App Overview

Day & Night World Time Map icon

Day & Night World Time Map

Leviathan Software Ltd · Reference

Interactive world map showing day/night, local time, moon phases & planets.

$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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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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Day & Night World Time Map: map the core Reference 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

Include favorites and notifications for city time updates.

Assumption to check: Lack of features for multiple time zones tracking

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to personalize map styles and clock formats.

Assumption to check: Limited customization options

Validate with people who use this workflow before building.

Hypothesis 3

Optimize map loading and interactions for smoother performance.

Assumption to check: Poor performance on low-end devices

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

Interactive world map showing day/night, local time, moon phases & planets. WulfTerra provides Earth related phenomena such as Sun, Moon and Planetary data, a compass locator and time and time-zone information for anywhere on the planet. All information is updated in real-time. - No internet connectivity is required at all. - The application contains no ads or distractions. - No user or usage data is collected or used. The main display shows a live visualization of daylight, night and the various types of twilight. It also shows various metrics such as sunrise, sunset, altitude, solar noon, etc in relation to a fixed point on the Earths surface. The moon location, phase and various attributes for the major planets are shown in a separate panel, along with a mini-compass (if supported on the device) to help locating objects. A graphical orrery and plant-finder is also provided. A location on the Earth can either be selected manually or by using location services on the device. Feature Summary: - Real-time displays of the Sun, Moon and major Planets. - Real-time compass information (if supported on the device). - Real-time day/night boundary (including all the types of twilight). - Time-Zone information for the whole of the planet. - Multiple data views (including Map, Dashboard and entity-by-entity). - User can manually update the date and time to provide future or historical results. - Times of sunrise and sunset for any location on Earth. - Uses device location services to automatically set the users position. - Various Sun metrics including sub-solar point, solar-noon, altitude above the horizon, distance from the Earth. - Various Moon metrics including visual depiction of the moon and its location along with its current phase. - Various Planet metrics including visual depiction of the planet and its location along with its current distance, magnitude etc. - Multiple map types available. - Markings for the equator, tropics, Arctic circle, Antarctic circle and meridian. - Changes are saved and reloaded automatically. - Tracking of the mouse (on Windows and MacOS) to provide information on any location in the world. - Dashboard for planetary data.

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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
react-native-maps
zustand
expo-location
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.