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
UsTwo - Draw Together
UsTwo is a shared drawing app made for friends and couples
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
29 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'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 UsTwo - Draw Together: map the core Lifestyle 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 brush styles and effects.
Assumption to check: Limited drawing tools compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Optimize real-time collaboration with better state management.
Assumption to check: Performance issues with multiple users drawing simultaneously
Validate with people who use this workflow before building.
Hypothesis 3
Implement better categorization and tagging of saved drawings.
Assumption to check: Difficulty in saving and organizing drawings
Validate with people who use this workflow before building.
Hypothesis 4
Add social features to engage users, such as comments and likes on drawings.
Assumption to check: Lack of social features like comments or likes
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
UsTwo is a shared drawing app made for friends and couples. You and your partner get a canvas that lets you draw on it and doodle together in realtime. HOW IT WORKS -Pair with your partner using a simple code. Once connected, everything you draw syncs instantly. Leave a doodle before bed, send a note during lunch, or just scribble something silly. LOCK SCREEN & HOME SCREEN WIDGETS -Add your shared canvas as a widget. Choose from multiple sizes and pick a gradient theme that fits your style. Your drawings live right on your lock screen, no need to open the app. DRAWING TOOLS -Choose from a variety of tools such as pencil, eraser, different shapes, lines, text, and highlighter. Adjust stroke size and pick from a full color wheel to make it yours. DAILY STREAKS -Keep your streak alive by drawing together every day. A small nudge to stay connected, one doodle at a time. SHARE YOUR DRAWINGS -Export your canvas as an image and share it anywhere. You can also tap to send your partner a notification so they know to check out your creative drawing. USTWO PRO -UsTwo Pro gives both you and your partner access to all pro features, where only one of you needs to subscribe. Get all drawing tools, premium gradient themes, custom colors, and watermark-free sharing. Privacy Policy: https://us-two.app/privacy Terms of Use: https://us-two.app/terms Apple's EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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
TypeScript
React Navigation
Zustand
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.
