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
ARS FOG
The ARS Technical Rescue Instructor Field Guide puts essential rescue reference material and field calculators in your pocket
$9.99 · In-app purchases
PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
12 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'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 ARS FOG: map the core Reference 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 a clearer navigation structure to reduce confusion.
Assumption to check: Users may find it difficult to navigate between different data types (fog data and plans).
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add more details and settings to their plans.
Assumption to check: Limited customization for emergency plans may frustrate users.
Validate with people who use this workflow before building.
Hypothesis 3
Provide tutorials or explanations for fog data terms.
Assumption to check: Some users may struggle with understanding fog data metrics.
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline capabilities for users to access data without internet.
Assumption to check: The app may lack offline 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
The ARS Technical Rescue Instructor Field Guide puts essential rescue reference material and field calculators in your pocket. FIELD GUIDE Browse the complete ARS Instructor Field Guide with pinch-to-zoom, full-text search, and a structured table of contents. Quickly navigate to any of the 250+ pages covering structural collapse, trench rescue, rope systems, confined space, hazmat response, and more. FIELD CALCULATORS 20+ purpose-built calculators designed for technical rescue operations: - Buttress Shore, Raker Length, and Shore Spacing - Wood Shore Build List and Shore Length - Fall Factor and Two-Point Anchor - Collapse Weight, Weight Estimators, and Fallen Tree Weight - LEL Conversion, Confined Space Air Exchange, and Dewatering - A-Frame Gantry, Pipe Flow, Friction Loss, and more Calculators are linked directly to related field guide pages for fast cross-reference. QUICK-ACCESS RESOURCES Emergency contacts for ChemTrec and Poison Control, links to ERGs, HazMat references, and maps — all one tap away. Built by Advanced Rescue Solutions, trusted by 5,000+ rescue professionals.
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
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.
