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
Tape Measure Calculator Pro
**Featured in Crate and Barrel's Home Catalog**
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.8
2,225 ratings · Top 5%
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 included16 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 Tape Measure Calculator Pro: 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 calibration features to improve measurement accuracy.
Assumption to check: Accuracy of measurements can vary based on camera quality
Validate with people who use this workflow before building.
Hypothesis 2
Add advanced measuring tools and features for enhanced user experience.
Assumption to check: Limited functionality beyond basic measurements
Validate with people who use this workflow before building.
Hypothesis 3
Provide clear explanations and benefits for each subscription tier.
Assumption to check: In-app purchases may be confusing to users
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the UI by reducing elements and enhancing user guidance.
Assumption to check: User interface can feel 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
**Featured in Crate and Barrel's Home Catalog** Ever need to do math while using a tape measure? What is 25 3/8" ÷ 3, BUT on a measuring tape? Skip the math, converting to fractions, and go right to the answer on the tape!! Saves you time and costly mistakes on material! * Quick measurement calculations, right on a visual tape measure!! No need to guess where to place your mark!! * Ability to add, subtract, multiply, divide multiple measurements. Mix decimals and fractions too! * Results are given back to you in inches, feet, and centimeters, in both decimal and fractions...no more conversion after the fact! * In a pinch without your tape measure? Tapeulator comes with a measuring feature that will help you get a measurement in a bind * Great for wood work, metal work calculations! Pipe cutters love our App! Tapeulator is perfect for do it yourselfers and the pros. Don't just take our word for it, check out some recent reviews from others: - "My business is home remodeling, I use this app at least a couple of times a day. Makes the math a lot simpler, saves time. Thanks for a great product." - App Store Review, USA - "Tapeulator = Awesome! - You don't realize how much time you can save and how much frustration you can avoid by using this app." - App Store Review, USA - "This little gem saved me a decent amount of money by making it easy to double check my work before cutting. Highly recommended. Measure twice, cut once!" - App Store Review, Canada - "Excellent app!!!!! Makes us average guys a real pro!!! Eliminates tape measure guess work...I recommend it for everyone!!!" - App Store Review, USA
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/async-storage
Zustand
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.
