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
MayanChart - Mayan astrology
"A comprehensive and rich exploration of Mayan astrology using the Mayan calendar system available on the iPhone".
$6.99 · In-app purchases
PRICE
$6.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
14 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.
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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/
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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 MayanChart - Mayan astrology: map the core Entertainment 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 add more personal details and preferences.
Assumption to check: Limited customization options for user profiles
Validate with people who use this workflow before building.
Hypothesis 2
Utilize user feedback to improve accuracy and personalization.
Assumption to check: Inaccurate horoscope predictions
Validate with people who use this workflow before building.
Hypothesis 3
Include options for users to share their charts and horoscopes on social media.
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Implement offline capabilities for previously generated charts.
Assumption to check: No offline access to charts
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
"A comprehensive and rich exploration of Mayan astrology using the Mayan calendar system available on the iPhone". Follow the long lost wisdom of the Mayan people in their observation of stars and planets and read your personal astrological reading. Let the NightLords, DaySigns, WeekBearers, YearBearers, MayanTones and more tell all you wanted to know about yourself and friends. Enter your date of birth and let MayanChart calculate your personal astrological reading based on the ancient knowledge of the once so ingenious civilization. MayanChart features: - Store unlimited profiles of friends, family and everyone you know - Quick view of mayan reading for each profile - Profiles are arranged by name for easy access - Get a complete Mayan chart reading based on your birthdate - Find out your Mayan Long Count and Haab sign based on date of birth - DaySign influence - Tone influence - Pulse or WeekBearer with tone - YearBearer influence - NightLord influence - Explanation or significance of each reading - Description of the attributes and influences on your character - Handy help and explanation of Mayan calendar. Let your journey into the the realm of the Maya begin...
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
Redux
React Navigation
Axios
Firebase
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.
