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
Subnautica
*Make sure to check if your device is supported before playing Subnautica!*
$8.99 · In-app purchases
PRICE
$8.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.6
1,190 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.
First kit free with a verified email
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Combine features and design from your favorite apps.
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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included19 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 Subnautica: 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
Implement automated resource management features to assist players.
Assumption to check: Resource management can become tedious over time
Validate with people who use this workflow before building.
Hypothesis 2
Add a mini-map feature for easier navigation.
Assumption to check: Navigation can be confusing in large environments
Validate with people who use this workflow before building.
Hypothesis 3
Optimize graphics and resource usage for better performance.
Assumption to check: Some users report performance issues on older devices
Validate with people who use this workflow before building.
Hypothesis 4
Introduce multiplayer modes and sharing options for better engagement.
Assumption to check: Lack of social features like multiplayer or sharing
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
*Make sure to check if your device is supported before playing Subnautica!* Subnautica is an underwater adventure game set on an alien ocean planet. A massive, open world full of wonder and peril awaits you! Descend into the depths, craft equipment, pilot submarines and out-smart wildlife to explore lush coral reefs, volcanoes, cave systems, and more - all while trying to survive. Unravel the mystery of this world teeming with creatures, both friendly and hostile, scattered with clues from a previous time. Play in Survival mode to experience the original challenge, or switch to Freedom or Creative mode to discover this oceanic planet without the pressures of thirst, hunger, or oxygen. FEATURES • SURVIVE - After crash landing on a vast underwater planet, the clock is ticking to find water, food, and to develop the equipment you need to explore. • EXPLORE - Manage your hunger, thirst, and oxygen supply as you dive into towering kelp forests, sunlit plateaus, bio-luminescent reefs, and winding cave systems. • SCAVENGE - Collect resources from the ocean around you. Venture deeper and further to find rarer resources, allowing you to craft more advanced items. • CRAFT - Build bases to shelter in, vehicles to pilot, tools for survival to aid you in navigating and adapting to this subaquatic landscape. • DISCOVER - What happened to this planet? What caused you to crash? Can you find a way to make it off the planet alive? • CUSTOMIZE - Play in Survival mode to experience the original challenge, or switch to Freedom or Creative mode to discover this oceanic planet without the pressures of thirst, hunger, or oxygen. CAREFULLY REDESIGNED FOR MOBILE • Revamped interface – exclusive mobile UI with complete touch control • Game Center achievements • Cloud Save – Share your progress between iOS devices • Compatible with MFi controllers • iPhone 16 Optimization (including Pro Max) ----- *DEVICES NOT SUPPORTED (THE GAME WON'T WORK)*: - iPhone Xr, iPhone SE Gen 2 (2020) - iPad Mini Gen 5, iPad Air Gen 3, iPad Gen 8, iPad Gen 9 *SUPPORTED DEVICES ON LOW RESOLUTION ONLY*: - iPhone Xs, iPhone Xs Max, iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone 12, iPhone 12 Mini, iPhone 13, iPhone 13 Mini, iPhone SE Gen 3 (2022) - iPad Pro 10.5", iPad Mini Gen 6, iPad Air Gen 4, iPad Gen 10, iPad Pro 11" Gen 1, iPad Pro 12.9" Gen 3 *SUPPORTED DEVICES* : - iPhone 12 Pro, iPhone 12 Pro Max, iPhone 13 Pro, iPhone 13 Pro Max, iPhone 14 AND ABOVE - iPad Pro 11" Gen 2, iPad Pro 12.9" Gen 4, iPad Air Gen 5, iPad Pro 11" Gen 3, iPad Pro 11" Gen 4, iPad Pro 12.9" Gen 5, iPad Pro 12.9" Gen 6 AND ABOVE
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 Navigation
Expo Location
React Native Reanimated
Async Storage
Three.js for React Native
React Native Gesture Handler
BUILD KIT DIFFICULTY
Advanced
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.
