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.
Build the bookshelf you've always wanted.
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Shelfy: Book Tracker & TBR: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Build the bookshelf you've always wanted. Shelfy turns reading into a cozy daily ritual — a beautiful private library, a focused reading timer with soundscapes, and the quotes and ideas you'll actually keep. "It just feels good to use. I catch myself opening the app instead of Instagram." — Kim T. "The shelves are so cute and customizable. Worth the annual fee." — MamaMaestraKP — YOUR PRIVATE LIBRARY — Add books by search, barcode, or photo of the cover. Watch them appear on a stunning 3D shelf you can customize end-to-end: wood textures, picture frames, statues, even the way your spines look. It's a bookshelf that finally feels like yours. — A READING RITUAL, NOT A CHORE — Start a focused reading session with ambient soundscapes — rain, cafe, fireplace, forest. Track time and pages without breaking flow. Pause when life happens, pick up where you left off. — CAPTURE WHAT YOU LOVE — Snap a page and Shelfy turns it into a clean text quote. Save bookmarks with a tap, search across every book you've read, and stop losing the lines that mattered. — DISCOVER WHAT TO READ NEXT — Swipe through personalized recommendations tuned to your taste. Build a TBR pile that actually excites you instead of one you keep avoiding. — STATS THAT MOTIVATE, NOT GUILT-TRIP — Daily, monthly, and yearly reading stats. Reading speed, longest streaks, favorite genres. A Year in Review that's actually fun to share. Earn achievements as you go. — A SMART READING COMPANION — Ask questions about any book as you read. Get a plot recap when a side character returns 200 pages later. Discuss themes, explore ideas, and remember more. — IMPORT YOUR BOOKS — Coming from Goodreads or StoryGraph? Bring your entire library, ratings, and shelves in one tap. We even auto-detect series and add the missing volumes. — READS LIKE A PHYSICAL BOOK SHOULD FEEL — Saw a book on TikTok or Reels? Share the video to Shelfy and we'll add it to your shelf. iCloud sync keeps your library identical on every device. Widgets, Siri shortcuts, and a yearly challenge keep reading top of mind. Shelfy is a subscription-first reading app, built and supported by a tiny indie team who reply to every email. We don't sell your data, we don't run ads, and we don't gamify reading into a chore. We just want you to fall back in love with books. Start your shelf today. — Shelfy Pro subscription unlocks all features. TERMS: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited book discovery features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchase confusion
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Basic user profiles
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.