App Overview

Sun Calendar icon

Sun Calendar

Steven Edwards · Weather

For over 12 years we have been supplying Sunrise and Sunset calendars on our web site

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.3
43 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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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/
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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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Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Sun Calendar: map the core Weather 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 detailed forecasts and historical data

Assumption to check: Limited weather details compared to other apps

Validate with people who use this workflow before building.

Hypothesis 2

Enable more granular control over alert preferences

Assumption to check: Lack of user customization for notifications

Validate with people who use this workflow before building.

Hypothesis 3

Implement an offline mode with cached data

Assumption to check: No offline access to weather data

Validate with people who use this workflow before building.

Hypothesis 4

Provide more free features to enhance user engagement

Assumption to check: In-app purchase for basic features

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

For over 12 years we have been supplying Sunrise and Sunset calendars on our web site. We were awarded the Sky Award by the Griffith Observatory. We now have this app designed for the iPhone and iPad. All the features of the web site have been included plus more: • Daily times and other info is on the home screen • Sunrise, sunset, day length and solar noon times • Sunrise azimuth and sunset azimuth • Moonrise, moonset and moon phase times • Moon percent illuminated info • Easily create multiple month calendars • Print directly to your AirPrint printer • Email yourself the calendars, which are attached as PDFs. Print the PDFs from your laptop or desktop computer. • CSV data can be attached to the email • Copy an image of the current calendar into the clipboard • Various formatting options for times, latitude, longitude and larger font size selection • Choose the day of week you want the calendar to start on • Track Sun option will show local time on home screen and follow the sun across the screen during the day • Thousands of predefined locations, U.S., Canada and around the world • Favorites screen saves locations for quick selection • Ability to make a predefined location a favorite or add your own location as a favorite • Red Pin feature on the map makes it easy to measure distances between any two points

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.

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BUILD KIT DIFFICULTY
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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.