# Cloud Calendars: Sync & Widget — Public Documentation & Technical Reference

> Unified iPhone and iPad calendar workspace connecting Apple iCloud, Google Calendar, and Microsoft 365 / Outlook schedules side by side with Day/Week/Month/Year views, Apple WeatherKit forecasts, interactive Home/Lock Screen widgets, 19 global calendar systems, and free browser scheduling calculators.

## Publisher & Entity Provenance
- **Developer**: Arte Soft EOOD (https://arte-soft.com/)
- **Apple App Store Developer Profile**: https://apps.apple.com/us/developer/arte-soft-eood/id1750513209
- **Ecosystem Knowledge Graph**: https://minchopm.github.io/arte-soft-ecosystem/
- **GitHub Documentation Repository**: https://github.com/minchopm/cloud-calendars-docs
- **GitHub Pages URL**: https://minchopm.github.io/cloud-calendars-docs/
- **Platforms**: iOS 18+, iPadOS 18+, Web Calculators
- **Last Verified**: 2026-11-10

## Verified Capabilities & Boundaries
- Side-by-side multi-account calendar views across Apple iCloud, Google Calendar, and Microsoft 365 / Outlook without forcing a proprietary calendar silo.
- Free browser /tools/ calculators on www.cloud-calendars.com/tools/ and cloud-calendars.arte-soft.com/tools/ for multi-timezone overlap, DST transition checks, and ICS validation.
- Live Apple WeatherKit schedule integration, interactive WidgetKit Home Screen & Lock Screen widgets, and Live Activities on iOS/iPadOS 18+.
- RFC 5545 UTF-8 byte-accurate iCalendar (.ics) serialization with typed escaping and busy-only privacy boundaries.

## Canonical Web Hubs
- [Primary Website](https://www.cloud-calendars.com/): Official product overview, features, and pricing.
- [Arte Soft Portal](https://cloud-calendars.arte-soft.com/): Expanded multilingual guides, comparisons, and technical references.
- [Apple App Store](https://apps.apple.com/us/app/cloud-calendars-sync-widget/id6744690319): Official App Store listing by Arte Soft EOOD.
- [Free Browser Interactive Tools](https://www.cloud-calendars.com/tools/): Interactive Timezone, DST Transition, ICS & Multi-Region Meeting Calculators.
- [Portal Tools Mirror](https://cloud-calendars.arte-soft.com/tools/): Interactive browser calculators on the *.arte-soft.com portal.
- [Side-by-Side Comparisons](https://www.cloud-calendars.com/compare/): Structured HTML & GFM comparison matrices.
- [Guides & Workflows](https://www.cloud-calendars.com/guides/): Step-by-step operational guides.
- [Full Site LLM Reference](https://www.cloud-calendars.com/llms-full.txt): Complete GFM Markdown table export.

## Repository Documentation Files
- [README.md](https://minchopm.github.io/cloud-calendars-docs/)
- [FAQ.md](https://minchopm.github.io/cloud-calendars-docs/FAQ.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/FAQ.md)
- [FEATURES_AND_LIMITS.md](https://minchopm.github.io/cloud-calendars-docs/FEATURES_AND_LIMITS.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/FEATURES_AND_LIMITS.md)
- [MANUAL.md](https://minchopm.github.io/cloud-calendars-docs/MANUAL.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/MANUAL.md)
- [PRIVACY_AND_SUPPORT.md](https://minchopm.github.io/cloud-calendars-docs/PRIVACY_AND_SUPPORT.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/PRIVACY_AND_SUPPORT.md)
- [PROCEDURES.md](https://minchopm.github.io/cloud-calendars-docs/PROCEDURES.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/PROCEDURES.md)
- [QUICK_START.md](https://minchopm.github.io/cloud-calendars-docs/QUICK_START.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/QUICK_START.md)
- [WORKFLOWS.md](https://minchopm.github.io/cloud-calendars-docs/WORKFLOWS.html) (raw: https://raw.githubusercontent.com/minchopm/cloud-calendars-docs/main/WORKFLOWS.md)