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
PDF Cuno-Maker&Viewer
Why Choose PDF Cuno?
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.8
6 ratings · Top 50%
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 PDF Cuno-Maker&Viewer: map the core Graphics & Design 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 advanced editing tools such as annotations and signatures.
Assumption to check: Limited editing features compared to full PDF editors
Validate with people who use this workflow before building.
Hypothesis 2
Optimize PDF rendering and memory management for larger files.
Assumption to check: Occasional crashes when handling large PDF files
Validate with people who use this workflow before building.
Hypothesis 3
Add cloud storage options for saving and accessing PDFs.
Assumption to check: No cloud storage integration
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to share and collaborate on PDFs in real-time.
Assumption to check: Lack of collaboration features
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
Why Choose PDF Cuno? PDF Cuno makes creating and sharing PDFs easier than ever. Whether you need to convert text, merge pictures, or turn your creative doodles into a shareable format, PDF Cuno has you covered. The app helps you handle all your PDF needs with speed and simplicity, ensuring that you stay productive and efficient. App Features - Text to PDF: Quickly convert any text, such as notes, articles, or reports, into a polished PDF. You can easily convert your ideas into a clean, professional-looking PDF format, perfect for sharing or storing. - Picture to PDF: With just a tap, you can merge multiple images—whether photos, screenshots, or scanned pictures—into a single, compact PDF file. This feature is ideal for compiling your images into one easy-to-share file. - Doodle to PDF: Turn your sketches and freehand drawings into high-quality PDFs instantly. Whether you're an artist or just doodling for fun, you can share your creative ideas in a polished PDF format with just a tap.
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
Redux
react-native-pdf
@react-native-community/slider
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.
