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
The Last Whale Singer Book
This interactive storybook brings the beloved animated film THE LAST WHALE SINGER to life as an exciting read-along experience
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included15 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 The Last Whale Singer Book: map the core Books 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 user engagement with interactive reading features.
Assumption to check: Limited interactivity compared to physical books
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clearer system for tracking reading progress.
Assumption to check: Difficulty in managing reading progress
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription options and provide clear value.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social features for sharing notes and highlights.
Assumption to check: Lack of community features
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
This interactive storybook brings the beloved animated film THE LAST WHALE SINGER to life as an exciting read-along experience. Designed for children ages 6 to 8, it was created specifically for smartphones and tablets. With lovingly hand-drawn artwork inspired by the film's characters and worlds, the app invites children to dive deeper into Vincent's ocean adventure through narrated storytelling, playful games, and educational content. Join Vincent, a very special humpback whale from the family of "Whale Singers" who can sing magical songs that heal and protect the oceans and all sea creatures. On his thrilling journey with his friends, Vincent discovers the unique power of his song and learns about the important mission he must fulfill. The book is packed with fun games and activities! Children can solve puzzles, play memory games, find differences in spot-the-difference challenges, play a "Vincent Says" game, and discover cool ocean facts. What's Inside - Fully narrated, interactive read-along experience, currently available in English (American), German, and French (Canadian) - Fun puzzles, memory games, “Simon says” and spot-the-difference challenges - Educational ocean facts
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
Firebase
React Navigation
Redux
React Native Paper
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.
