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
culur: Custom Color by Number
Turn any photo into a printable Color by Number quickly and easily! Enjoy endless hours of fun turning YOUR pictures into Color by Number masterpieces!
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
144 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.
Build your own version
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's included18 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 culur: Custom Color by Number: 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
Incorporate user-generated content and daily challenges to keep engagement high.
Assumption to check: Limited variety of artworks leads to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clear onboarding process that explains the value of premium features.
Assumption to check: In-app purchases may confuse users with unclear benefits.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a smart color selection tool that suggests colors based on user preferences.
Assumption to check: Color selection can be tedious with many colors to choose from.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing features and user galleries to foster community engagement.
Assumption to check: Lack of community features limits social interaction.
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
Turn any photo into a printable Color by Number quickly and easily! Enjoy endless hours of fun turning YOUR pictures into Color by Number masterpieces! What is culur? Culur is an app that allows you to turn your own images instantly into a printable Color by Number! Watch as your favorite pictures are transformed into artistic masterpieces before your very eyes! Effortlessly upload a photo from your phone and with a few easy clicks quickly create your customized Color by Number. Simply select the image you wish to color, your preferred set of colored pencils/crayons, your desired difficulty, and let culur do the rest! The entire process takes less than a minute with easy printing directly from the app. Create beautiful and customized Color by Numbers art of your family, friends, pets, and even beloved cartoons. Great for both adults and kids! What is a Color by Number? - Your picture is transformed into a colorless image that is split up into sections, each of which has a designated number. - A color legend is provided, specifying which color corresponds to each number on the image. - You color in each section as indicated to reveal beautiful colorful artwork, created by you! Unique Key Features: - Turn YOUR photos into a Color by Number in less than a minute! - Create UNLIMITED Color by Numbers. - Print/Share/Save your Color by Number directly in the app! - No subscriptions, in app purchases or hidden fees! - Works for all types of images including photos you took, scenery, cartoons, logos, picture of celebrities, etc YOU WILL NEVER HAVE TO BUY A COLORING BOOK AGAIN!!! No other app allows you to turn YOUR photos into a Color by Number and print them directly from the app. This one-time purchase can translate into hours of entertainment for adults and kids, endless date night ideas, and countless activities with friends! Steps to use the app: 1. Upload or take a photo in the app 2. Select the set of colored pencils, markers or crayons you wish to use (i.e., 60 pack of colored pencils) 3. Select the difficulty 4. Select if the uploaded image is a cartoon or not 5. Generate your Color by Number 6. Print your Color by Number 7. Color and enjoy! We love feedback! Feel free to contact us at [email protected]
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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
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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.
