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
Simple Sketch
Transform your iPad, iPhone, or Mac into a powerful digital sketchbook with Simple Sketch, the intuitive drawing app designed for artists, designers, students, and anyone who loves to create.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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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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.
What's included15 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 Simple Sketch: 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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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
Introduce more drawing tools and options for customization.
Assumption to check: Limited tool options compared to other design apps
Validate with people who use this workflow before building.
Hypothesis 2
Enhance sharing features to include social media integration.
Assumption to check: Inadequate sharing options for sketches
Validate with people who use this workflow before building.
Hypothesis 3
Implement collaboration tools for multiple users to edit sketches.
Assumption to check: No collaborative features for real-time editing
Validate with people who use this workflow before building.
Hypothesis 4
Create an onboarding experience to guide new users through app features.
Assumption to check: Lack of tutorial or onboarding for new users
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
Transform your iPad, iPhone, or Mac into a powerful digital sketchbook with Simple Sketch, the intuitive drawing app designed for artists, designers, students, and anyone who loves to create. Pure Drawing Experience Simple Sketch offers a distraction-free drawing environment with a large canvas that lets your creativity flow without boundaries. Whether you're sketching quick ideas, creating detailed illustrations, brainstorming new ideas, or taking visual notes, our clean interface keeps you focused on what matters most - your art. Professional Drawing Tools - Pencil Tool: Range of pencil types from 6H to 6B for sketching and shading - Pen Tool: Precise fine-liner for clean lines and detailed work - Smart Eraser: Vector-based erasing for smooth corrections - Adjustable Tool Sizes: From fine details to bold strokes Precision Drawing Guides Take your sketches to the next level with built-in drawing guides: - Grid Guide: Perfect dots for proportional drawing - Graph Paper: Major and minor grid lines for technical sketches - Line Guide: Horizontal guides for writing and sketching - Isometric Guide: 3D perspective drawing made simple Multi-Page Sketchbook Organize your ideas across unlimited pages with intuitive navigation. Add new pages instantly, jump between sketches with the table of contents, and never lose track of your creative process. Intelligent Input Modes - Apple Pencil Mode: Dedicated pencil-only input for iPad artists - Universal Mode: Works with any input method on all devices - Auto-detection: Optimizes for your device automatically Effortless Organization - Auto-save: Never lose your work again - Unlimited Undo/Redo: Experiment fearlessly - Page Management: Add, delete, and rearrange pages with ease - Zoom & Pan: Infinite canvas with smooth navigation Cross-Platform Creativity Whether you're using an iPad with Apple Pencil for detailed artwork, an iPhone for quick sketches on the go, or a Mac for precise digital illustration, Simple Sketch adapts to your workflow seamlessly. Perfect For: - Artists & Illustrators: Professional-grade tools in a simple package - Students: Note-taking with visual elements and diagrams - Designers: Quick mockups and wireframes - Engineers: Technical drawings with precision guides - Anyone: Who loves to draw, doodle, or visualize ideas Get Simple Sketch today and rediscover the joy of drawing digitally. Your next masterpiece is just a tap away. No ads, no subscription!
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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
Expo
Supabase
react-navigation
react-native-reanimated
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.
