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
Cat Calendar：Schedule Planner
Introducing Cat Calendar, a brand new minimalist calendar application with adorable feline companions.
$0.49 · In-app purchases
PRICE
$0.49
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
111 ratings · Top 15%
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 included17 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 Cat Calendar：Schedule Planner: map the core Productivity 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
Allow users to customize task colors and event notifications.
Assumption to check: Limited customization options for events and tasks
Validate with people who use this workflow before building.
Hypothesis 2
Implement a feature for setting up recurring tasks easily.
Assumption to check: Difficulty in tracking recurring tasks
Validate with people who use this workflow before building.
Hypothesis 3
Add shared calendars or task lists for collaborative planning.
Assumption to check: Lack of collaboration features
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with Google Calendar or Apple Calendar for syncing.
Assumption to check: No integration with other calendar services
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
Introducing Cat Calendar, a brand new minimalist calendar application with adorable feline companions. • Design Philosophy Day by day, let the company of cute cats accompany you, step by step, on your journey together. With a uniquely innovative countdown feature, these cats will chase time with you, eagerly waiting for that moment when the marked countdown reaches zero. Stripping away the complexity of calendar settings, Cat Calendar focuses on simple and user-friendly core features, achieving both simplicity and ease of use. • Features - Every day is a new adventure; use Cat Calendar to record important events and effortlessly track the nuances of daily life. - Compatible with iOS 26 and supports the Liquid Glass style. - The innovative countdown will make you feel like the cats are moving forward with you, adding a sense of the beauty and significance of life. • Adorable Skin Unlock Instructions - Unlock cats with different personalities and purchase corresponding skins to use. • Privacy Policy and Terms of Use: https://nicolecat.com/calendar/privacy.html https://nicolecat.com/calendar/terms.html • Contact Us: Email: [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
Zustand
react-navigation
@react-native-async-storage/async-storage
expo-calendar
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.
