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.
VU303 is the successor to VU202, the pocket sampler downloaded by more than 19,000 people on iOS
$3.99
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.
Your first Build Kit is free with a verified email.
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.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
VU303 is the successor to VU202, the pocket sampler downloaded by more than 19,000 people on iOS. It is a phrase sampler and pattern sequencer built like the hardware samplers of the late '90s. Every key is labelled with what it does, every knob turns, and everything you need to make a beat sits on one panel – on your iPhone, on your iPad, or on stage. VU303 is AUv3 Effects Host but also works as AUv3 Instrument Plugin! COMING FROM VU202 • Your VU202 projects open and sound as they did: their pads keep the VU202 engine, and you can move any pad to the new VU303 engine • New in VU303: six views instead of one screen, a new sampling engine, patterns of up to 256 steps, a mixer with AUv3 inserts, LIVE XY effects and MIDI LEARN SAMPLE ANYTHING • Record from the microphone or an audio interface, resample the app's own output, or import audio files, whole folders and the sound of a video • Nine built-in vintage drumkits with 785 samples • Two engines per pad: the new VU303 engine (STANDARD 44.1 kHz, LONG 22.05 kHz, LO-FI 11.025 kHz) and the classic VU202 engine 32 PADS IN 4 BANKS • Gate or one-shot, loop, reverse, and stereo / mono / left / right per pad • Choke banks, pad copy, roll and hold • Three CTRL knobs for volume, pan and pitch – or for the selected effect TRIM, CHOP AND STRETCH • Start, end, level, attack and decay; truncate, normalize, reverse and silence • Chop a sample into 4, 8 or 16 slices across a bank • Loop points with crossfade • Time-stretch to the project tempo, with or without keeping the pitch STEP SEQUENCER AND SONG • 32 patterns of up to 256 steps (16 bars) • Velocity, pan, key, nudge and gate for every step • Live recording with quantize, swing from 50 to 75 %, count-in and tap tempo • Chain patterns with repeat counts into a full song MIXER AND EFFECTS • Channels for banks A–D, the pads and the master, with fader, mute, solo and meters • 26 DSP effects: filters, EQ, compressors, limiter, delay, tape delay, reverb, chorus, phaser, flanger, overdrive, distortion, lo-fi, vinyl sim, slicer, isolator, radio tuning and more • Insert slots on every bank and the master – including your AUv3 effect plug-ins LIVE FX • Eight XY pads on the master output, each with one of 16 performance effects such as tape stop, filter, beat repeat, grain scatter, vinyl warp and crusher • LATCH keeps an effect on after you lift your finger MIDI • Play the pads from any MIDI keyboard or pad controller • MIDI LEARN: map knobs, keys, pads, faders, XY pads and TRIM markers to your controller, and save and share the mappings as templates • MIDI channel filter and velocity curves EXPORT AND PROJECTS • Render a pattern or the whole song as a 24-bit WAV mix or as stems • Autosave; projects are saved as .vu303 files • Send projects to VU Studio MADE FOR TOUCH • Layouts for iPhone and iPad, in portrait and landscape • Adjustable text sizes and hold-to-magnify for every label
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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.
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.
Not assessed in a Build Kit yet.
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.