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
HTMLViewer Local
HTMLViewer is a local-first document and web viewer
$0.99 · In-app purchases
PRICE
$0.99
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 included16 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 HTMLViewer Local: 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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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
Expand to support additional file types like CSS and JS.
Assumption to check: Limited file format support beyond HTML.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a favorites feature for quick access.
Assumption to check: No way to bookmark frequently accessed files.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize the appearance of the viewer.
Assumption to check: Lack of customization options for the viewer.
Validate with people who use this workflow before building.
Hypothesis 4
Add local storage features for offline access.
Assumption to check: No offline capability for file access.
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
HTMLViewer is a local-first document and web viewer. Import from Files, the Share Sheet, or linked folders, then organize and open HTML, Markdown, TSX/JSX, JSON, PDF, Word, Excel, and PowerPoint in one library. It is ideal for AI-generated reports, web prototypes, dashboards, learning materials, office documents, local websites, and self-contained demos. Key features: • One library for eight file categories: HTML, Markdown, TSX/JSX, JSON, PDF, Word, Excel, and PowerPoint • Outline and full-text search in one document navigator, with direct jumps and visible highlights • Offline Office previews for Word and PowerPoint, with access to the original system preview • Excel workbook support with multiple sheets, tab colors, merged cells, common styles, and number formats • Expandable JSON tree with search across keys, paths, and values • Web and component previews that preserve relative resources, plus ZIP sites and React TSX/JSX files • Import from Files, Share Sheet, complete web folders, or linked folders • Browse linked folders in place, refresh external changes, and trigger downloads for iCloud files • Group by type, filter, search, sort, move, rename, and delete library items • Control Markdown style, text size, zoom, theme, JavaScript, and external-resource access Privacy: HTMLViewer requires no account and does not actively collect personal data. You control file and folder access, and imported content stays on your device by default.
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-webview
@react-native-async-storage/async-storage
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.
