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
Measuring Tape
This application measures the shortest (air) distance between point A and point B using GPS, with the maximum available accuracy
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
397 ratings · Top 30%
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 included13 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 Measuring Tape: 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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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 algorithms to improve measurement precision.
Assumption to check: Accuracy can be inconsistent depending on lighting and surface.
Validate with people who use this workflow before building.
Hypothesis 2
Add features like area and volume calculations.
Assumption to check: Limited features for advanced measuring tasks.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the user interface for managing saved data.
Assumption to check: Users report difficulty in saving and retrieving measurements.
Validate with people who use this workflow before building.
Hypothesis 4
Add social sharing options for measurements.
Assumption to check: No option for sharing measurements easily.
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
This application measures the shortest (air) distance between point A and point B using GPS, with the maximum available accuracy. Distances are displayed in yards, meters, kilometers, and miles. Simply reset the ruler at point A and watch the distance counters increase as you move toward point B—just like using a real tape measure or ruler. Primary uses for approximate sizing and measuring include: Land, grounds, and properties Real estate Golf course yardage Sports facilities and tracks Air distance Other outdoor measurements The application is intended for outdoor use only and requires location services to be enabled. How to use: Go to the starting point (A) and press the RESET button to initialize the distance counters. Walk to the target point (B) while watching the distance counters increase. The point A arrow continuously shows the direction back to the starting point. You can close the application at any time during a measurement. When reopened, the application will continue the current measurement.
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
expo-camera
react-native-async-storage
react-native-reanimated
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.
