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
Numberblocks: Card Fun!
The BAFTA-winning pre-school learning show Numberblocks brings you Numberblocks - Card Fun!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
85 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 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 Numberblocks: Card Fun!: 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 regular updates with new games and challenges.
Assumption to check: Limited game variety leading to quick user fatigue
Validate with people who use this workflow before building.
Hypothesis 2
Implement clear parental controls and purchasing limits.
Assumption to check: In-app purchases may confuse young users
Validate with people who use this workflow before building.
Hypothesis 3
Add detailed progress reports and notifications.
Assumption to check: Progress tracking can be unclear for parents
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and visual design for better usability.
Assumption to check: User interface can feel cluttered
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
The BAFTA-winning pre-school learning show Numberblocks brings you Numberblocks - Card Fun! This app features four game modes and five packs of cards offering 60 levels of different gameplay that will help you help your child with their numeracy skills. It features Numberblocks 1 to 10. As seen on Cbeebies. ● Snap - Find a snap when you see two cards with matching values, this could be Numberblock One and one Apple or numeral six and six Numberblobs. ● Match - Turn over the cards to find matching pairs of card value. The values could be anything from a mix of things to stamps. ● Add it up - A series of addition equations that feature different card packs and card values. You will be adding Numberblocks, Stamps, Things, Numberblobs and numerals. ● Take it away - A series of subtraction equations that feature different card packs and card values. You will be adding Numberblocks, Stamps, Things, Numberblobs and numerals. When a level is completed a new one with increasing complexity will unlock. Also, your card packs will increase in size with larger values helping to offer a challenging experience that will help your child to progress with their number literacy. This app does not contain any in-app purchases or involuntary adverts.
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
@supabase/supabase-js
react-native-reanimated
BUILD KIT DIFFICULTY
Starter
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.
