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
Spilled!
[TRY BEFORE YOU BUY] Try the first 3 zones for free, then unlock the full game with a single in-app purchase.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
403 ratings · Top 30%
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/
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 Spilled!: 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 rewarded ads that users can choose to watch for bonuses.
Assumption to check: Frequent ads can disrupt gameplay
Validate with people who use this workflow before building.
Hypothesis 2
Introduce more skins and power-ups for personalization.
Assumption to check: Limited customization options for characters/items
Validate with people who use this workflow before building.
Hypothesis 3
Add daily challenges and achievements to keep players engaged.
Assumption to check: Repetitive gameplay can lead to boredom
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate friend invites and multiplayer modes for social engagement.
Assumption to check: No social interaction 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
[TRY BEFORE YOU BUY] Try the first 3 zones for free, then unlock the full game with a single in-app purchase. Clean up ocean waste in this short & relaxing game! Recycle, earn coins, and upgrade your boat. Explore new areas. Find and rescue cute animals. Clean bigger spills and different kinds of waste! Features: - Around 1 hour of playtime. Come back to relax at any time using the level selector. - Clean up, recycle, earn coins, and upgrade your boat to tackle the next area. - 8 areas to move through, each bigger in size, with bigger oil spills and different kinds of waste. - Move through different biomes throughout the game. - Find and rescue 16 different animals throughout the game. About the developer: Hey! My name is Lente. I started working on Spilled! at the end of 2022. It is my first commercial release. I paused school and bought my own small boat to live on, which lowered my cost of living and allowed me to fully focus on Spilled! for a while. Once my savings ran out, I ran a successful Kickstarter, which kept me afloat all the way up until release! I am so happy I have been able to follow my dreams. I hope you like Spilled!
Written user reviews are not shown here. Check current App Store reviews >
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
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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.
