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.
Zen Brush 3 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush which can be used to perform calligraphy, ink painting and more.
$4.99 · 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.
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Combine features and design from your favorite apps.
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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 Zen Brush 3: 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 can frustrate users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Performance issues on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features to share artworks
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.
Zen Brush 3 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush which can be used to perform calligraphy, ink painting and more. The drawing system that brings to life a feeling of silky fluent and delicate painting now allows an even wider range of expression thanks to the addition of "water" and "color". Providing a new simple and intuitive user interface, this app is designed to be optimal for performing Zen art. Simply start the app and you are immediately ready to draw. Anyone, anywhere, can create superb Zen art with this app’s uniquely rich expressiveness. You can also easily share and edit your calligraphy and images with other apps using the Export functionality. Skillfully use the rich background style templates to create and share atmospheric artwork. - The drawing system simulates a 3D model of an East Asian ink brush to enable varied and natural styles of brush handling. - The adjustable amount of water makes it possible to create expressions ranging from powerful edge effects to "nijimi" (bleeding) and "bokashi" (blurring) where colors mix. - You can also enjoy creating colored-ink paintings as well as watercolor paintings by making use of 30 selected traditional Japanese colors. - The layer functionality allows more flexible editing. - Import photos to add text to them or use them as background images for tracing. - Create fascinating artwork with a rich assortment of background style templates. - Traditional Japanese paper templates provide an authentic feel. Features: - 5 main tools (ink brush, color brush, water brush, eraser, blotting paper). - 10 levels of thickness. - 5 levels of water (not applicable to blotting paper). - 10 levels of ink tone (not applicable to water brush and blotting paper). - Color palette with 30 colors. - 89 background style templates. - Drying functionality (fast dry, instant dry, adjustable natural dry). - Layers functionality (import image / color adjustment / move / rotate / scale / reverse left and right / white transparency / gradation effect). - Guide display (character guides / partition guides / grid guides). - Movable toolbar (top / bottom / left / right). - Canvas zoom (zoom in and out with pinch gestures). - Undo / redo (5 levels). - Export functionality (formats: JPEG, PNG, transparent PNG (no background)). - Support for Apple Pencil (1st and 2nd generation). - Support for 3D Touch (where available: iPhone 6S - XS). - Drawing tool selection (finger and stylus / stylus only). - Adjustable brush pressure sensitivity (5 levels, with supported stylus only). - Adjustable tilt sensitivity (5 levels, with supported stylus only). - Gesture functionality (pinch zoom and drag, zoom toggle with 2-finger tap). - 3D brush display (enable / disable). - Pointer display (enable / disable). - 5 levels of canvas resolution with a maximum of 3072 x 4096 pixels (the higher resolutions do not work on devices with lower specs).
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.