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
Colorify: Coloring Book Maker
Colorify - AI Photo to Sketch Drawing Art & Coloring Book Maker
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
6,678 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 Colorify: Coloring Book Maker: 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
Offer a wider range of colors and patterns.
Assumption to check: Limited color options compared to other apps
Validate with people who use this workflow before building.
Hypothesis 2
Introduce features like layers for more complex artwork.
Assumption to check: Lack of advanced features (e.g., layers, effects)
Validate with people who use this workflow before building.
Hypothesis 3
Optimize app performance for older hardware.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 4
Expand sharing options to include social media integrations.
Assumption to check: Limited sharing options
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
Colorify - AI Photo to Sketch Drawing Art & Coloring Book Maker Transform any picture into a printable coloring page using the power of AI! Colorify is a fun, creative photo editor that turns your favorite images into beautiful line drawings, pixel art, or sketches — perfect for kids and adults. From family portraits to pet photos, turn memories into artistic masterpieces in seconds! With Colorify, you can easily convert a photo to pencil sketch, create cartoon-style art, or generate unique colour by number pages. Ideal for printing or digital coloring fun, it’s your all-in-one coloring book maker and drawing editor — made for everyone. Key Features: • AI-powered photo to sketch conversion • Create your own Color by Number pages • Choose Simple, Detailed, or Pixel Art styles • Add doodles or edit photos with artistic effects • Draw, paint, or print anytime • Safe and ad-free — fun for kids and adults • Premium unlocks HD, advanced styles, and more Perfect for: • Parents & children who love to draw • Teachers, artists & hobbyists • Unique gifts & party activities • Anyone who enjoys sketching, painting, or editing photos To use the Colorify app you must subscribe weekly, monthly, or yearly packages. Subscription prices may vary by location and all subscriptions are automatically renewed. Questions? Visit our Help Center: [email protected] Privacy Policy: https://www.yoyamobile.co/privacy-policy Terms and Conditions: https://www.yoyamobile.co/terms-conditions Ready to turn your pictures into printable, personal art? Download Colorify – AI Sketch & Coloring Book Editor today and bring your world to life!
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
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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.
