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
Call For Fire
welcome to call for fire, the mobile training simulation that teaches you how to call for fire and coordinate indirect artillery and mortar fire.
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
104 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Call For Fire: 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
Offer a free tier with basic missions to attract more users.
Assumption to check: Limited free content and features
Validate with people who use this workflow before building.
Hypothesis 2
Simplify onboarding with guided tutorials.
Assumption to check: Complex UI for new users
Validate with people who use this workflow before building.
Hypothesis 3
Integrate forums or chat for users to connect.
Assumption to check: Lack of community 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
welcome to call for fire, the mobile training simulation that teaches you how to call for fire and coordinate indirect artillery and mortar fire. this game will put you in an observation post and arm you with a radio enabling you to rain down hell on enemy armoured vehicles and personnel. this is not your typical shoot em up arcade game. call for fire is a training simulation built by soldiers for soldiers. it closely simulates what it is really like to call in indirect fires onto a target. the call for fire is based on the us jfire doctrine and will teach you how to coordinate artillery fire in a coalition environment. the game will enable you to learn the art of coordinating indirect fires utilizing both grid and polar missions. by playing this game you will learn: * correct ratel procedures for all stages of the call for fire * how to adjust fires onto line ot (observer target) * how to correctly bracket a target * how to send in a bda (battle damage assessment) this game is for you if: 1. you are a coalition soldier and are interested in perfecting your skills at calling for fire. 2. you are a military instructor or commander looking for a tool to teach your soldiers how to call for fire. 3. you are a soldier in training and want to get a competitive edge on your call for fire skills. 4. you are just interested in learning how soldiers call for fire on the battlefield.
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
Supabase
React Native Reanimated
Zustand
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.
