---
title: "Extreme Calendar — App Overview"
url: https://marlvel.ai/apps/extreme-calendar
category: Business
developer: Birdsoft LLC
platforms: ios
rating: 4.3 (24 ratings)
pricing: paid
report_level: overview
generated: 2026-04-27
last_verified: "2026-04-27T09:38:18.664Z"
---

<!-- SECTION: Key Insight -->
> **Key Insight:** While the app offers robust customization and powerful views, users report inconsistent stability regarding sync functionality and UI responsiveness.

<!-- SECTION: Quick Facts -->
| Metric | Value |
|--------|-------|
| Category | Business |
| Rating | 4.3 ★ (24) |
| Pricing | paid |
| Platforms | iOS |
| Latest Version (iOS) | 5.28 |
| Developer | Birdsoft LLC |

<!-- SECTION: Summary -->
## What is Extreme Calendar?

Extreme Calendar is a productivity tool for iOS that provides advanced calendar views and in-line event creation for high-density scheduling. It leverages native calendar data to offer features like contact-integrated birthdays, custom repeating events, and visual time bars for quick information retrieval.

<!-- SECTION: Key Features -->
## Key Features

- **Advanced Calendar Views**: Offers multiple display modes including Year, Month, Week, Day, and an Upcoming Agenda list.
- **Native Integration**: Syncs with standard calendar services like Google, iCloud, and Exchange while pulling contact data for birthdays and anniversaries.
- **Customization Options**: Supports advanced repeating event logic, military time, ISO week standards, and visual icons for event categorization.
- **In-line Event Management**: Designed for rapid data entry to allow users to manage busy schedules efficiently.

<!-- SECTION: Target Audience -->
## Who is it for?

Power users and professionals who require granular control and high-density data visualization for their daily schedules.

<!-- SECTION: Links -->
## Links

- [App Store](https://apps.apple.com/us/app/extreme-calendar/id431771565?uo=4)
- [Full Intelligence Report](https://marlvel.ai/apps/extreme-calendar)

---
*This is an overview report. Sentiment analysis, competitive landscape, and SWOT analysis are available in the [full intelligence report](https://marlvel.ai/apps/extreme-calendar).*
*Generated by [Marlvel.ai](https://marlvel.ai) — Independent app intelligence.*