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
Fireplace FX
Fireplace FX – The Ultimate Procedural Fireplace Simulator
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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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 included15 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 Fireplace FX: map the core Entertainment 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 a wider selection of fireplace styles and deeper customization features.
Assumption to check: Limited content variety and customization options
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to share their favorite fireplaces on social media.
Assumption to check: No social sharing features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a rating and review system for fireplaces.
Assumption to check: Lack of user feedback options
Validate with people who use this workflow before building.
Hypothesis 4
Offer a freemium model with additional features or content available through subscription.
Assumption to check: High price point for limited functionality
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
Fireplace FX – The Ultimate Procedural Fireplace Simulator Transform your screen into a mesmerizing, computer-generated fireplace with Fireplace FX! Enjoy the realistic ambiance of fire, complete with dancing flames, drifting smoke, and crackling sparks—all fully customizable to your liking. Whether you're looking to relax, set a cozy mood, or create the perfect fireplace experience on your Smart TV, Fireplace FX delivers an ultra-smooth, high-quality simulation like no other. Customize Your Fire Control the intensity, width, speed, granulation, luminance, noise, and flame size to shape the perfect fire. Adjust the color to create anything from a traditional warm glow to a more stylized effect. A built-in reset function lets you instantly restore the default settings. Realistic Sound Experience Fireplace FX features high-quality sound effects, perfectly synced to the fire’s movement, delivering an immersive experience whether you’re relaxing or setting the mood. Choose Your Background Pick from over 50 handcrafted backgrounds, including brick, stone, rustic, and modern textures to match your perfect setting. Expand the Experience Want to enjoy the fire on a larger screen? Simply mirror your device to a Smart TV via AirPlay and transform any room into a cozy space. Download Fireplace FX Today Whether you want a soothing fireplace for relaxation, a customizable fire for visual effects, or a realistic fire simulation to enjoy on your screen, Fireplace FX delivers a unique, fully interactive experience.
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
React Native
Expo
Supabase
Zustand
react-navigation
@supabase/supabase-js
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.
