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.
RetroLab is an AUv3 vintage effects processor that blends the character of classic hardware with the flexibility of modern sound design
$6.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for RetroLab - Vintage FX: 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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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
Assumption to check: Limited effects compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Not user-friendly for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
RetroLab is an AUv3 vintage effects processor that blends the character of classic hardware with the flexibility of modern sound design. Inspired by gramophones, tape decks, and worn analog circuits, RetroLab lets you recreate the warmth, instability, and imperfections of vintage recording. From subtle coloration to full sonic destruction, RetroLab is built for experimentation. Shape your sound with a collection of 18 creative modules designed to add movement, texture, and character to any source. Whether you’re adding gentle tape warmth or diving into chaotic modulation, RetroLab gives you complete control over your signal—turning clean audio into something alive, imperfect, and uniquely yours. Modules include: NOISE: Adds authentic analog-style noise, from subtle hiss and hum to heavy vinyl crackle, bringing realism and depth to your signal. GLITCH: Introduces rhythmic interruptions, stutters, and digital instability for unpredictable, broken textures. WOW & FLUTTER: Emulates the pitch instability of aging tape machines, adding movement, drift, and organic modulation. PHASER: A classic modulation effect that adds sweeping, phase-shifted motion—from subtle shimmer to deep, swirling tones. DISTORT (Overdrive / Distortion): From gentle saturation to aggressive distortion, add harmonic richness and grit to your sound. TAPE TRANSPORT: Simulates the mechanical behavior of tape systems–speed changes, slow-downs, dropouts, and transport-style artifacts CRUSHER: Degrades your signal for lo-fi digital character, from vintage sampler tones to harsh digital artifacts. FILTER MORPH: A characterful, vintage-inspired filter that shapes and sculpts your sound with smooth, musical response. From subtle tonal balance to resonant sweeps and driven coloration, it brings the movement and warmth of classic analog circuitry into RetroLab. AIR DELAY: A spatial delay effect that adds depth and atmosphere. ATMOSPHERE: Generates ambient reverberating textures and tonal layers that enhance mood and create immersive sonic environments. TAPE TRANSPORT: Simulates the mechanical behaviour of tape systems, speed changes, slow-downs, dropouts. GATE: Shapes dynamics and rhythm by cutting or sculpting the signal, from tight control to creative gating effects. RESONATOR: A musically-aware feedback resonator that turns any audio into a playable, evolving harmonic instrument. CLOUDSEED: CloudSeed is a dense, modulated algorithmic reverb based on the CloudSeed engine. RetroLab Features * Low CPU Performance – Run all 12 modules simultaneously with full modulation. * Visual Feedback – Instantly see how each module is shaping your sound with responsive, real-time visualisation. * Deep Modulation – Most parameters can be modulated, allowing you to create evolving, expressive sound transformations. * Multiple LFOs – Three independent LFOs with adjustable speed, shape, and depth. * Creative Signal Routing – Combine modules in flexible ways to build anything from subtle warmth to extreme audio destruction. * Tempo-Synced Effects – Time-based modules lock to your host tempo for tight, musical results. * Precision + Chaos – Dial in controlled, musical processing or push into unpredictable, experimental territory. * Macro Knobs – Each module features a dedicated Macro knob for quickly dialing in the amount of effect. * Intensity Control – A single master control blends between dry and fully processed signal. * Macro-Level Workflow – Shape complex multi-effect chains with simple, intuitive controls, perfect for both quick tweaks and deep sound design. * Global Tone Shaping – Refine your sound with built-in high-pass and low-pass filters, tone control, and stereo width adjustment. * Stereo Control – Adjust the width of your signal, from focused mono to wide, immersive stereo textures. * Mix-Ready Output – Easily balance, shape, and place your sound without leaving the plugin. * Restoration - Hiss and Hum removal tools.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.