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.
BookMaster — Reading Progress Tracker
$1.99 · 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.
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Combine features and design from your favorite apps.
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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 BookMaster - Reading Companion: 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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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: Difficulty tracking reading progress and habits.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited social features to share reading experiences.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Not enough customization options for book tracking.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited insights and statistics about reading habits.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
BookMaster — Reading Progress Tracker Your digital bookmark. Always visible. Track where you are in every physical book you're reading. See your progress on your home screen. No accounts, no social features, no subscriptions. Just you and your books. WHY BOOKMASTER You read physical books. Maybe several at once. You lose bookmarks, forget page numbers, wonder how far along you actually are. BookMaster fixes that in seconds — open it, tap your book, update your page. Done. With widgets on your home screen and Lock Screen, you don't even need to open it — your current book is right there, showing where you left off. Tap a widget to log your new page. WHAT YOU GET - Track page progress across multiple books - Home Screen and Lock Screen widgets — tap any widget to log your page - Reading goals — yearly, quarterly, or monthly targets - Color-coded books with auto-generated visual identity - Beautiful insights: reading pace, time to complete, and progress over time - Export everything anytime (CSV, Markdown, JSON) WHAT YOU DON'T GET No reviews. No ratings. No "connect with friends." No algorithmic feeds. No subscriptions. No premium tiers. No cloud dependency. This is deliberate. Every feature we didn't add makes the ones we did add faster and more focused. ONE-TIME PURCHASE Pay once. Use forever. Free updates included — we've shipped three major versions since launch. The kind of support others charge monthly for. PRIVACY Everything stays on your device. No accounts. No cloud. No tracking. No analytics. Your reading habits are nobody's business. DESIGN Built for iOS 26 from day one. Liquid Glass design language throughout — translucent, elegant, fast. Beautiful tools make routine tasks pleasant. BookMaster does one thing exceptionally well: it remembers what page you're on. Requires iOS 26 or later.
Written user reviews are not shown here. Check current App Store reviews >
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.