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
Log Calculator
PROFESSIONAL FORESTRY & LUMBER CALCULATOR
$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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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/
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 Log Calculator: map the core Business 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
Include features for advanced users such as graphing capabilities or support for additional logarithmic bases.
Assumption to check: Lack of advanced features like graphing or multiple logarithmic bases
Validate with people who use this workflow before building.
Hypothesis 2
Implement a history feature to track previous calculations.
Assumption to check: No history of calculations for user reference
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize settings, such as enabling scientific notation.
Assumption to check: Limited user customization options
Validate with people who use this workflow before building.
Hypothesis 4
Add an onboarding guide or help section to assist new users.
Assumption to check: No clear onboarding or help section
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
PROFESSIONAL FORESTRY & LUMBER CALCULATOR Accurately calculate log board feet using the official New Brunswick Log Scale, Ontario Log Scale and Doyle Scale. Designed for forestry professionals, lumber mill operators, and wood buyers. KEY FEATURES: - New Brunswick Log Scale Calculator - Official NB scale table (3"-30" diameter, 8'-23' length) - Quick multi-diameter entry with undo - Automatic board feet calculation - Price per 1000 board feet valuation - Save calculations with custom labels - Firewood Calculator - Convert stack dimensions to cords - Multiple stack calculations - Price per cord valuation - Standard cord = 128 cubic feet - Saved Calculations - Store unlimited log entries - View historical calculations - Share via text, email, or save to files - Export calculation details - Professional Tools - Clean, intuitive interface - No ads or subscriptions - Offline functionality - Built-in help guide PERFECT FOR: Forestry professionals, lumber mill operators, log buyers, timber cruisers, firewood dealers, and anyone working with logs and lumber. ACCURATE & RELIABLE: Uses the official New Brunswick Log Scale standard for precise board foot calculations.
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
React Navigation
React Native Paper
Axios
BUILD KIT DIFFICULTY
Starter
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.
