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
Epub Reader with AI -Books Pro
Jump into a world of endless reading with Books Pro! It's the eBook reader that handles all kinds of file formats, making sure you get the most out of every reading session
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
7 ratings · Top 5%
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 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 Epub Reader with AI -Books Pro: 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
Allow users to personalize their reading experience with themes and font adjustments.
Assumption to check: Limited customization options for reading settings
Validate with people who use this workflow before building.
Hypothesis 2
Implement sharing options for favorite books and AI summaries.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Expand support for additional eBook formats beyond ePub.
Assumption to check: Minimal support for various eBook formats
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the subscription process and provide clear upgrade paths.
Assumption to check: Complicated subscription management
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
Jump into a world of endless reading with Books Pro! It's the eBook reader that handles all kinds of file formats, making sure you get the most out of every reading session. Whether you're learning something new or just enjoying a good story, Books Pro's got you covered. Happy reading! Supported Formats: - Text, Books and Documents: ePub Document (.epub), PDF Document (.pdf), Plain Text Document (.txt), Pages (.pages), Numbers (.numbers), Keynote (.key), HTML (.html), Markdown files (.md), Tex Document (.tex), TrueType Collection Font (.ttc), TrueType Font (.ttf), XLS (Excel files) (.xls), PPT (PowerPoint files) (.ppt), PPTX (PowerPoint files) (.pptx), XLSX (Excel files) (.xlsx), Zip Archive (.zip), RTFD Document (.rtfd), Plain Text Document (.txt), Microsoft Word document (.doc, .docx), RTF Document (.rtf) - Video: MP4 (.mp4), iTunes video (.m4v), H.264 Images, 3GPP (.3gp), 3GPP2 (.3g2), QuickTime movie (.mov) - Audio: MP3 (.mp3), AC-3 audio, AIFC audio (.aifc), AIFF audio (.aiff), AMR Audio (.amr), Sun/NeXT audio (.au), Enhanced AC-3, Apple m4a (.m4a), Core Audio, WAVE audio (.wav) - Images: HEIC (.heic), Adobe DNG (.dng), HEIF (.heif), Image File (includes .png, .jpg, .jpeg, .jpeg-2000), SVG Document (.svg) Main Features: - It's not just about reading; you can write and edit too! With Books Pro, easily edit documents right in the app in formats such as PDF, TXT, RTF, TeX, Markdown, and HTML. - Import and Export Ease: Directly import files from and export to various cloud services like iCloud Drive, Google Drive, Dropbox, and more. - Customizable Reading: Choose from multiple themes (dark, light, sepia) and font sizes. Enjoy text-to-speech in ePub and PDF files for a hands-free experience. - Interactive Annotations: Utilize the powerful PDF engine for extensive documents, including form fill-ins. Annotate, highlight, and insert text or images in your eBooks. - AI-Powered Assistance: Leverage the AI Assistant for summaries, translations, and even engaging discussions about your reading material. - Organization and Personalization: Manage your library with customizable folders, subfolders, and book covers. Privacy Policy http://www.noteswriter.com/Kairoos_Privacy_Policy.html EULA https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ This app requires users to have a subscription to unlock all the features after a 3-day risk-free trial.
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
Supabase
Zustand
React Navigation
React Native Reanimated
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.
