Drummer is a subtle session drummer in your pocket
$17.99 · In-app purchases
PRICE
$17.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
492 ratings · Top 15%
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 included18 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 Soft Drummer: 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 user-generated content for custom kits.
Assumption to check: Limited drum kit options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement sharing options for patterns.
Assumption to check: No social sharing features.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with basic features.
Assumption to check: High price point compared to similar apps.
Validate with people who use this workflow before building.
Hypothesis 4
Create onboarding tutorials and tips.
Assumption to check: Lack of tutorials for beginners.
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
Soft Drummer is a subtle session drummer in your pocket. Easy to use, it's far more than a drum machine cause it can improvise musically with pure acoustic drum sounds played with brushes, hot rods and hands, giving the warmest grooves for soft pop, ballads, jazz, latin ... New Audio - Midi Export feature. Get Multi-Track or Full Mix in seconds. Live Pads lets to play live sessions on the way with 8 assignable pads and buttons for fills, intro, end with midi controls. New 4 Board Mode to control Live Pads with any Midi Controller with just 4 buttons, like iRig Blueboard. Synchronize any app easily with Ableton Link. And now you can send generated drums by midi to any sound source, drum machine or synthesizers. - 50 multilayer sounds with 3 different hit types (ghost note, accented note and drag / open ) x 3 RoundRobin alternating samples. - Improved Jam algorithm. (iPad) - Round Robin alternating samples, combining 3 layer samples of each individual stroke to get authentic natural sound. - Random generators to get creative ideas instantly. - 4 Effects including Compressor/Gate, Equalizer, Delay and Reverb. - Song Mode. Extra fast tool to create rhythmic structures for your song in seconds. - Ableton Link Sync - Midi Sync - Control several parameters with midi Control Change and Program Change. - Midi Out - Sound Module ( Midi In ) --- MIDI CONTROLS --- Assignable Midi Controls. Default Controls : Play : G2 LivePads : C1 - G2 Fill + Play/Stop : A2 Fill : C2 Fill + Toggle Hats/Ride D2 Toggle Hats/Ride Db2 Fill with LivePad Change E2 Load Live Pad C3 Preview LivePad Db3 Next Live Pad D3 Select Live Pad Set Eb3 Tap Tempo Bb2 Crash Cymbal B2 Next Song Ab2 Previous Song Gb2 Jam CC 1 Intensity CC 2 Master Volume CC 7 Swing CC 11 Reverb Level CC 91 Bank CC 32 Rhythm CC 0 Soundset PC
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
zustand
expo-av
react-navigation
react-native-reanimated
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.
