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
MoonWorx Lunar Calendar
THE lunar calendar - your perfect companion for every day!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
5 ratings · Top 30%
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
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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'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 MoonWorx Lunar Calendar: map the core Lifestyle 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 set specific notification times and types.
Assumption to check: Limited customization options for notifications
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a feature to share events with friends or on social media.
Assumption to check: No community features for sharing lunar events
Validate with people who use this workflow before building.
Hypothesis 3
Provide in-depth articles or resources for each moon phase.
Assumption to check: Lack of detailed lunar phase explanations
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the visual design with animations and customizable themes.
Assumption to check: Static design lacks visual appeal
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
THE lunar calendar - your perfect companion for every day! The calendar calculates data from January 1800 to December 2027. You are looking for a lunar calendar app - with minute-accurate calculation of all moon phases, zodiac changes and void of course? - with biorhythm, moon yoga, retrograde Mercury and complete monthly overview? - with rising and setting of sun and moon? - with great design? Don't look any further! MoonWorx is your perfect companion. You will receive all above mentioned functions and many more information about the current day quality. Read daily tips for more than 90 activities categorized into 7 categories (household, garden, nutrition, body care, hair care, health, DIY), which you can also plan wonderfully with the monthly view. MoonWorx is one of the few lunar calendars, which can calculate the zodiac change in tropical or sidereal mode or by Maria Thun. She is mainly known in Germany for gardening with the moon. The biorhythm calculates your personal high and low phases for body, mind and soul, as well as for the secondary biorhythms aesthetics, intuition, awareness and spirituality. In addition to the well-known symmetrical sinusoidal curves, the biorhythm can also be calculated asymmetrically according to Paungger and Poppe. In a small guide you will also receive additional information about the moon, biorhythm, moon phases, void of course, zodiac signs, elements, as well as functional instructions for the app. » Multilingual: German and English
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
axios
async-storage
react-navigation
expo-calendar
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.
