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
Invoice Maker - Easy & Fast
Invoice Maker - Easy & Fast
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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 included15 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 Invoice Maker - Easy & Fast: 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
Allow users to customize templates and styles.
Assumption to check: Limited customization options for invoices
Validate with people who use this workflow before building.
Hypothesis 2
Implement multi-currency functionality.
Assumption to check: No multi-currency support
Validate with people who use this workflow before building.
Hypothesis 3
Add PDF export and email options for invoices.
Assumption to check: Lack of export options
Validate with people who use this workflow before building.
Hypothesis 4
Introduce reminders and notifications for upcoming due dates.
Assumption to check: No reminders for due invoices
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
Invoice Maker - Easy & Fast. Create professional invoices anytime, anywhere — 100% offline, private, and secure. Perfect for freelancers, small businesses, and entrepreneurs who need a fast, simple, and reliable invoice maker app. No account, no sign-up, and no internet required. Key Features: • 100% Offline & Private: Your data stays on your device—no cloud storage, no external servers. • Instant Invoicing: Create professional invoices in seconds. • Multiple Currencies: Support for USD, EUR, GBP, CNY, JPY, and more. • Customizable Templates: Tailor your invoices to your needs. • Payment Tracking: Easily track the status of payments (Paid, Pending, Overdue). • Customer Management: Store and access customer information quickly. • Item Catalog: Maintain a catalog with pricing and use it in invoices. • Automatic Calculations: Subtotals, taxes, and discounts are calculated automatically. • Export to PDF: Generate invoices in PDF format and share via email or messaging apps. Business Insights: • Track Revenue: Monitor and analyze your income. • Customer Analytics: Understand customer spending patterns. • Reports: View detailed monthly, quarterly, and yearly reports. • Payment Overview: Get a clear view of unpaid, paid, and overdue invoices. • Visual Stats: View charts and statistics for better business insights. Privacy & Security: • No Internet Connection Needed: Keep your data secure and private. • No Account or Registration: Just open the app and start invoicing. • Data Privacy: No data collection, no tracking, and no external servers. User-Friendly: • Intuitive Interface: Simple and easy to use. • Quick Access: Save customer details and company profile for fast invoicing. • Automatic Invoice Numbering: Keep things organized without any hassle. • Preview Before Sending: Review invoices before finalizing. Perfect for: • Freelancers, small businesses, contractors, consultants, and any professional who needs a simple invoicing solution. • Those who prioritize privacy and offline functionality. Download Invoice Maker today and take control of your invoicing, privately and securely!
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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.
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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.
