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
Gunther's Library for Stardew
Whether you're a seasoned farmer or just starting out, this comprehensive Stardew Valley companion app is designed to be your guide to tracking progress, planning efficiently, and helps you unlock every secret the val...
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 5.0
343 ratings · Top 5%
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 included17 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 Gunther's Library for Stardew: map the core Reference 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
Provide more in-depth descriptions and stats for items.
Assumption to check: Limited item detail information compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline caching for better accessibility.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to personalize their collections and settings.
Assumption to check: No user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Offer more enticing premium features to increase conversion.
Assumption to check: In-app purchase limitations
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
Whether you're a seasoned farmer or just starting out, this comprehensive Stardew Valley companion app is designed to be your guide to tracking progress, planning efficiently, and helps you unlock every secret the valley has to offer. - Complete Item Database Instant access to details and checklists for everything in the game: Shipped Items, Fish, Artifacts, Minerals, Cooking & Crafting Recipes, Furniture, Buildings, Shops, Clothing, Weapons, Tools, Villagers, Monsters, Pets, and Farm Animals. - Perfection & Collection Trackers Track everything you’ve acquired and see what’s left to reach 100% completion. - Villager Gift Tastes & Schedules Never miss a birthday or a chance to boost friendship—view accurate daily schedules for every character. - Community Center & Joja Guide Bundle checklist and Joja route planning at your fingertips. - Golden Walnut Checklist Hunt down every last Golden Walnut on Ginger Island with ease. - Building & Upgrade Info Plan your farm layout with complete data on all buildings and upgrades. - Forge & Enchantments Guide Master the Volcano Forge with a breakdown of all weapon and tool enchantments. - Achievements List Browse and track every in-game achievement as you complete them. - Skills Tracker Track your skill progress and view unlocks for every level. - Custom Notes, To-Do List & Calendar Plan your seasons with personal notes, a fully editable calendar, and daily to-do lists. - Multiple Farm Support Manage and track progress across all your farms. - Global Search Quickly find any item, villager, or topic in seconds. - Offline & Private Works entirely offline—no internet required and no data is ever collected, stored, or sent anywhere. Your privacy is fully protected. - 100% Free with NO Ads! The only in-app purchases are for tipping the Developer. - Available in 12 languages! English, Deutsch, Español, Français, Magyar, Italiano, 日本語, 한국어, Português, Русский, Türkçe, 中文 Your journey to Perfection just got easier. Download now and make every day in Stardew Valley count with this full-featured guide for SV!
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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
Supabase
Zustand
react-native-paper
BUILD KIT DIFFICULTY
Intermediate
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.
