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.
App Overview
Zen Brush 2
Zen Brush 2 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.9
130 ratings · Top 50%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Zen Brush 2: map the core Entertainment workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Offer a wider range of brushes and customizable effects.
Assumption to check: Limited brush options and effects
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for smoother drawing experience.
Assumption to check: Occasional lag during complex drawings
Validate with people who use this workflow before building.
Hypothesis 3
Implement better archiving and categorization features.
Assumption to check: Difficulty in saving and organizing artwork
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing features for users to showcase their work.
Assumption to check: Limited social sharing options
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Zen Brush 2 is a drawing app focused on the strong yet beautiful feel of the East Asian ink brush. With a new drawing engine that brings to life a feeling of silky fluent painting and the delicacy of an ink brush, providing a simple and intuitive user interface imbued with the Zen spirit, this app is designed to be optimal for performing Zen art. Simply start the app and you are immediately ready to draw. Anyone can create superb Zen art anywhere and at any time with this app’s uniquely rich expressiveness. You can publish your work to Facebook and Twitter with the "Share" and "Open in" functions. You can also share or edit your images by opening them in other apps such as Instagram, WhatsApp, LINE, Photoshop Mix, etc. - The next step in the evolution of the Zen Brush app which achieved more than 1.5 million downloads on all platforms combined. - Includes a new brush engine providing an even stronger, beautiful expressiveness. - Includes a gallery feature that makes it possible to save your work in progress. - Includes red ink in addition to the black ink (*). - Ink dispersion effect enables a three-dimensional feeling of depth. * Actual colors vary depending on the template. Features: - 92 background style templates. - Simple brush size adjustment with slider. - Simple main tools: Ink brush, red brush, eraser brush. - 3 levels of ink dispersion. - 3 levels of ink tone. - Canvas zoom (zoom in and out with pinch gestures). - Guide lines (9 types). - Undo / redo (5 levels). - Save your work to the photo library. - Open in other apps (Formats: JPEG, PNG, transparent PNG (no background)). - Share artwork (Facebook, Twitter, etc.). - Simulated finger pressure. - Support for pressure sensitive styluses. * Apple Pencil / Wacom Bamboo Stylus / Adonit / Scriba / SonarPen - Support for iPad Pro. - Support for 3D Touch. - Adjustable brush pressure sensitivity (5 levels). - Adjustable tilt sensitivity (5 levels). * Requires a pen that supports tilt. - Supports multitasking (Slide Over / Split View). - Support for iMessage App.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
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BUILD KIT DIFFICULTY
Advanced
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.
