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.
Book Echo — The Ebook Reader That Reads to You
$1.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Book Echo: 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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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
Assumption to check: Limited social features for sharing reviews and recommendations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of personalized recommendations based on reading history.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline reading capability for added convenience.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases may not be clearly communicated.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Book Echo — The Ebook Reader That Reads to You Most ebook readers let you read. Book Echo lets you listen — with neural AI voices so natural, you'd think a real person was reading to you. NATURAL AI VOICES, NOT ROBOTS Book Echo uses advanced neural voice synthesis to deliver expressive, human-like narration in English, 中文, 日本語, and 30+ other languages. Each voice has natural intonation, rhythm, and emotion — the closest thing to a personal audiobook narrator, built right into your reader. READ WITH BACKGROUND MUSIC Set the mood with 17 curated soundscapes — rain, forest, ocean waves, lo-fi, white noise, and more — layered seamlessly under your reading or AI narration. Create your perfect atmosphere and lose yourself in the story. YOUR BOOKS STAY YOURS Your books and reading history never leave your device. No tracking, no ads, no account required. The only data sent to our servers is the text being read aloud — used solely to generate audio and never stored. READ ANY FORMAT EPUB, PDF, TXT, Markdown, HTML, FB2, MOBI, and CBZ comics. Bring your own books from any source — no format lock-in, no proprietary ecosystem. READ OR LISTEN — YOUR CHOICE Seamlessly switch between reading and listening. Tap play and Book Echo reads aloud with real-time sentence highlighting, so you always know where you are. Perfect for commutes, workouts, or when your eyes need a break. EVERYTHING A SERIOUS READER NEEDS • Bookmarks — save any spot and jump back instantly • Four-color highlights with persistent rendering • Full-text search with precise in-chapter jump • Built-in dictionary lookup (long-press any word) • Themes (light / dark / sepia), font size, line spacing • Auto-generated chapter outlines and covers WORKS OFFLINE TOO Reading is always 100% offline. For listening without internet, switch to the built-in system voice — your reading never stops, wherever you are. WHAT MAKES BOOK ECHO DIFFERENT • Neural AI voices in 30+ languages • Background music & ambient soundscapes during read-aloud • 100% private — no cloud sync, no tracking, no account • No ads, no in-app purchases, no subscriptions • 8 ebook formats supported, no lock-in • Distraction-free — no social features, no engagement tricks ONE PURCHASE. EVERYTHING UNLOCKED. No subscriptions. No in-app purchases. No ads. No "basic vs. pro" tiers. Every voice, every format, every soundscape — yours from the moment you install. Less than the price of a coffee for a reader that actually respects you. Try Book Echo and rediscover the joy of reading — with your eyes or your ears.
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.