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.
Curiously small paintings, in a paint tin that fits in your pocket.
$4.99
Evidence scope: #94 is the current overall US Paid chart position. 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 AltoPaint: Oil & Gouache: map the core Graphics & Design workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Curiously small paintings, in a paint tin that fits in your pocket. Open the lid and there's a tiny canvas inside, with twelve pigments and a mixing tray below. AltoPaint's paint behaves like paint: colors mix the way real pigments do, the brush runs dry, wet strokes drag into each other, and thick paint catches the light. THERE'S NO UNDO Just like real paint. Paint over it, scrape it back with the knife, or let it set and work on top. Nothing is ever ruined; it just becomes part of the painting. TWELVE REAL PIGMENTS Titanium white, lemon yellow, cadmium yellow, yellow ochre, cadmium red, quinacridone magenta, ultramarine blue, phthalo blue, viridian, burnt sienna, raw umber and Payne's grey. Colors are mixed from each pigment's real reflectance across the spectrum, not from RGB, so blue and yellow make a true green and tints come out clean. OIL OR GOUACHE Start each painting in oil on a warm toned canvas, glossy and slow to dry, or in gouache on white paper, matte and quick to set. THREE TOOLS The round brush for everyday marks, the flat for broad strokes with a chisel edge, and the palette knife for flat planes, scraping and smearing. Pinch to zoom in for finer marks. READY FOR APPLE PENCIL Pressure, tilt and azimuth all shape the stroke. Lay the Pencil over to scumble with the side of the brush, and double-tap to switch to the knife. A GALLERY IN THE TIN Every painting is saved as you go. Share your favorites as images. No account, no ads, no subscription. Pay once and it's yours. Made in New York by High Line Labs.
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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: Expensive subscription
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Missing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor performance
Validate with people who use this workflow before building.
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.