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 & Friends Stories
Make Numberblocks & Friends Stories (brought to you by Blocks Universe) part of your child's daily routine with SEVENTEEN original audio tales designed to help your child drift off to sleep and SIX interactive stories...
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
7 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
Make this idea yours
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Numberblocks & Friends Stories: 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
Enhance engagement with more interactive quizzes and games.
Assumption to check: Limited interactive content for children
Validate with people who use this workflow before building.
Hypothesis 2
Implement a subscription model for more accessible content.
Assumption to check: High price point for a single purchase
Validate with people who use this workflow before building.
Hypothesis 3
Provide better offline support for stories and quizzes.
Assumption to check: Lack of offline accessibility for some features
Validate with people who use this workflow before building.
Hypothesis 4
Regularly add new stories and quizzes to keep content fresh.
Assumption to check: Inconsistent updates and new content
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
Make Numberblocks & Friends Stories (brought to you by Blocks Universe) part of your child's daily routine with SEVENTEEN original audio tales designed to help your child drift off to sleep and SIX interactive stories, providing your child a hands-on opportunity to help their favourite characters stories' unfold: 1. One's Big Band 2. See-Saw 3. Numberblock Three and the Kittens 4. Four Goes on a Square Hunt 5. Where are the Numberblobs? 6. One Great Mystery 7. The No Nap Spell 8. A Walk in the Woods 9. Go to Sleep, Sheep 10. Blue's Big Blue Picnic 11. Pattern Palace 12. The Rainbow Puzzle 13. The Perfect Christmas Plan 14. One and the Apple Tree 15. Two and the Magic Socks 16. Three's Great Adventure 17. Four Goes to Squareland 18. Five, Four, Three, Two, One 19. Six is on a Roll 20. Seven's Rainbow Ducklings 21. Octoblock and the Forget-O-Ray 22. Nine and the Windy Day 23. Ten Little Numberblobs Whether it's a calming moment in the day, or time to go to sleep - wind down, snuggle up and relax whilst listening to calming stories featuring your favourite Numberblocks, Alphablocks, Colourblocks & Wonderblocks. The audio-only stories feature relaxing music, soothing narration and ambient sounds and do not require screens; perfect for bedtime and nap time. The interactive stories allow an opportunity for your child to help the narrative unfold alongside their favourite Blocks characters - what fun! Developed in consultation with child development and child psychology experts, Numberblocks & Friends Stories (brought to you by Blocks Universe) is made by the multi-award-winning team behind BAFTA-nominated pre-school learning favorites, Alphablocks, Numberblocks, Colourblocks & Wonderblocks. ""The gentle narration of Numberblocks & Friends Stories and relaxing music combine to help children relax, wind down after a busy day and prepare for sleep."" Dr. Barbie Clarke, child and adolescent psychotherapist. This app does not contain any in-app purchases or involuntary adverts. What's included in Numberblocks & Friends Stories (brought to you by Blocks Universe)? 1. SEVENTEEN original audio stories to help your child drift off to sleep. 2. SIX original interactive stories to allow your child a hands-on opportunity to help the story unfold. 2. Wind down, relax and snuggle up with your favorite Blocks characters. 3. Calming stories, relaxing music, perfect for bedtime and nap time. 3. Make Numberblocks & Friends Stories (brought to you by Blocks Universe) part of your child's daytime and bedtime routine. 4. This app is entertaining and safe, being COPPA and GDPR-K compliant and 100% ad-free. Privacy & Safety: At Blue Zoo Digital, your child’s privacy and safety is the first priority for us. There are no ads in the app and we will never share personal information with any 3rd parties or sell this on. You can find out more in our Privacy Policy and Terms of Service: Privacy Policy: https://blocks-website.webflow.io/privacy-policy Terms of Service: https://blocks-website.webflow.io/terms-of-service
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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
Axios
React Navigation
React Native Async Storage
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.
