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
Window Cleaning Estimator
Transform your window cleaning business with "Window Cleaning Estimator," the ultimate app designed by window cleaners, for window cleaners
$7.99 · In-app purchases
PRICE
$7.99
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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What's included14 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 Window Cleaning Estimator: 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
Include tooltips or a tutorial to guide first-time users.
Assumption to check: Limited user guidance on how to use estimation features
Validate with people who use this workflow before building.
Hypothesis 2
Implement a verification feature to confirm estimates.
Assumption to check: Potential inaccuracy in estimates based on user input
Validate with people who use this workflow before building.
Hypothesis 3
Provide options for users to customize their estimates based on additional services.
Assumption to check: Lack of customization options for cleaning services
Validate with people who use this workflow before building.
Hypothesis 4
Add a review system for users to share their experiences.
Assumption to check: No user reviews or testimonials to validate service quality
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
Transform your window cleaning business with "Window Cleaning Estimator," the ultimate app designed by window cleaners, for window cleaners. This user-friendly app eliminates the need for monthly fees, putting robust tools right in your pocket without ongoing costs. Key features include: • Instant Estimates & Invoices: Generate accurate estimates, detailed invoices, and receipts on-the-go. • Customer Data Management: Easily save and retrieve customer profiles to streamline your operations. • Custom Window Counters: Tailor the app with custom counters for precise estimate calculations. • Flexible Pricing Options: Set taxes and discounts directly within the app to reflect real-world charges accurately. • Multiple Currencies: Conduct business globally with support for various currencies. • Personalized Business Details: Add your company logo, details. • Offline Capability: Access all features offline, ensuring you can manage your business without an internet connection. • Dedicated Support: Have a question or an idea for a new feature? Contact us directly through the app!
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
@react-native-async-storage/async-storage
react-native-paper
TypeScript
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.
