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
Hey Duggee Colouring
**** As seen on Nick Jr
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.2
8 ratings · Below Average
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 Hey Duggee Colouring: 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 more diverse themes and characters to appeal to a broader audience.
Assumption to check: Limited variety of coloring pages.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly and engaging way to introduce premium content.
Assumption to check: In-app purchase prompts may disrupt the user experience.
Validate with people who use this workflow before building.
Hypothesis 3
Add interactive elements to enhance creativity and engagement.
Assumption to check: Lack of interactive features like stickers or animations.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize image loading and rendering for better performance.
Assumption to check: Performance issues with heavy images.
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
**** As seen on Nick Jr. **** Duggee's back with his new colouring app! Pick a picture and use one of our awesome colouring tools to make the drawing your own - there are 40 designs to choose from! Safe, ad-free fun for your little ones! Key Features: • Clear and simple interface designed for pre-schoolers. • 40 different colouring images to play with. • Colour the pictures any way you like with any combination of tools, free-form and block-fill. • Fun colouring tools including paint, pencils, spray-cans, glitter and even pattern rollers. • Lots of colours and patterns to choose from. • Save your creations to your camera roll to keep them forever. So what are you waiting for? Get creative! Customer Care: If you experience any technical issues with this app please get in touch. Most issues can be easily fixed and we are happy to help. Contact us at [email protected] Privacy: This app will ask for permission to access the camera on your device. The camera is used to take a photograph of the player for their user profile which is used to track and retain progress through the game. This app does not collect or store any personal data from your device. View our privacy policy here www.bbcworldwide.com/home/mobile-apps/ About Studio AKA: STUDIO AKA is a multi-BAFTA winning & Oscar-nominated independent animation studio & production company based in London. They are known internationally for their idiosyncratic & innovative work expressed across an eclectic range of projects. www.studioaka.co.uk About Scary Beasties: Scary Beasties is a BAFTA-winning mobile and online games designer and developer specialising in kids’ content, from pre-school through to the teen market. Be the first to hear about our other apps: on twitter @scarybeasties or www.facebook.com/scarybeasties A Scary Beasties production for BBC Worldwide
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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 Navigation
Expo Image Manipulator
Async Storage
React Native Gesture Handler
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.
