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
SIMULACRA
"WINNER, Best Mobile Game" - Indie Prize USA 2018
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
5,174 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 SIMULACRA: 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 branching storylines for more player agency.
Assumption to check: Limited exploration of the narrative leads to frustration.
Validate with people who use this workflow before building.
Hypothesis 2
Optimize graphics and loading times.
Assumption to check: Some users report performance issues on older devices.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify UI and enhance onboarding.
Assumption to check: Confusing user interface in certain sections.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options and leaderboards.
Assumption to check: Lack of social features for sharing experiences.
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
"WINNER, Best Mobile Game" - Indie Prize USA 2018 “WINNER, Excellence in Storytelling” - International Mobile Game Awards SEA "Simulacra expands upon its predecessor, Sara is Missing, experimenting even further with unsettling horror. And it succeeds." 9/10 - Pocket Gamer You found the lost phone of a woman named Anna. In it, you see a desperate cry for help in the form of a video message. The phone behaves strangely as you dive deeper into it. You talk to her friends and they have no idea where she is. Her texts, emails and photo gallery provides fragments of information. It's up to you to piece it together. About the Game: SIMULACRA is an immersive narrative thriller using the interface of a mobile phone. Like all phones, you have messages, emails, gallery and all kinds of apps to look through. With a strong focus on realism, the game's characters are played by live actors and shot at real locations. Dive into Anna's life as you look at her private photos, go through her dating app or view her personal video logs. Features: - Explore a fully realised world through the lens of a mobile phone. - Enjoy a unique gameplay experience through popular phone apps, including a dating app, a social media app and a web browser. - An expansive narrative with hours of gameplay that leads to 5 possible endings. - Filmed with live actors and an extensive VO cast. - Solve the recurring image and text decryption puzzles to learn more about Anna’s story.
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-navigation
@supabase/supabase-js
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.
