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
BBC Colouring: Doctor Who
BBC Colouring: Doctor Who – the official app from BBC Worldwide.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
11 ratings · Top 50%
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 BBC Colouring: Doctor Who: 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
Expand the range of coloring pages and tools to enhance user engagement.
Assumption to check: Limited coloring options and pages available.
Validate with people who use this workflow before building.
Hypothesis 2
Implement clearer pricing structures and notifications for in-app purchases.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the UI for a more enjoyable coloring experience.
Assumption to check: User interface may feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance to ensure smooth coloring experiences across all devices.
Assumption to check: Performance issues on some 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
BBC Colouring: Doctor Who – the official app from BBC Worldwide. Planets, galaxies, villains, heroes, the TARDIS, the time vortex and every incarnation of the Doctor - all intricately illustrated in this timey wimey digital colouring book packed with Doctor Who art. With 51 stunning images to colour, this out-of-this-world app is perfect for any creative Doctor Who fan. - Enter a gallery and choose a picture: Doctors; Enemies; Patterns; Scenes; Lettering - Tap to colour in: Pick from hundreds of colours arranged in a spectrum of palettes - Save your sensational pictures in your artwork library - Share your impressive creations with all your friends using our in-built sharing functionality - Check out our ‘Be Inspired’ gallery for inspiration or search social media using #doctorwhocolouring Customer Care: If you experience any technical issues with this app please get in touch with our Customer Care Team. Most issues can be easily fixed and we are always happy to help. Contact us at [email protected] Privacy: This app does not collect or store any personal data from your device. View our privacy policy here https://www.bbcworldwide.com/home/mobile-apps/ About BBC Worldwide: BBC Worldwide create commercial products that help fund BBC productions. About Scary Beasties: Scary Beasties is a mobile and online games designer and developer. Be the first to hear about our other apps: on twitter @scarybeasties or www.facebook.com/scarybeasties. Check out our website: www.scarybeasties.com. 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 Native
Expo
Zustand
react-navigation
expo-image-picker
react-native-gesture-handler
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.
