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.
Nocturne LoFi is an immersive generative music studio for focus, rest, reading, and late-night creativity.
$0.99
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.
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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.
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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.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Nocturne LoFi is an immersive generative music studio for focus, rest, reading, and late-night creativity. Choose a rainy desk, midnight café, moving night train, forest cabin, VHS memory, space radio, or harbor at dawn. Every scene combines a distinct rhythm, melody, and environmental texture. Whether you are studying, working, relaxing, or preparing to sleep, shape a sound space that feels personal. Swipe to explore scenes. Touch and hold a card to arrange them your way. 【GENERATED, NOT SIMPLY REPEATED】 Nocturne LoFi generates and mixes music in real time from your selected scene, mood, and controls instead of relying on one short repeating track. Shape the sound with controls for: • Mood and musical direction • BPM and rhythmic pace • Tone and warmth • Space and reverb • Motion and variation • Stereo width • Ambience and scene texture Regenerate whenever you want a new variation that remains familiar without sounding exactly the same. 【IMMERSIVE WORLDS WITH DISTINCT IDENTITIES】 Every scene has its own musical structure and atmosphere: • Rainy Desk — detailed rainfall and a quiet workspace • Late Night Study — restrained rhythms for sustained concentration • Midnight Café — warm, relaxed urban grooves • VHS Memory — vintage drift and worn-tape character • Night Train — steady motion inspired by passing rails • Sunday Morning — light and unhurried rhythms • Forest Cabin — natural ambience in a warm wooden space • Space Radio — wide, floating electronic textures • Harbor Dawn — calm layers that gradually come to life Immersive Mode brings artwork, animation, playback, timers, and audio sharing together in layouts designed for portrait and landscape use. 【FOCUS TIMER AND SLEEP FADE】 Choose a timer that fits the moment: • 25-minute focus session • 45-minute deep-work session • 60-minute sleep mode The timer continues while audio plays in the background and automatically pauses playback when it ends. Sleep mode gradually lowers the volume during its final stage for a gentler finish. 【BACKGROUND PLAYBACK AND SYSTEM CONTROLS】 Keep listening when your device is locked or while using another app. Control playback from the Lock Screen, Control Center, headphones, and Now Playing. Supported iPhone models also show playback and timer status in Dynamic Island. A Home Screen widget keeps your current scene and BPM visible at a glance. 【SAVE AND SYNC】 Save combinations of scenes, moods, and mix settings as favorites, then restore them without rebuilding the sound from scratch. With iCloud, favorites, scene order, and key preferences stay in sync across your devices. 【EXPORT AND SHARE AUDIO】 Render the current scene offline as a stereo M4A file. Choose 5 seconds to 3 minutes, then save or share it. Export is available from Settings and Immersive Mode. 【AN AUv3 INSTRUMENT FOR MUSIC CREATORS】 Nocturne LoFi also includes an AUv3 instrument extension for compatible hosts such as GarageBand. The AUv3 instrument supports: • MIDI keyboard performance • Host tempo and timeline synchronization • A variable-length step sequencer • Swing, ties, and per-step velocity • Triplet rates • Tone, space, drift, and scene controls • Host project state saving and restoration The main app can also manage compatible AUv3 effects installed on your device, giving you more ways to shape your sound chain. 【ONE PURCHASE, COMPLETE EXPERIENCE】 Nocturne LoFi is a one-time purchase with no subscription. One purchase unlocks every scene, music generation, Immersive Mode, timers, audio export, iCloud sync, and the AUv3 instrument. Put on your headphones and choose a scene. Let the night, the rhythm, and the surrounding ambience make room for time that feels entirely your own.
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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.