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
The Past Within
Note: The Past Within is a co-op only game
$2.99 · In-app purchases
OVERALL US RANK
#81
Paid · all categories
REVENUE (Est)
$134K/mo
$74K - $194K
RATING
★ 4.9
7,263 ratings · Top 5%
Evidence scope: #81 is the current overall US Paid chart position. 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 The Past Within: 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
Provide hints or easier versions of puzzles for casual players.
Assumption to check: Some puzzles can feel too obscure or difficult to solve
Validate with people who use this workflow before building.
Hypothesis 2
Introduce time-limited events or new puzzles to keep users engaged.
Assumption to check: Limited replayability after completing chapters
Validate with people who use this workflow before building.
Hypothesis 3
Implement thorough testing and user feedback loops to quickly address any issues.
Assumption to check: Some users report bugs during puzzle interactions
Validate with people who use this workflow before building.
Hypothesis 4
Clearly outline benefits of purchases and offer trial periods for premium content.
Assumption to check: In-app purchases may confuse users regarding value
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
Note: The Past Within is a co-op only game. Both players need to own a copy of the game on their own device (mobile, tablet or computer), as well as a way to communicate with each other. Play together with a friend or find a partner on our official Discord server! The past and future cannot be explored alone! Team up with a friend and piece together the mysteries surrounding Albert Vanderboom. Communicate what you see around you to help one another solve various puzzles and explore the worlds from different perspectives! The Past Within is the first co-op only point-and-click adventure set in the mysterious world of Rusty Lake. Features: ▪ A co-op experience Play together with a friend, one in The Past, the other in The Future. Work together to solve the puzzles and help Rose set her father’s plan in motion! ▪ Two worlds - Two perspectives Both players will experience their environments in two different dimensions: 2D as well as in 3D - a first-time experience in the Rusty Lake universe! ▪ Cross-platform As long as you can communicate with each other, you and your partner of choice can each play The Past Within on your preferred platform: Mac, PC and Nintendo Switch! ▪ Playtime & Replayability The game contains 2 chapters and has an average play-time of 2 hours. For the full experience, we recommend replaying the game from the other perspective. Plus you can use our replayability feature for a fresh start with new solutions to all puzzles.
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
Supabase
Zustand
React Navigation
React Native Reanimated
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.
