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.
From quick sketches to fully finished artwork, Sketchbook goes where your creativity takes you.
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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.
Rork plan preview for Sketchbook®: 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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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: Lack of advanced brush settings compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited export options for artwork.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No collaboration features for shared projects.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulty in organizing artwork in the gallery.
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.
From quick sketches to fully finished artwork, Sketchbook goes where your creativity takes you. Sketchbook is an award-winning sketching, painting, and drawing app for anyone who loves to draw. Artists and illustrators love Sketchbook for its professional-grade feature set and highly customizable tools. Everyone loves Sketchbook for its elegant interface and natural drawing experience, free of distractions so you can focus on capturing and expressing your ideas. • A full complement of brush types: pencils markers, airbrushes, smear and more that look and feel just like their physical counterparts • Brushes are highly customizable so you can create just the look you want • Guides, rulers and stroke tools support precision when you need it • Layers with a full complement of blend modes deliver the flexibility to build up and explore drawings and color • Purpose-built for sketching, the interface is clean and unobtrusive so you can focus on drawing Purchase the Premium Bundle to unlock more... • Import and export brushes • Create your own custom brushes • Resize your canvas or image • Set canvas resolution in px/inch or px/cm • Clipping masks • Additional layer adjustments including blur, sharpen, brightness/contrast, greyscale, and invert • Additional color harmonies • Additional custom gradients • Select color from reference images • Extract color palettes from images • Import and export color palettes • Layer grouping • Layer masking Blend Modes • Draw Outline tool • Lasso Fill tool • Export to PDF • plus more to come!
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.
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.