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
ElevenReader: Read Books Aloud
Listen to anything — bestsellers, PDFs, docs, articles — in stunningly natural voices you'll love.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
10,289 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.
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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 included18 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 ElevenReader: Read Books Aloud: map the core Productivity 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
Allow users to upload multiple formats and parse their contents.
Assumption to check: Limited book format support (e.g., PDF, EPUB)
Validate with people who use this workflow before building.
Hypothesis 2
Integrate more voice options and accents for personalization.
Assumption to check: Voice selection may not be diverse enough
Validate with people who use this workflow before building.
Hypothesis 3
Implement a feature to download books for offline reading.
Assumption to check: No offline access to books
Validate with people who use this workflow before building.
Hypothesis 4
Clarify subscription benefits and provide better trial options.
Assumption to check: Subscription model can be confusing
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
Listen to anything — bestsellers, PDFs, docs, articles — in stunningly natural voices you'll love. ElevenReader is one of the highest-rated reader apps that lets you read books aloud, turn PDFs into audio, and listen to thousands of best-selling audiobooks. Hear the difference as one of the most natural-sounding text to speech (TTS) apps — powered by leading voice technology in 30+ languages. WHY READERS CHOOSE ELEVENREADER Thousands of Audiobooks Your next obsession is waiting. Bestselling audiobooks, eBooks, and hidden gems — many read aloud in voices you choose. Romance, fantasy, thrillers, sci-fi, and more, with new titles every week. 1,000+ AI Voices You Choose Pick your narrator for your uploaded files or select eBooks and audiobooks. Choose from 1,000+ voices in 30+ languages that actually sound human. No robotic narration. Just natural listening. Read PDFs Aloud Instantly Upload any PDF, doc, ePub, or article link. ElevenReader transforms text to audio in seconds. Iconic Voices Hear classics narrated by legendary voices — Michael Caine, Judy Garland, James Dean, Burt Reynolds, Maya Angelou, Richard Feynman, and more. AI audio at its most magical. TURN ANYTHING INTO AUDIO • Read books aloud — bestsellers, romance series, and classics • Read PDFs aloud — reports, study notes, research papers • Listen to news, blogs, and newsletters like podcasts • Import from other text files, docs, web links, or paste text • Read aloud fluently in 30+ languages with natural-sounding accents FEATURES YOU'LL LOVE • 1,000+ voices — choose by accent, tone, and style • Text highlighting — perfect for dyslexia, ADHD, and learning support • Adjustable speed — 0.25x to 4x playback • Offline listening — download and listen anywhere • Create your own voices — Design and customize your narrator's voice • Sleep timer — drift off to your favorite book • Pronunciation dictionary — customize pronunciations for names or words • Bookmarks — never lose your place and add notes • Sync across devices — start on phone, continue on tablet or web THOUSANDS OF FREE BOOKS Explore timeless audiobooks and eBooks at no cost: The Great Gatsby, Pride and Prejudice, Frankenstein, Anna Karenina, Moby Dick, Alice in Wonderland, The Adventures of Sherlock Holmes, War and Peace, The Odyssey, Don Quixote, and thousands more. BETTER THAN EXPENSIVE AUDIOBOOK SUBSCRIPTIONS ElevenReader gives you more listening for less. No confusing credits. No overpriced subscriptions. Just thousands of premium audiobooks and eBooks for less, plus content you bring. ULTRA MEMBERSHIP Access thousands of audiobooks and ebooks, unlimited TTS, and powerful features like offline mode and voice design with ElevenReader Ultra. If you're new to ElevenReader, you can try membership for free and take your listening to a new level. PERFECT FOR • Anyone who prefers listening to reading • Bookworms who want to listen to audiobooks • Commuters who want to read more • Students turning PDFs and textbooks into audio • Professionals listening to reports and articles Powered by ElevenLabs — the leading AI voice model trusted by millions. Terms of Service: https://elevenreader.io/elevenreader-terms Privacy Policy: https://elevenlabs.io/privacy
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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
Supabase
zustand
expo-av
@react-navigation/native
BUILD KIT DIFFICULTY
Advanced
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.
