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
Echo Beach
Sample anything
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
4 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.
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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 Echo Beach: 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
Implement robust offline playlists and caching.
Assumption to check: Limited offline capabilities
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing options for playlists and tracks.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement AI-driven music recommendations based on listening history.
Assumption to check: Lack of personalized recommendations
Validate with people who use this workflow before building.
Hypothesis 4
Enable background audio playback for uninterrupted listening.
Assumption to check: No background playback support
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
Sample anything. Sequence anything. Ship to any DAW. Echo Beach turns your iPhone into an SP-1200 style sampler with modern workflow. Capture, chop, sequence and export in seconds. CORE FEATURES - 8-Pad Sampler: Load, trim, loop, and play like classic MPCs - Smart Slice Detection: Auto-chop or edit transients manually - Built-In Step Sequencer: Program beats and rhythms instantly - Groove Engine interpolates between 8 templates from quantized to Dilla-esque swing - Studio FX: Reverse, EQ, Transient Shaper, 5 Distortion models, Stutter, Tone Filter, Chorus, Widener, Delay and Reverb - Factory Sounds Bank (B): Professional samples included to start immediately - Voice Note Ready: Record directly or import your sounds - DAW Export: Send stems, full mix and/or MIDI with full BPM + time-signature metadata - BPM Auto-Detection - Pad 1 sets the BPM to its adjustable loop length - Low Latency playback - MIDI controller support with MIDI Map mode to customize to your controller - Export the session and share with your bandmates / producers / collaborators WORKFLOW Record → Slice → Sequence → Export - Import or record anything: voice notes, vinyl, field recordings - Tap the waveform or auto-slice to cut up your audio - Drag and drop slices to any pad - Sequence your pattern and add FX - Export stems + MIDI to Ableton/Logic/Pro Tools WHY ECHO BEACH Most samplers make you choose: simple or powerful. Echo Beach is both. Echo Beach breaks this trade-off with intelligent features that work like you think: - Reversed samples auto-remap to maintain musical timing - Slices become MIDI notes automatically - Groove applies musically, not mechanically - Everything happens in real-time with near-zero latency Perfect for - Beat makers capturing inspiration anywhere - Producers sketching before studio sessions - Musicians capturing song ideas on the go - Sound designers building sound libraries - Anyone who thinks, "What if I could sample that?” Stop scrolling YouTube for 'how to make beats.' Start making them. TECH SPECS - Supports WAV, AIFF, MP3, M4A, CAF - Export stems, full mix, and MIDI - 20-30 ms latency on modern iPhones - Fully offline operation Tap the logo to access the manual. Includes a search bar for quick reference. COMING SOON - AUv3 plugin integration for GarageBand, Logic Pro, Ableton, AUM and Cubase
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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.
