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
Hot Springs Story2
What lies beyond the bath curtain? A "hot" new entry into the hotel sim genre!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
82 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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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 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 Hot Springs Story2: map the core Games 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
Introduce diverse events or seasonal themes to enhance engagement.
Assumption to check: Limited content variety in gameplay
Validate with people who use this workflow before building.
Hypothesis 2
Implement more frequent rewards for player achievements.
Assumption to check: Pacing issues with progression
Validate with people who use this workflow before building.
Hypothesis 3
Offer more transparent benefits for premium purchases.
Assumption to check: In-app purchase fatigue
Validate with people who use this workflow before building.
Hypothesis 4
Create dynamic events or challenges to keep gameplay fresh.
Assumption to check: Repetitive tasks
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
What lies beyond the bath curtain? A "hot" new entry into the hotel sim genre! Features new baths exclusive to the sequel. Furnish your resort with Cauldron Baths, Footbaths, Open-Air Baths, and more. Create and customize your own world-famous hot springs resort. Entertain visitors with tons of facilities, including Ping Pong Tables, Stores, and Oil Drum Baths. Don't forget to provide first-class local cuisine! Thrill foodie guests with everything from humble Ramen Stalls to fancy Sushi Restaurants. Give your grounds a splash of color with decorative plants and watch the seasons change throughout the year. Baths also have a variety of effects, like relieving fatigue or promoting smooth, glowing skin. Placing a Beautician and Chocolatier near one of these baths will help you reel in guests who want to feel pampered. Help develop the local area by investing in different tourist attractions. Will you promote the Soothing Forest? A bustling Amusement Park? Maybe even an all-year round Ski Slope? Before you know it, you'll be booking tours for all kinds of visitors, from couples and families to ninjas and supermodels! The more guests you welcome, the more popular your resort will become. Hit the right targets, and travel guides will start featuring you in their rankings, too. Aim for the top and become the best 5-Star hot springs resort the world has ever seen! -- Zoom in or adjust the screen size with touch controls. Try searching for "Kairosoft" to see all of our games, or visit us at https://kairopark.jp. Be sure to check out both our free-to-play and our paid games! Follow us on Twitter for the latest Kairosoft news and information. https://twitter.com/kairokun2010
Written user reviews are not shown here. Check current App Store reviews >
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
Zustand
Supabase
react-native-reanimated
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.
