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
Shelf Life Book Tracker
Shelf Life is a quiet, private place to keep your reading life.
$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.
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 included15 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 Shelf Life Book Tracker: 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
Implement a recommendation engine based on user reading history.
Assumption to check: Apps often lack personalized recommendations.
Validate with people who use this workflow before building.
Hypothesis 2
Ensure reliable cloud syncing with Supabase.
Assumption to check: Data syncing issues across devices.
Validate with people who use this workflow before building.
Hypothesis 3
Add features for sharing on social media or with friends.
Assumption to check: Limited social features for sharing reading progress.
Validate with people who use this workflow before building.
Hypothesis 4
Implement clear onboarding and tutorial for first-time users.
Assumption to check: In-app navigation can be confusing.
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
Shelf Life is a quiet, private place to keep your reading life. Track what you're reading, what you've finished, and what you want to read next. Search by title or ISBN, pull in covers and metadata from public catalogs, or add your own custom books and covers when something doesn't show up. And when you're ready to read on your Kobo, Shelf Life sends the epub there directly, over your home Wi-Fi, in a couple of taps. — SEND TO KOBO Drop an epub onto any book in your library. Tap Send to Kobo. Shelf Life starts a tiny server on your phone, shows you a short local web address, and you type it into your Kobo's built-in browser. Tap download. Done. No cables, no Adobe Digital Editions, no uploading your books to a stranger's cloud. The file goes from your phone to your Kobo and nowhere else. PRIVATE AND LOCAL BY DESIGN - No account. No sign-in. No sync server. - Your library lives on your device. - Epub files stay on your device or on your local network. - No analytics. No tracking. No third-party SDKs. No ads. TRACK YOUR LIBRARY - Reading, Finished, and Want to Read shelves - Search by title or ISBN, with covers and metadata from public book catalogs - Add custom books and custom covers for anything the catalogs miss - Notes, ratings, and a clean reading history QUESTIONS OR FEEDBACK [email protected] Made by a small studio in New York for people who still keep a stack of books on the nightstand.
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
Zustand
react-native-image-picker
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.
