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
ChronoListen: Audiobook Player
Play the audiobooks you already own on your watch.
$12.99 · In-app purchases
PRICE
$12.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 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 ChronoListen: Audiobook Player: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Play the audiobooks you already own on your watch. ChronoListen imports your M4B and M4A files on your phone and sends them straight to your watch. Once a book is on your wrist it plays offline, so you can run, walk or commute with just your watch and headphones. One purchase. No subscription, no account, no cloud. PHONE + WATCH • Send any book to your watch with one tap • Listen on the watch with no phone nearby • Progress stays in sync between both devices • Chapters, playback speed and sleep timer right on the watch • Now Playing complication for your watch face A REAL AUDIOBOOK PLAYER • Chapter list and chapter-by-chapter navigation • Scrub the whole book or just the current chapter • Playback speed from 0.75x to 3x • Sleep timer: 5 to 60 minutes, or stop at the end of the chapter • Skip intervals from 10 to 60 seconds • Stealth Mode: an all-black player with no cover art, for listening in the dark • Background playback with Lock Screen controls • Siri and Shortcuts: "Resume my audiobook in ChronoListen" PRIVATE BY DESIGN • Your books never leave your devices • No account and no sign-in • No ads, no analytics, no tracking Your audiobooks. Your watch. No middleman.
Written user reviews are not shown here. Check current App Store reviews >
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
Partner with publishers to broaden the catalog.
Assumption to check: Limited audiobook selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Focus on simplicity and ease of navigation.
Assumption to check: Cluttered user interface
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a subscription model to lower barrier to entry.
Assumption to check: High initial purchase price
Validate with people who use this workflow before building.
Hypothesis 4
Implement a bookmarking feature to enhance user experience.
Assumption to check: No bookmarking feature
Validate with people who use this workflow before building.
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
react-native-slider
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.
