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
Manga UP!
Read "Fullmetal Alchemist", "Toilet-bound Hanako-kun", "Smoking Behind the Supermarket with You", and MORE on SQUARE ENIX's official "Manga UP!" app!
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
2,604 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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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 Manga UP!: 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
Read "Fullmetal Alchemist", "Toilet-bound Hanako-kun", "Smoking Behind the Supermarket with You", and MORE on SQUARE ENIX's official "Manga UP!" app! FREE TO READ Log in daily to unlock free chapters—no rental limits! TRY PREMIUM FREE FOR ONE MONTH VAULT PASS subscription unlocks 30,000+ chapters instantly—perfect for binge readers! Access entire completed hits like "My Dress-Up Darling", "Horimiya", and "Soul Eater"! SIMULPUBS – LATEST CHAPTERS SAME DAY AS JAPAN Be the first to read the newest chapters of "The Apothecary Diaries", "Daemons of the Shadow Realm", "Assassin & Cinderella" and more! DISCOVER NEW SERIES 400+ manga across Isekai, Shonen, Romance, Fantasy, Shojo, Josei and Anime Tie-ins. Go beyond the mainstream and dive into hidden gems! SUPPORT CREATORS Manga UP! is the official service run by the publisher, SQUARE ENIX. All contents on this app are protected under the law and profits are legally distributed to authors. ■Official X (Twitter) account @MangaUpGlobal ■WEB version https://global.manga-up.com NOTICE If images are not displaying, please try restarting your device. Data charges may apply when using mobile networks. Series availability may change without notice. - Privacy Policy https://weblet.square-enix.com/geojmp.php?d=DOCUMENTS&l=privacy - Terms of Service https://global-api.manga-up.com/webview/rule_ios
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
Expand the library with more titles and genres.
Assumption to check: Limited manga titles compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize loading performance for a smoother experience.
Assumption to check: Inconsistent loading times when accessing manga.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription tiers and provide clearer value propositions.
Assumption to check: Subscription model can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Improve offline reading features for better accessibility.
Assumption to check: Limited offline capabilities.
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
Zustand
React Navigation
react-native-reanimated
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.
