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
ReadMark: Book Tracker
track your reading with readmark, the ultimate book tracker for ios! log books, organize collections, and hit goals with stunning visuals
$4.99 · In-app purchases
PRICE
$4.99
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 included14 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 ReadMark: 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.
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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
Incorporate a social feature to share and recommend books.
Assumption to check: Lack of social features to connect with friends for book recommendations
Validate with people who use this workflow before building.
Hypothesis 2
Enable offline capability to track reading progress without internet.
Assumption to check: No offline reading tracking
Validate with people who use this workflow before building.
Hypothesis 3
Add options for users to customize book covers and layouts.
Assumption to check: Limited customization options for books' visual display
Validate with people who use this workflow before building.
Hypothesis 4
Implement advanced sorting and filtering options for better library management.
Assumption to check: Difficulty in managing large libraries
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
track your reading with readmark, the ultimate book tracker for ios! log books, organize collections, and hit goals with stunning visuals. perfect for all book lovers. why choose readmark? smart tracking: auto-calculate progress with daily logs and visual bars. custom lists: create "favorites," "want to read," or custom collections. re-reading support: track multiple sessions, keep full history. analytics: charts show reading habits and completion rates. notifications: custom reminders to stay on track. ios design: sleek dark/light modes with smooth animations. for every reader goal-oriented: set and track reading goals with analytics. casual readers: simple, intuitive book logging. collectors: organize large libraries with ease. privacy & value local storage: data stays on-device with swiftdata—no tracking. no account: start instantly, no sign-up needed. one-time buy: $4.99, no subscriptions, free updates. join book lovers tracking smarter! download readmark now to log books and hit goals. contact: [email protected].
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
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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
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react-native-chart-kit
@react-native-async-storage/async-storage
Zustand
BUILD KIT DIFFICULTY
Starter
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.
