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
Planimeter — Measure Land Area
Planimeter measures distances and land areas on maps.
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
2,215 ratings · Top 15%
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 Planimeter — Measure Land Area: map the core Productivity 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 manual point adjustment for precision.
Assumption to check: Limited measurement accuracy due to GPS inaccuracies
Validate with people who use this workflow before building.
Hypothesis 2
Add folders or tags for better organization.
Assumption to check: Difficulties in saving and organizing measurements
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a freemium model with basic features for free.
Assumption to check: High initial cost compared to competitors
Validate with people who use this workflow before building.
Hypothesis 4
Simplify UI and provide better guidance for first-time users.
Assumption to check: User interface can be cluttered
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
Planimeter measures distances and land areas on maps. Measure your outdoor projects - lawns, fences, paving, or anything else visible on the satellite map. Quickly measure lot sizes and buildings. Contractors can easily measure landscaping, paving, asphalt, flat roofs and more. Measure fields, circular regions, paths and perimeters. Add markers to pinpoint locations. “Planimeter is the essential distance mapping app.” — AppAdvice.com, Distance Mapping AppGuide Planimeter supports imperial and metric units. PRO SUBSCRIPTION An optional Pro subscription provides ongoing access to additional satellite map image providers. Subscription Terms • Payment will be charged to your Apple Account at confirmation of purchase • Subscription automatically renews unless canceled at least 24 hours before the end of the current period • Your account will be charged for renewal within 24 hours prior to the end of the current period • You can manage or cancel your subscription anytime in your App Store account settings Terms of Use: https://planimeter.io/terms Privacy Policy: https://planimeter.io/privacy
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
react-navigation
react-native-maps
expo-location
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.
