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.
*** IMPORTANT! Koala FX is an Audio Unit Effect plugin (AUv3) which requires a compatible host or DAW to work such as Garageband, Beat Maker 3, AUM etc ***
$3.99 · 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 Koala 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: Users find it difficult to navigate between effects and recordings.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited offline access features.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users experience performance issues on older devices.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of customization options for effects.
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.
*** IMPORTANT! Koala FX is an Audio Unit Effect plugin (AUv3) which requires a compatible host or DAW to work such as Garageband, Beat Maker 3, AUM etc *** *** Koala FX is the ultimate creative effects unit. It offers 16 one-touch effects that you can play intuitively like an instrument, allowing you to effortlessly morph and twist your track into something beautiful. It includes all your favourite mix effects from Koala Sampler, but refined and souped up to allow super smooth cuts and crossfades. Apply effects to your whole mix just to add some lofi warmth or to liven things up… or use it to sculpt synth sounds to blend in with the rest. * Save up to 8 scenes per preset, so you can cut between them in time with the music * Smoothly crossfade between scenes with a giant 8-way X-Y pad. * Rearrange the order of the effects by dragging them. * A togglable hold mode allows you to keep some effects engaged, and others off when you let go of them. * Fully automatable via your host (effects, volume, scene, XY pad) * UI is fully resizable, works great in any aspect ratio CRUSH Bitcrusher with transistor distortion PITCH Frequency domain pitch shifter COMB Super short smooth interpolating delay with gallons of feedback RING Modeled diode ring modulator REVERB Efficient schroeder topology reverb STUTTER Loops a fragment of sound coming into koala fx and loops it in time with the music GATE Noise gate with hysteresis FILTER Combined low and high pass analog modeled filter CUTTER Chops the signal to the beat REVERSE Delay effect that reverses parts of your sound in time to the music DUB Vari-speed analog style tape delay TEMPO DELAY Tempo synced delay TALKBOX Formant filter based on human vocal tract VIBROFLANGE Half-vibrato, half-flanger DIRTY Analog modeled valve distortion COMPRESSOR Hard knee opto-style compressor with a bit of If you’re having any issues with Koala FX please get in touch at https://www.elf-audio.com/contact.php
Written user reviews are not shown here. Check current App Store reviews >
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.