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
MyBrushes Pro - Sketch, Paint and Draw
On Sale for a limited time.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.2
10 ratings · Below Average
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/
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 MyBrushes Pro - Sketch, Paint and Draw: map the core Photo & Video 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
Focus on a modern and user-friendly UI with clear navigation.
Assumption to check: Poor user interface and experience leading to low ratings.
Validate with people who use this workflow before building.
Hypothesis 2
Offer a wider variety of brushes and customization options.
Assumption to check: Limited brush options and customization.
Validate with people who use this workflow before building.
Hypothesis 3
Implement seamless saving and exporting features.
Assumption to check: Lack of proper saving and export options.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize performance for handling larger canvas sizes.
Assumption to check: Performance issues with larger canvases.
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
On Sale for a limited time. MyBrushes Pro = UNLIMITED Size Canvas + UNLIMITED Layers + UNLIMITED Undo / Redo Steps = The Best Platform for Creative Freedom MyBrushes Pro is an unique painting application designed to create images and playback the whole painting process on UNLIMITED Size Canvas, and UNLIMITED Layers with UNLIMITED Undo / Redo Steps. It is the best creative platform for professional artists to sketch out what you imagine! MyBrushes Artist Gallery:(Each art piece drawing process could be playback when you browsing with MyBrushes app) http://www.mybrushes-app.com Video: https://www.youtube.com/watch?v=3n24xGmDNAo It has a simple and easy interface that you don't need knowledge of color system such as RGB, HSV and others. There are more than 100 preset realistic brushes to simulate the effect of Brush painting, Watercolor painting, Oil painting, Chinese painting, Drawing, Chinese Calligraphy, and so on. It allows anyone to easily create your own artworks even that you haven’t much knowledge on painting. It aims to be simple and fast at what it does. Packed with an ultimate fast drawing engine, MyBrushes Pro is the smart choice for both professional illustrators and occasional doodlers, adults and kids. MyBrushes Pro features highlights: - Layering system: • Unlimited layers（yes, even every layer is UNLIMITED size!) • Create, delete and re-order layers. • Duplicate and clear a layer. • Copy and paste layers. - Unique Painting Studio Features: • Unlimited size canvas. • Record and Playback your drawing videos. Previous painting and undo actions were saved. You can enjoy it or re-edit it during the playback. • Powerful painting engine to support fast painting, smooth and responsive painting (precision & performance). • Fully supports retina display; Painting effects sharpness is increased by 4 times. - Advanced Brush System: • Continuous auto-save—never loose work again. • Pressure-sensitive could be adjusted. • 100 shapes high-quality natural brushes: brush, pencil, pen, airbrush, watercolor brush, chalk, charcoal, neon pens, special effect pens... • Rapidly adjust the brush size. • Preview the final effect of each brush style. - Simple and Powerful Interface: • Undo / Redo function (Unlimited times! ) • Eraser tool to correct possible mistakes. - Artwork Gallery: • Export to image file. You can select to export artwork in a whole piece or divide huge artwork into several blocks without losing quality. • Share your artworks to facebook, twitter, email, and so on. • 50 kinds of background templates in template Library. Feedback: Any suggestion will be highly appreciated. Support email: [email protected]
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
Supabase
react-native-reanimated
expo-gesture-handler
react-native-svg
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.
