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
Epic - Kids' Books & Reading
Epic is the world’s largest digital library for kids! Our fun, kid-safe, interactive reading app fuels curiosity and reading confidence by letting kids freely explore their interests with instant access to 40,000+ boo...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
519,347 ratings · Top 15%
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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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Epic - Kids' Books & Reading: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Epic is the world’s largest digital library for kids! Our fun, kid-safe, interactive reading app fuels curiosity and reading confidence by letting kids freely explore their interests with instant access to 40,000+ books, audiobooks, learning videos and more. Anytime, anywhere: Access our library from any Apple device. You can even download books to read offline! Books that read to them: In addition to our library of more traditional ebooks, we have a huge collection of Read-To-Me books and audiobooks. Featuring talented voice actors, fun music and exciting sound effects that bring stories to life! Multilingual: The majority of books on Epic are in English, but we also have books in Spanish, French, Chinese and Gaelic to engage readers of different backgrounds and interests. Fun rewards and learning tools: Reading Buddies, badges and quizzes keep them motivated to read and learn. Spotlight Words and audio-enabled Dictionary Lookup teach vocabulary and pronunciation. FOR FAMILIES: EPIC FAMILY A paid subscription beginning with a 7-day free trial. Cancel anytime. • Up to 4 child profiles, so each kid can enjoy a personalized reading experience. • Parent dashboard lets you see what they’re reading and follow along with their progress. • 95% of Epic parents say Epic helped improve their child’s reading skills. FOR EDUCATORS: EPIC SCHOOL Epic School is free for educators and students to use during the school day. • ELA Tools: Filter titles by AR, DRA, F&P, grade level and more. • Quizzes, Dictionary Lookup and Spotlight Words help build skills. • Help with Daily 20: Teachers can easily assign and share books, then track daily and weekly reading. • Multilingual books and fun reading formats make reading accessible for every student. • 9 out of 10 Epic Educators would recommend us to colleagues. • Also available: Epic School Plus, a district-funded premium offering that gives educators and students 24/7 access to the full Epic library. PRESS AND EXPERT REVIEWS Epic has been featured on The TODAY Show, CNET and Refinery 29, as well as in The Wall Street Journal, Parents Magazine, USA Today, Forbes, Parenting.com and more. “Epic strikes the perfect balance between educational and fun, and should allow parents to feel more confident about introducing the iPad into their children’s daily lives as a tool.” –TechCrunch "Get access to thousands of books on all subject matters" –Parenting.com "Epic is incredibly valuable because it gives students exposure to books that they wouldn't get from a library or our classroom." –Cindy, Epic Educator Ambassador Privacy Policy getepic.com/privacy Terms of Service getepic.com/tos
Written user reviews are not shown here. Check current App Store reviews >
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 a wider selection of free books and resources.
Assumption to check: Limited content for free users
Validate with people who use this workflow before building.
Hypothesis 2
Implement clearer labels and onboarding tutorials.
Assumption to check: Navigation can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription management process with clearer options and prompts.
Assumption to check: Subscription management is cumbersome
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download books for offline reading.
Assumption to check: No offline access to books
Validate with people who use this workflow before building.
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
Zustand
React Navigation
BUILD KIT DIFFICULTY
Expert
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.
