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.
Turn your iPhone into a precision barometer.
$1.99
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.
Rork plan preview for Zambretti Barometer: map the core Weather 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 user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No historical data analysis
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No 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.
Turn your iPhone into a precision barometer. Your iPhone has a real barometric pressure sensor built in. Barometer puts it to work. See live sea-level pressure, watch the 3-hour trend, and get an early heads-up before the weather turns. Everything reads at a glance - on your Home Screen, your Lock Screen, and now your wrist. A live pressure gauge A beautiful, crafted dial shows your current mean sea-level pressure with a live 3-hour trend - rising, falling, or steady - plus clear 6-hour and 24-hour reference markers so you can see exactly where things are heading. History at a glance. Scroll back through 24 and 48 hours of pressure on a clean chart, so a passing front or a building high is obvious. Storm & clearing alerts • Barometer-derived alerts read your pressure and its trend to call storms early and tell you when it's clearing • Delivered as on-screen banners and optional background notifications, so you're warned even when the app is closed A classic barometer forecast. The time-honoured Zambretti method turns your pressure, trend, and wind into a plain-language forecast - computed from your own barometer, correct for both hemispheres. Feel the weather before you see it Many people sense pressure changes in their body before the sky shows a thing: headaches, migraines, sinus pressure, aching joints. Barometer helps you connect the two. • An optional wellbeing log records how you feel and stamps each entry with the real pressure you were experiencing - the actual air around you, not just the sea-level number • A summary builds as you log, showing what the pressure was doing when you felt off - falling, steady, or rising, low or high • Look back over time to spot your own patterns • Private to you, kept on your device, never shared Your sensor vs. Apple Weather Barometer pulls in Apple Weather for temperature, wind, and the official sea-level pressure, then shows your iPhone's own sensor reading side by side - so you see your exact local conditions, not just the nearest station. Built-in widgets • Live pressure on your Home or Lock Screen • The 3-hour trend, a 24-hour chart, and any active storm alert • One glance away, no need to open the app On your wrist • An Apple Watch app with your live pressure, trend, and 24-hour chart • A watch-face complication so the current reading is always one glance away • Stays fresh on its own with Apple Weather, even when your phone is out of reach Made yours • Eight hand-crafted colour themes, with System, Light, and Dark appearance • Your choice of pressure, temperature, wind, and elevation units • A recording log of every reading, with one-tap CSV export Extra tools • Density altitude for shooting and ballistics, in feet or metres Private by design. No account, no sign-up, no tracking. Your readings stay on your device. Barometer is built for iPhone - that's where the sensor lives. An Apple Watch app and complication keeps your latest reading a glance away on your wrist.
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.
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.