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
Timber Cruiser: Log Calculator
Still doing timber cruises with paper tally sheets and a hand calculator?
$4.99 · In-app purchases
PRICE
$4.99
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 included18 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 Timber Cruiser: 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
Expand calculator options to include advanced features like log taper calculations.
Assumption to check: Limited calculation methods for users with complex needs
Validate with people who use this workflow before building.
Hypothesis 2
Implement responsive design to ensure a uniform experience.
Assumption to check: Inconsistent user interface across different devices
Validate with people who use this workflow before building.
Hypothesis 3
Add user accounts to save and retrieve past calculations.
Assumption to check: Lack of user account features for tracking calculations
Validate with people who use this workflow before building.
Hypothesis 4
Provide a clear comparison of free vs. premium features to enhance conversion.
Assumption to check: Premium features not clearly defined
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
Still doing timber cruises with paper tally sheets and a hand calculator? Timber Cruiser brings your entire field toolkit to your iPhone — board feet calculations, species inventory, clinometer, compass, and PDF reports. All offline, all on one device. KEY FEATURES BOARD FEET CALCULATOR Instant volume estimates using the Doyle Log Rule. Enter DBH and log count — get board feet results in seconds. No manual lookup tables, no errors. CLINOMETER & COMPASS Measure tree heights and maintain accurate bearings without carrying extra gear. Built directly into the app for field-ready use. MULTI-SPECIES INVENTORY Track Pine, Oak, Walnut, Maple, Cherry, Ash and more. Set custom price-per-board-foot for each species and get real-time timber stand value estimates on the spot. VISUAL ANALYTICS Pie and bar charts show species distribution and volume breakdowns at a glance — so you can make informed decisions without leaving the field. PDF & CSV EXPORT Generate professional cruising reports to share with clients, landowners, or buyers. Export raw data as CSV for Excel analysis. WHY TIMBER CRUISER? 100% OFFLINE — works in remote areas with zero signal PRIVACY FIRST — no account, no cloud, no data leaks FIELD-READY — high-contrast interface for outdoor lighting BUILT FOR PROFESSIONALS — landowners, foresters, and loggers Download free and run your first timber cruise in under a minute.
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
react-navigation
axios
react-native-paper
expo-secure-store
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.
