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
K MANGA
==K MANGA-Manga & Comics==
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
2,918 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for K MANGA: 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
==K MANGA-Manga & Comics== Welcome to K MANGA - the official Kodansha manga app where you can dive into your favorite Kodansha titles every day. With K MANGA, you can immerse yourself in renowned titles such as 'Attack on Titan', 'Ghost in the Shell', 'Fairy Tail', 'Hajime no Ippo: The Fighting Spirits', 'Tokyo Revengers', and many more. Enjoy reading popular manga, ongoing series available simultaneously in Japan and the US, or explore new original series on K MANGA right from your phone or tablet. Dive into a new story whenever you like. Show your support for your favorite authors by reading the titles through official releases. Why K MANGA? - Access to a vast collection of over 500 titles from Kodansha’s Manga Catalog - More than 60 original manga series available the moment they are published in Japan - Discover fresh stories from your favorite titles, original series, and continuously added new titles - Read a new chapter for free every day - Encompasses a wide range of genres from Action, Romance, Sports, Isekai, Suspense, Drama, Fantasy, and more - Official service that supports your favorite authors Explore Famous Kodansha Manga: - 'Attack on Titan' - 'Ghost in the Shell' - 'Fairy Tail' - 'Hajime no Ippo: The Fighting Spirits' - 'Tokyo Revengers' - 'Initial D' Discover K MANGA Original Series Simulpubbed with Japan: - 'Don’t Toy With Me, Miss Nagatoro' - 'The Fragrant Flower Blooms with Dignity' - 'WIND BREAKER' - 'As a Reincarnated Aristocrat, I’ll Use My Appraisal Skill to Rise in the World' - 'Alya Sometimes Hides Her Feelings in Russian' Explore a diverse array of genres including Action, Romance, Sports, Isekai, Suspense, Outlaws, Drama, Fantasy, Slice of Life, Shojo, and more. If you're a fan of K MANGA or curious about our latest titles, follow us on X: [https://twitter.com/KMANGA_KODANSHA] - Stay updated on our releases and exciting news!
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
Offer more free chapters or previews.
Assumption to check: Limited free content compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize backend calls for faster content delivery.
Assumption to check: Inconsistent loading times for manga chapters
Validate with people who use this workflow before building.
Hypothesis 3
Streamline navigation and reduce clutter for a cleaner look.
Assumption to check: User interface can be cluttered with too many options
Validate with people who use this workflow before building.
Hypothesis 4
Implement better organization features for offline content.
Assumption to check: Difficulties in managing downloaded content
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
Supabase
React Navigation
Axios
Zustand
BUILD KIT DIFFICULTY
Expert
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.
