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
The Ninth
Ninth is a comic reader for people who own their comics
$9.99
PRICE
$9.99
No in-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included
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 The Ninth: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Ninth is a comic reader for people who own their comics. It turns the files you already have into a library worth getting lost in — no account, no subscription, no lock-in. EVERY FORMAT THAT MATTERS CBZ, CBR, CB7, PDF, and fixed-layout EPUB, with embedded ComicInfo and ComicBookInfo metadata read straight from your files. A READER BUILT FOR COMICS Two-page spreads, right-to-left manga, vertical webtoons, page curl, and Live Text on any panel — copy, translate, even lift characters as stickers. Guided view walks the page panel by panel, with automatic detection and a built-in editor when a page deserves better. YOUR LIBRARY, ORGANIZED Series, creators, characters, and story arcs identified against the Grand Comics Database. Reading lists that span series, with gaps filled in and estimated reading time. Cover stacks, grids, and shelves; smart lists that stay current. SYNC WITHOUT A MIDDLEMAN Your library and progress sync privately through your own iCloud between iPhone, iPad, and Mac. Files live in your iCloud Drive — drop comics into the Ninth folder and they import on every device. BRING YOUR OWN CLOUD Browse and import from Dropbox, or connect OPDS, Komga, and Kavita servers — stream or download, with read progress synced back. EVEN PAPER COMICS Scan physical issues page by page with the built-in scanner — auto-straightened, tagged, filed like any other comic. LOCK WHAT'S YOURS Face ID or passcode in front of any comic, list, or collection. PRIVATE BY DESIGN No accounts, no ads, no tracking. See theninth.app/privacy. Comic metadata from the Grand Comics Database (comics.org), licensed under the GCD Data License / CC BY-SA 4.0. Ninth is not affiliated with or endorsed by the GCD.
Written user reviews are not shown here. Check current App Store reviews >
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
Implement advanced filtering and sorting options.
Assumption to check: Limited browsing options
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing and reading progress tracking.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Allow users 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
Incorporate user ratings and reviews for books.
Assumption to check: Poor user feedback mechanisms
Validate with people who use this workflow before building.
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
Zustand
React Navigation
TypeScript
Styled Components
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
