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
Lexy PDF Viewer-Maker,Builder
Lexy PDF Viewer is the go-to PDF application that combines simplicity, utility, and versatility
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.5
154 ratings · Top 15%
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 included17 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 Lexy PDF Viewer-Maker,Builder: 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 search options with filters for date, size, and tags.
Assumption to check: Difficulty in finding specific PDFs due to lack of advanced search filters.
Validate with people who use this workflow before building.
Hypothesis 2
Add more editing tools such as annotations and commenting.
Assumption to check: Limited editing features compared to desktop PDF editors.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize the PDF rendering engine for better performance.
Assumption to check: Inconsistent performance on large PDF files.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clearer information and a free trial for premium features.
Assumption to check: Confusing subscription model for users.
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
Lexy PDF Viewer is the go-to PDF application that combines simplicity, utility, and versatility. With a sleek and intuitive interface, it enables you to easily create high-quality PDFs anytime, anywhere. Take photos to create PDF: Take photos of documents or anything you need to save, and Lexy PDF Viewer will instantly convert them to PDF format, don't worry about being forgotten or lost, they will be saved in the form of pictures! Instant text to PDF conversion: Type or copy and paste your text and Lexy PDF Viewer will quickly generate a PDF file. Whether you have meeting minutes or important memos, it only takes a few seconds to convert to a PDF document! Merge album pictures into PDF: Select any number of album photos and convert your favorite memories or important image files in the album to PDF with one click. Easier to save or share with others. Get Lexy PDF Viewer now, enjoy a more convenient PDF workflow, and make work easier and more efficient! Subscribe Plan: $12.90/week Contacts: [email protected] Privacy Policy: https://werx.lexypvs.com/privacyPolicy.html Terms of Use: https://werx.lexypvs.com/termsOfService.html
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
Supabase
react-native-paper
@react-navigation/native
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.
