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.
FieldCalc: The Smartest Way to Measure Land & Distances!
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for FieldCalc - GPS Area Measure: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Inaccurate GPS readings in dense urban areas
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited historical data management
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No option to customize measurement units
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Requires constant GPS access
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
FieldCalc: The Smartest Way to Measure Land & Distances! Need to measure your land, field, or yard? FieldCalc is your go-to GPS-based tool for precise area and distance calculations. Perfect for farmers, surveyors, real estate agents, or homeowners, it simplifies land measurement with precision and ease. ================== Ultimate Features for Reliable Measurements in FieldCalc! - GPS Field Area Measure: Easily measure the area of any land or property using GPS by selecting points on the map—ideal for fields, farms, plots, or construction sites with high accuracy. - Distance Tool: Quickly calculate the distance between multiple points on a map, perfect for measuring roads, walking paths, or planning routes with real-time tracking and precision. - Acreage Calculator: Convert measured land areas into acres, hectares, square meters, and other units effortlessly, making it easy to understand property sizes in your preferred format. - Map Drawing: Draw shapes or mark custom boundaries directly on satellite maps to visually outline plots, zones, or routes—perfect for planning, mapping, or real estate visualization. - Perimeter Measurement: Accurately calculate the total boundary length of any selected area or land parcel, helping you estimate fencing, piping, or irrigation needs with just a few taps. Advanced Features: - Circular Measurement: Measure circular or curved areas by placing radius points on the map, ideal for gardens, round fields, or tanks with a clean, circular layout and immediate results. - Area Subtraction: Subtract one area from another to find the usable land or unoccupied space, perfect for calculating excluded zones, buildings, or unmeasurable portions of land. - Satellite Compass: Use the built-in satellite compass to navigate your location on the map accurately, helping you orient yourself in large fields or unknown territories with confidence. - Speedometer: Track your movement speed in real time while measuring or walking land boundaries—helpful for monitoring pace, planning routes, or field surveying activities. ================== - Why Users Love It: 1. Simple Interface: Clean and easy-to-use design makes measurements fast and hassle-free. 2. Multiple Units Supported: Choose from acres, square feet, hectares, meters, and more. 3. Save & Share: Save your measurements and share them via email, text, or social media. 4. Professional Accuracy: Trusted by millions of surveyors, farmers, and contractors. ================== - Who Is It For? 1. Farmers planning crop fields or irrigation 2. Surveyors and property evaluators 3. Builders and real estate professionals 4. Hikers and adventurers mapping trails For anyone who needs quick, accurate land or distance measurements. ================== - Help & Support: Visit us at https://fieldcalc.app/contact-us ================== - Disclaimer: This app offers paid features that require an additional purchase for full access. To enjoy all the content and functionality, a subscription is required. Privacy Policy: https://fieldcalc.app/privacy-policy Terms of Use: https://fieldcalc.app/terms-of-use Join millions who trust FieldCalc for fast, reliable land measurements!
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.