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
Silk 2 – Generative Art
Draw beautiful flowing art with Silk
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
902 ratings · Top 15%
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 Silk 2 – Generative Art: 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
Provide more brush styles and shapes for users.
Assumption to check: Limited customization options for creating art
Validate with people who use this workflow before building.
Hypothesis 2
Optimize rendering for smoother performance.
Assumption to check: Performance issues with complex artworks
Validate with people who use this workflow before building.
Hypothesis 3
Integrate direct sharing to social media platforms.
Assumption to check: Inconvenient sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Add user profiles and a social feed for sharing and discovery.
Assumption to check: Lack of community features
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
Draw beautiful flowing art with Silk. With Silk's award-winning magic brush, anyone can be an artist. Featured by Apple as one of their favorite apps. Relax, express yourself, and create mandalas and wallpapers. With the swish of a finger, Silk strands mingle and fuse, weaving together into wonderful works of art. Silk supports all iPhones and iPads, is enhanced for 3D touch, and specifically designed for the Apple Pencil. Buy once, run everywhere! "I can't believe even someone like me can create something cool looking in this thing. That's amazing!" ~ nickknw "Awesome! All I can think is woahdude." ~ MayhemMark - The official app of the award-winning website weavesilk.com, with millions of users - High-resolution export for poster prints or wallpapers - Eraser, a rainbow color, many new color palettes - Optimized for larger iPhones, iPad, and iPad Pro - Support for the Apple Pencil and 3D touch - Great for artists and non-artists alike - Cross-platform: play on your iPhone/iPod touch, iPad, and iPad Pro - Original music and sound created for Silk - Create gorgeous wallpapers with the swish of a finger. The creature sketch in the iPhone screenshots was drawn by Oliver Wetter (www.fantasio.info) and the silk eye was drawn by Daniel Coonfield.
Written user reviews are not shown here. Check current App Store reviews >
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
Expo
Firebase
react-navigation
expo-sharing
@react-native-community/slider
BUILD KIT DIFFICULTY
Intermediate
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.
