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
Hoopla: Your Library Anywhere
Thousands of free books, audio, comics, and more available right now with your library card
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
1,382,913 ratings · Top 5%
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 included14 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 Hoopla: Your Library Anywhere: map the core Books 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
Focus on partnerships with more publishers to expand content library
Assumption to check: Limited availability of titles compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Revamp the loans section for easier tracking and management
Assumption to check: Clunky loan management interface
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more robust search algorithm for better accuracy
Assumption to check: Inconsistent search results
Validate with people who use this workflow before building.
Hypothesis 4
Introduce offline reading capabilities for enhanced user experience
Assumption to check: No offline access for borrowed content
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
Thousands of free books, audio, comics, and more available right now with your library card. No subscription. No ads. Just borrow and read. Hoopla Digital connects your local public library to your phone, giving you instant access to thousands of free audiobooks, eBooks, comics, graphic novels, manga, and magazines with new titles added daily. Free Books and Audiobooks Available Right Now Borrow audiobooks and eBooks of all genres. From romance to psychological thrillers, discover chart-topping new releases, indie authors, and classics to stream or download anytime. Comics, Manga, and Graphic Novels Dive into an enormous library of comics and manga across every genre. Our ActionView feature brings panel-by-panel reading to life with stunning detail. Watch Free Movies and TV Stream movies, anime, documentaries, and TV shows at home or on the go. Use BingePass for seven-day unlimited access to premium channels like Hallmark+ and PBS or SeasonPass to borrow and binge watch the full season in one sitting. Listen to Music Albums Borrow full albums by artists like Taylor Swift, Sabrina Carpenter, Bruno Mars and Morgan Wallen. Shuffle between multiple albums to create a unique playlist of songs by your favorite musical artists. Built for How You Live • Apple CarPlay support for hands-free audiobooks and music on the road • Dark mode for comfortable late-night reading • Sleep timer so you never lose your place • Offline downloads — no data needed once borrowed All you need is a free library card from a participating library.
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 Navigation
Axios
Zustand
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.
