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
Drawing with Carl
Simply the best drawing App for kids in the Appstore
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.1
127 ratings · Top 30%
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 included16 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 Drawing with Carl: map the core Education 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 like shapes, stickers, and text.
Assumption to check: Limited tools for advanced drawing features.
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the purchase process and clarify benefits of premium features.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a better search and filter system for tutorials.
Assumption to check: Difficulty in finding specific tutorials.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize the app for better performance on lower-end hardware.
Assumption to check: Occasional performance issues on older devices.
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
Simply the best drawing App for kids in the Appstore. 5 ***** and featured by Apple all over the world. Making beautiful drawings has never been so easy thanks to Carl. Import Pictures and draw over them. You can even play with talking stickers that repeat anything you say with a funny voice! Enjoy many powerful and easy to use tools that helps you make great drawings. Create your own sets with Talking Carl and draw Talking Monsters! Explore creative drawing with Mirror painting. Easily share your drawings and vote for the best ones. Write your name with sticker letters. Draw mustaches or funny eyes on your friends pictures. Add stickers of Carl and his friends. Share your creations on FaceBook or by email. Save to the photo Album. FEATURES: • Easy and fun drawing tools • Talking Stickers • Magical pattern paint bucket • Mirror drawing • Cool stickers of Carl and friends • Share on Facebook Wall • Email your drawings • Import from photo libraty • Save and load • iPad compatible Specifically designed for kids, Drawing with Carl help you make great drawings and share them with your parents and friends.
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 Navigation
Zustand
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.
