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
Maya Long Count
Track the famous calendar that began a new cycle (b'ak'tun) on December 21st, 2012 and convert between dates in the Gregorian calendar and the Maya Long Count calendar
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Maya Long Count: 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
Provide educational content or tooltips explaining the Long Count.
Assumption to check: Users find it hard to understand the Long Count system
Validate with people who use this workflow before building.
Hypothesis 2
Add features like reminders for upcoming Long Count dates.
Assumption to check: Limited functionality for users beyond basic calculations
Validate with people who use this workflow before building.
Hypothesis 3
Implement social sharing options for calculated dates.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Focus on creating a more modern and visually appealing UI.
Assumption to check: Poor user interface and design
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 the famous calendar that began a new cycle (b'ak'tun) on December 21st, 2012 and convert between dates in the Gregorian calendar and the Maya Long Count calendar. Built exclusively for iPhone, Maya Long Count is a quick and easy way to accurately calculate and view the long count date and haab' and tzolk'in sacred round values. The application allows you to see how dates would have been written by the Maya and convert between the current Gregorian and the Long Count calendars. It can show you any date from January 1st, 9999 BCE to December 31st, 9999 CE and let you convert from any date in the current Piktun cycle (from 0.0.0.0.0 to 19.19.19.17.19). Features * Supports iOS 16.0 and later * Convert any Gregorian date from January 1st, 9999 BCE to December 31st, 9999 CE * Convert any Long Count date within the current piktun * Select one of the 27 standard correlations for the calendar's start * Default correlation using Goodman, Martinez, and Thompson (GMT) * Quickly add or subtract a day to see the changes * No connection required - works anywhere! * Hand-drawn calendar glyphs
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
React Navigation
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date-fns
react-native-paper
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.
