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
Yatagarasu
YATAGARASU, THE HUNTER'S COMPANION
$2.99 · In-app purchases
PRICE
$2.99
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's included16 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 Yatagarasu: map the core Entertainment 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
Enhance content recommendation algorithms and allow user-generated lists.
Assumption to check: Limited content discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Implement comprehensive offline download options.
Assumption to check: Lack of offline capabilities for all content
Validate with people who use this workflow before building.
Hypothesis 3
Focus on modern UI trends and improve navigation.
Assumption to check: Poor user interface design
Validate with people who use this workflow before building.
Hypothesis 4
Introduce advanced parental control settings for user accounts.
Assumption to check: Limited parental control features
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
YATAGARASU, THE HUNTER'S COMPANION Yatagarasu (Yata for short) is the all-in-one companion app for the Monster Hunter Wilds community. Plan your gear, find a squad, roll today's hunt, and stay connected with friends between sessions. Fan-made, no ads, no trackers. BUILD SMARTER , Full build planner across weapons, armor, decorations and talismans , One-tap Set Optimizer that solves for the skills and slots you actually want , Save unlimited loadouts and share builds with friends as a code or PNG , Searchable compendium covering every weapon, armor set, skill and monster PLAY TOGETHER , LFG board, post or join hunts, filter by quest, rank or weapon , 4-hunter Parties with real-time chat, random hunt rolling, party votes and invites , LFG, or queue in matchmaker and be pair in seconds , Random Rolling Hunts to keep the grind fresh CHAT THAT KEEPS UP , World chat plus six regional rooms (NA, EU, ASIA, JP, OCE, SA) , Guild chat for your hunting circle , Direct messages with read receipts YOUR HUNTER, YOUR CARD , Public Guildcard with your 8-character Hunter ID , Custom themes, animated effects, halos and chat banners , Daily check-in streaks and XP rewards , In-app shop, earn cosmetics through play BUILT FOR THE COMMUNITY , Add friends by Hunter ID or Discord @username , Push notifications for party invites, DMs and friend requests , Privacy-first, no third-party analytics, no ads, no location data , Open Discord support and a hunter-driven roadmap Yatagarasu is a fan project. We are not affiliated with, endorsed by or sponsored by Capcom or the Monster Hunter franchise. All trademarks belong to their respective owners. Visit yatagarasu.online Support and feedback, discord.gg/yatagarasu
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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
axios
react-native-video
Zustand
@react-navigation/native
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.
