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.
Brushes 4 is the latest iteration of the app that started the iPhone and iPad painting revolution
$3.99 · In-app purchases
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 Brushes: 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: Limited brush options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Performance issues with large canvases
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of advanced features like layers
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent saving/loading experience
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.
Brushes 4 is the latest iteration of the app that started the iPhone and iPad painting revolution. Redesigned with a clean and modern user interface, Brushes supports iPhone and iPad with optimisation for the iPhone X, iPhone XS, iPhone Pro and iPad with Apple Pencil. • Highlights: - Clean and modern user interface with light and dark modes. - Files based painting gallery. - New canvas interface. - Apple Pencil support with pressure curve. – Unlimited undo and redo. - Continuous auto-save. - Cloud Drive import and export. • Parameterized Brushes: - Selection of ready to use brushes with customisable settings. - Create your own custom brushes from millions of permutations. - Generate random brushes for inspiration. - Dynamic adjustment of brush size and opacity. • Layers: - Layer your artwork for greater control. – Lock and hide layers. – Use alpha lock to only paint where pixels already exist. – Adjust individual layer opacity. – Duplicate, rearrange and merge layers. – Apply layer blending modes: normal, multiply, screen, exclude. - Color fill any layer. – Invert layer color and desaturate. – Flip and arbitrarily transform layers. – Adjust the color balance per layer. – Adjust layer hue, saturation and brightness. • Colors: - Colour picker with hue ring and saturation square. - Store and recall your favourite colors in swatches. - Sample painting colors with the eyedropper tool. • Apple Pencil: - Intuitive and powerful pressure curve to match your style. - Configurable realtime pressure based adjustment of brush size and opacity. • Creation: - Preset canvas sizes for paper, photographs, iPhone and iPad screens, film and television displays. - Custom canvas size. • Import, export and sharing: - Import images directly from your camera roll. - Import PNG and JPEG images from cloud services. - Export your paintings for sharing or importing into other apps as PNG and JPEG to all cloud storage services or as photos directly to your camera roll. - Compatible with paintings created by Brushes 3 and Brushes Redux. • Light and dark appearances: - Choose between light and dark monochrome appearances, or current system setting. - Minimal use of user interface color so that tints in the user interface do not distract from or influence your artwork color choices. Acknowledgements. Thank you to Angela Ali, Jason M., Jeff Parker, Sandra Perez and Yoshiyuki Uchida for contributing artwork to the App Store screenshots. Please visit our website to see more of their artwork and for links to their portfolios. History. Brushes was originally created by Steve Sprang for iPhone in 2009 and for iPad in 2010. His last version, Brushes 3 was released in 2012, but was removed from the App Store in 2015. I took over development to modernise and support an app that has continued to be enjoyed by so many artists.
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.