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
Gutenberg Reader PRO: No ADS!
Gutenberg Reader PRO – The Ultimate Free eBook & Classic Book Reader - NO ADS
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.1
10 ratings · Below Average
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 included16 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 Gutenberg Reader PRO: No ADS!: 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
Can integrate more book sources and libraries.
Assumption to check: Limited book selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Use modern design principles and enhance UX.
Assumption to check: User interface feels outdated
Validate with people who use this workflow before building.
Hypothesis 3
Implement better error handling and testing.
Assumption to check: Frequent crashes reported by users
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer explanations of premium features.
Assumption to check: In-app purchase process is unclear
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
Gutenberg Reader PRO – The Ultimate Free eBook & Classic Book Reader - NO ADS Discover 100,000+ Free eBooks with Project Gutenberg If you love books, novels, and classic literature, this is the perfect eBook reader for you! With Gutenberg Reader PRO, you can access over 100,000 free eBooks from Project Gutenberg, including timeless classics, historical texts, philosophy, poetry, and more. Enjoy reading legendary works from Jane Austen, Mark Twain, Charles Dickens, Oscar Wilde, Victor Hugo, Emily Brontë, and many others—all legally available in the public domain. What is Project Gutenberg? Project Gutenberg is the largest digital library of free public domain eBooks, offering a vast collection of literature, philosophy, history, and poetry—completely free and legally accessible. Whether you're interested in classic novels, educational texts, famous speeches, or timeless stories, you'll find endless reading material at your fingertips. Top Features of Gutenberg Reader PRO ・ 100% Ad-Free Experience – Enjoy distraction-free reading with no ads ・ Unlimited eBook Downloads – Download books for offline reading anytime ・ Customizable Reading Experience – Adjust fonts, themes, colors, margins, and more ・ AUDIO: Text-to-Speech (TTS) Mode – Listen to your favorite books while reading along ・ Auto-Scrolling Mode – Hands-free reading without flipping pages ・ Full-Screen Mode – Distraction-free reading with an immersive experience ・ Bookmark, Highlight & Notes – Save quotes, mark passages, and take notes ・ Big & Bold Fonts – Ideal for easy readability and accessibility ・ Smart Resume Feature – Pick up reading right where you left off ・ Optimized for All Devices – Works smoothly on both phones and tablets Popular Free Books Available in Gutenberg Reader PRO Discover a vast collection of classic literature, novels, and timeless books, including: ・ Pride and Prejudice – Jane Austen ・ Alice's Adventures in Wonderland – Lewis Carroll ・ The Adventures of Tom Sawyer – Mark Twain ・ A Tale of Two Cities – Charles Dickens ・ The Importance of Being Earnest: A Trivial Comedy for Serious People – Oscar Wilde ・ The Yellow Wallpaper – Charlotte Perkins Gilman ・ Frankenstein – Mary Wollstonecraft Shelley ・ Adventures of Huckleberry Finn – Mark Twain ・ A Doll's House – Henrik Ibsen ・ Metamorphosis – Franz Kafka ・ The Adventures of Sherlock Holmes – Arthur Conan Doyle ・ Moby-Dick – Herman Melville ・ Dracula – Bram Stoker ・ Grimms' Fairy Tales – Jacob Grimm, Wilhelm Grimm ・ The Picture of Dorian Gray – Oscar Wilde ・ Great Expectations – Charles Dickens ・ Ulysses – James Joyce ・ Emma – Jane Austen ・ Heart of Darkness – Joseph Conrad ・ Jane Eyre: An Autobiography – Charlotte Brontë ・ The Count of Monte Cristo – Alexandre Dumas ・ Siddhartha – Hermann Hesse ・ Dubliners – James Joyce ・ Treasure Island – Robert Louis Stevenson ・ Les Misérables – Victor Hugo ・ Leviathan – Thomas Hobbes ・ Peter Pan – J.M. Barrie ・ Sense and Sensibility – Jane Austen ・ The Brothers Karamazov – Fyodor Dostoyevsky ・ Leaves of Grass – Walt Whitman ・ The Souls of Black Folk – W.E.B. Du Bois ・ Beyond Good and Evil – Friedrich Nietzsche ・ Wuthering Heights – Emily Brontë ・ A Study in Scarlet – Arthur Conan Doyle ・ Crime and Punishment – Fyodor Dostoyevsky …and thousands more free eBooks! Why Choose Gutenberg Reader PRO? With Gutenberg Reader PRO, you can carry a massive digital library of classic books, novels, and free eBooks wherever you go. Whether you love fiction, history, philosophy, poetry, or educational texts, this app gives you unlimited access to some of the greatest literary works of all time—without ads and completely free! Start Reading Today! Download Gutenberg Reader PRO now and explore the world’s greatest free eBook library. Whether you're a book lover, student, researcher, or casual reader, this app is your gateway to endless knowledge and literary adventures—all from the palm of your hand. Happy Reading!
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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
React Navigation
React Native Paper
AsyncStorage
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.
