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
Chirp Audiobooks
Chirp brings you huge audiobook deals — without a monthly commitment or subscription
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
88,262 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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.
JavaScript is required to complete mailbox verification.
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 Chirp Audiobooks: map the core Books workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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 catalog and partnerships with publishers.
Assumption to check: Limited audiobook selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly subscription model.
Assumption to check: In-app purchase prompts can be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Enhance controls for a better listening experience.
Assumption to check: Audio playback controls can be clunky
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download samples for offline listening.
Assumption to check: No offline listening for non-purchased titles
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
Chirp brings you huge audiobook deals — without a monthly commitment or subscription. Discover bestselling audio books starting at $1, plus hundreds of free audiobooks. Our team of audiobook lovers works with publishers and authors to deliver handpicked, limited-time deals to your inbox daily. Chirp makes it easy for millions of listeners to find their next audiobook. With the Chirp app, you can conveniently download or stream any audiobooks purchased from the Chirp website (chirpbooks.com) directly on your iPhone or iPad. ABOUT CHIRP - All your favorite audiobooks — including bestsellers, mysteries & thrillers, memoirs, classics, romance, science fiction & fantasy, and more — at your fingertips - Personalized emails alerting you to free and heavily discounted titles - New audiobook deals every day, including hundreds of free listens - Instantly available audiobooks with no waitlists - No subscription fees -On average, our members save more than $68/year with Chirp HOW IT WORKS - Sign up for free and tell us what types of books you enjoy - Discover bestselling audiobooks starting at $1, plus hundreds of free audiobooks - Download and start listening with our free app on iOS - The audiobooks are yours to keep FEATURES OF THE CHIRP APP - Stream or download audiobooks to enjoy offline listening in the app - Listen seamlessly on the road with CarPlay - Convenient sleep timer functionality - Effortless chapter navigation - Intuitive bookmark feature so you never lose your place - Highly customizable listening speeds Join the millions of Chirp customers getting amazing deals on audiobooks. Download the app and sign up today! Your feedback is important to us, so please consider leaving us a review.
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
@supabase/supabase-js
expo-av
BUILD KIT DIFFICULTY
Expert
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.
