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
Peek — A Quick Look Extension
Accelerate your workflow with the Quick Look conveniences that only Peek can deliver: searching, jumping, scroll restoring, syntax highlighting, & more.
$7.99 · In-app purchases
PRICE
$7.99
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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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 Peek — A Quick Look Extension: map the core Developer Tools 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
Include support for more file types like audio and video.
Assumption to check: Limited file types supported for preview
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline file caching and access.
Assumption to check: No offline access to files
Validate with people who use this workflow before building.
Hypothesis 3
Add an onboarding tutorial for new users.
Assumption to check: No clear onboarding process
Validate with people who use this workflow before building.
Hypothesis 4
Offer a free tier with limited features to attract users.
Assumption to check: High price point for basic 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
Accelerate your workflow with the Quick Look conveniences that only Peek can deliver: searching, jumping, scroll restoring, syntax highlighting, & more. -- Due to system limitations, Peek is ~NOT~ able to support the following documents, not limited to: plain text (.txt, .text), rich text (.rtf, .rtfd), HTML/XML/web archives (.html, .xml*, .webarchive), TypeScript (.ts), Adobe suite (.pdf), Microsoft Office (.csv, .doc, .docx, .xls, .xlsx, .ppt, .pptx), OpenDocument suite (.odt, .ods, .odp), nor any Apple iWork documents (.pages, .numbers, .key). -- • Rich previews of Markdown, TextBundle, PostScript, & .ePDF documents. • Jump to lines/pages & search documents from Quick Look previews in Finder & other friendly applications. • Brings popular system keyboard shortcuts to Peek-supplied Quick Look previews: search, jump to line, scroll to end/beginning of a document. • Supports Github-style Markdown with an optionally generated table of contents: • Autoload any of 191 HighlightJS languages or 273 PrismJS languages. • Lazy syntax highlighting, MathJax typesetting, and Mermaid.js diagramming. • Use absolute and relative local filesystem links. • MathJax with Tex input (full inline support utilizing a bespoke cmark extension). • Use a Quick Action to quickly rename a PDF document to an .ePDF document to search or copy text, more easily navigate pages, & preview using Dark mode themes. • Force click on terms to launch the Look Up functionality. • Preview sizes from 5KB to 1MB (excluding PDFs & property list files). • Save and restore scroll positions—continue from where you last left off. • Syntax highlighting with automatic language detection for the most popular programming languages. • Customize your preview experience with over 70 different light & dark themes, or customize your style in a CSS stylesheet. • Optionally include line numbers in source code previews. • Peek attempts to support previews for the most common file types, including those not currently supported by the system: • Cartfile, Podfile, .gitignore, .swiftlint.yml, .xcconfig, .swift, .c, .py, and many more. • Visit Peek's website for the most up-to-date list of compatible files.
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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.
SUGGESTED BUILD STACK
React Native
Expo
Zustand
react-navigation
expo-file-system
react-native-share
BUILD KIT DIFFICULTY
Advanced
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.
