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.
Booklover is a highly responsive and robust eBook reader
$3.99 · 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.
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Combine features and design from your favorite apps.
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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 Booklover - eBook Reader: 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 book discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Subscription complexity
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User account management issues
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent reading experience across devices
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.
Booklover is a highly responsive and robust eBook reader. It excels at handling PDFs, manga, and scanned books. The metadata-driven library management system makes it easy to organize and enjoy a large collection of books in PDF, ZIP/CBZ, and RAR/CBR formats. Seamlessly integrated with iCloud Drive, books in the iCloud Drive/Booklover folder automatically appear in the app’s library and can be downloaded on demand. In the library, you can organize books by genres and arrange them using various bibliographic details such as title, author, publisher, and more. With the search field and powerful Library Navigator, you can quickly locate a book among thousands in your collection. Customize your reading experience with settings for each book, including page layout, transition axis and style, cropping, filters, progress direction, background, and more. Booklover supports bookmarks with titles and notes, as well as PDF text annotations (highlights), text search, and a table of contents. Main Features: # General • Manage and view eBooks (PDF, ZIP/CBZ, RAR/CBR) • Support for archived image files in JPG, PNG, GIF, HEIF, WEBP, AVIF, and JPEG XL formats • Automatic syncing of book files placed in iCloud Drive/Booklover. On-demand caching (download) of the remote files • Import files via iTunes (Windows), Finder (Mac), AirDrop, Drag & Drop, "Open with..." etc. • Import files via apps from various cloud storage services, such as Dropbox and OneDrive, as well as other services accessible through the iOS Files app. • Slide Over / Split View (iPad) • Hardware keyboard support (mainly in the reader) # Library • Section books by genre (ON/OFF) • The Library Navigator (ON/OFF) • Histories of added and opened books • Context Menu for individual books (long-press a book cover) • Change sort order: By Title, Author, Publisher, Filename, Added Date, etc. • Alphanumeric Index Labels (ON/OFF) • Toggle display of cover accessories • Adjust cover grid size • Responsive Shadow (shows page volume with shadow) • Filter books by Status, Genre, Tags, etc. • Search books by various bibliographic details, file name, and tags # Reader • PDF text annotations (highlights) with notes, text search, and a table of contents • Bookmarks with titles and notes • Lists of bookmarks and PDF annotations • Page transition settings: Axis (Horizontal, Vertical), Style (Scroll, Continuous Scroll, Stack, Crossfade, Zoom fade, Instant) • Progress direction setting: Left to Right, Right to Left (for vertical text, manga, Arabic, etc.) • Page layout setting: Automatic, Single-Page, Two-Pages (spread) • Separate page layout settings for view orientation (Portrait / Landscape) • Page trimming (for images only) • Page sizing: Show All, Width-Fit, Height-Fit • Page thumbnail view (overview, bookmarks) • Image correction filters • Dynamic background (When the "Background Color" option for a book is set to "Dynamic") • Adjust page spread position (Insert adjuster page at the beginning of the book body) • Text recognition within images (with compatible devices only) • Export (share) the currently displayed page # Book Management • Edit metadata: Title, Author, Genre, Publisher, Published Date, ISBN, etc. • Edit Tags (Can be used as filter criteria in the side menu) • Extract metadata (title/author) from PDFs • Extract various metadata from file names with configurable extraction rules • Automatic/Manual cropping of book covers • Batch modification of book settings and metadata • Transfer book files: "Open with...", AirDrop, Drag & Drop, etc. • Can manage the content files and data separately ("Ghost Book") ——————————————— # Acknowledgments [Books used in the screenshots] • "Give My Regards to Black Jack" by SHUHO SATO (Manga on Web: http://mangaonweb.com) • Public domain books from Feedbooks (http://www.feedbooks.com) • Public domain comics from digitalcomicmuseum.com (http://digitalcomicmuseum.com)
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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.