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
QR Code Master: Scan & Maker
Experience the Ultimate QR & Barcode Toolkit
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
1,908 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 QR Code Master: Scan & Maker: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Experience the Ultimate QR & Barcode Toolkit Stop wasting time with slow or unreliable scanners. QR Code Master is engineered for peak performance, providing instant results even with damaged codes, small labels, or in low-light environments. Whether you’re at a restaurant, in a warehouse, or at home, get the information you need immediately. WHY QR CODE MASTER? • LIGHTNING FAST: Point and scan. Our optimized engine recognizes codes instantly without the need for manual focus. • WIFI CONNECT: Scan a code at a cafe or a friend's house to join the network instantly without typing long, complex passwords. • SMART CREATOR: Generate custom, high-resolution QR codes for Website URLs, Text, and digital Business Cards (vCard) in seconds. • PRIVATE & SECURE: Your privacy is our priority. Scan history stays on your device—we never track or store what you scan. • BATCH MODE: Perfect for inventory, logistics, or shopping. Scan multiple barcodes in a row and easily review the results. POWERFUL FEATURES FOR EVERYONE: • History Log: Never lose an important link again. Automatically save all your scans in an organized, easy-to-search list. • Flashlight Support: Scan reliably in dark rooms, dim restaurants, or outdoors at night with built-in light support. • Gallery Scan: Found a code in your photos? Import images directly from your Camera Roll to decode them instantly. • All-Format Support: Reads QR, Barcode, Data Matrix, Aztec, UPC, EAN, Code 39, and more. GO PRO FOR THE FULL EXPERIENCE: Upgrade to our premium subscription to unlock: • Unlimited scanning and unlimited history storage. • Advanced QR templates and custom creation options. • Ad-free experience for a cleaner, faster workflow. • Priority support and regular feature updates. Simple. Powerful. Master. Download now and start scanning! Terms and Conditions: https://qr-code-master.com/terms Privacy Policy: https://qr-code-master.com/privacy EULA: https://qr-fun.com/eula/
Written user reviews are not shown here. Check current App Store reviews >
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 QR code colors and add logos.
Assumption to check: Limited customization options for QR codes
Validate with people who use this workflow before building.
Hypothesis 2
Enable QR code scanning and history access without internet.
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 3
Offer an ad-free premium subscription with additional features.
Assumption to check: Ads can be intrusive
Validate with people who use this workflow before building.
Hypothesis 4
Integrate easy sharing options for scanned codes directly from the app.
Assumption to check: Lack of sharing options
Validate with people who use this workflow before building.
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-qrcode-svg
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.
