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.
Vulcana shows the living Mediterranean: earthquakes, volcanoes, wind and storms on one live map, and turns them into music.
$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.
Vulcana shows the living Mediterranean: earthquakes, volcanoes, wind and storms on one live map, and turns them into music. Made for anyone who lives on, or travels to, the edge of an active volcano: Sicily, the Aeolian islands, Naples, Greece and the whole Mediterranean. LIVE QUAKE MAP Every earthquake reported by INGV, EMSC and USGS appears on the map as soon as it is published, coloured by magnitude. For a recent quake, rings show how far it could have been felt. Filter by time, magnitude and distance, or browse them all in a list. FIVE VOLCANOES, WATCHED Etna, Stromboli, Vulcano, Campi Flegrei and Vesuvio each have a ring that shows their seismic unrest compared with the past month. For Etna and Stromboli you also see the official aviation colour code issued by INGV, with the observers' own notice: what they see, the ash cloud, and when it was issued. WHERE THE ASH GOES When the official code is Orange or Red, an ash cone points where the summit wind would carry it, towards Catania, Reggio Calabria or Naples. AIRPORT WEATHER Catania, Comiso, Palermo, Trapani, Reggio Calabria and Naples, each coloured by its weather report: thunderstorm, low visibility, volcanic ash. Turn on alerts and your phone tells you when the weather changes at the airport that matters to you. WIND AND STORMS Drifting streaks show the wind over the island, and a purple glow marks thunderstorms before they reach you. RADIO OF SICILY A piece of music that never repeats, played live by the forces around you. The wind strums an Aeolian harp. The heat wakes the cicadas, the evening wakes the crickets, and they call and answer each other. Birds sing at sunrise. Storms roll in as thunder. The volcano you listen to has its own voice: Etna's deep drone, Stromboli's bursts and sparks, the steam of Vulcano, the slow breath of Campi Flegrei. Climb a mountain and the sea fades as the air thins and a shimmer of bells appears. Drive and the harmony quickens. It keeps playing with the screen off. LEARN WHY IT SOUNDS Every sound comes from real data, and the app shows you which: tap a layer to hear it alone and read what moves it. Or try Scenarios to hear a storm, an eruption or a quiet August night. GUESS THE MAGNITUDE Felt a tremor? For an hour Vulcana hides the magnitude of a quake near you. Guess it, see how close you were, build streaks and climb from Novice to Master Seismologist. SPEED AND ALTITUDE A speedometer and altimeter on the map and in the radio, with a button that keeps the screen on for a phone in a car holder. PRIVATE BY DESIGN No account, no ads, no tracking. Your precise location, speed and altitude never leave your iPhone. Only an area about 11 km across is used to look up the weather. Please note: Vulcana is not an official warning system. It shows public scientific data as it is published, sometimes minutes late or later revised. For your safety, follow Civil Protection and INGV. Airport colours describe the weather, not whether flights operate. Data: INGV, EMSC, USGS, MET Norway and NOAA. Maps © Mapbox © OpenStreetMap contributors. Made by SIA SPACE, an audiovisual studio.
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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.