# O2 Calendar

> A free productivity app for managing schedules, events, and tasks. (iPhone/iPad app by O2 VN Tech.,JSC.)

- Source: https://appshunter.io/ios/app/o2-calendar/id1547745521 (this page in markdown: same URL + `.md`)
- Developer: [O2 VN Tech.,JSC](https://appshunter.io/developer/1547745523)
- Category: Productivity, Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 9.0 · 52 MB
- Languages: American English
- Released: 2021-01-15
- Data updated: 2026-07-22
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/o2-calendar/id1547745521/reviews.md

## What is O2 Calendar?

O2 Calendar là công cụ tốt nhất để quản lý công việc của bạn: Lịch, Sự kiện, cuộc hẹn, ghi chú và công việc hàng ngày.

Tính năng, đặc điểm
- Tạo và quản lý sự kiện
- Nhắc nhở tùy chỉnh cho Sự kiện
- Tạo nhắc nhở hàng ngày

## Key features

- Event creation and management
- Customizable event reminders
- Daily task reminders
- Note-taking functionality
- Appointment scheduling

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/o2-calendar/id1547745521/reviews.md

### 1/5 — Không cho đăng ký để vào app

*2022-10-01, version 1.0.36*

Không cho đăng ký để vào app

### 4/5 — Khá tốt vẫn có thể cải thiện hơn

*2021-01-20, version 1.0.1*

Lịch dùng khá tốt nhưng vẫn có nhiều điểm có thể cải tiến, 4 sao

## Frequently asked questions about O2 Calendar

### What is O2 Calendar?

O2 Calendar is a free productivity application designed to help users manage their schedules, events, appointments, notes, and daily tasks. It allows for the creation and management of events with customizable reminders.

### Is O2 Calendar free to use?

Yes, O2 Calendar is completely free to download and use. There are no in-app purchases or subscription fees associated with its core functionality.

### What devices is O2 Calendar compatible with?

O2 Calendar is available for iOS devices, including iPhone, iPad, and iPod. It is designed to run on these Apple platforms.

### How often is O2 Calendar updated?

The app was last updated on November 28, 2025, indicating regular maintenance and potential feature additions. The current version is 1.1.06.

### Does O2 Calendar have ads?

No, O2 Calendar does not contain advertisements. Users can enjoy an ad-free experience while managing their productivity.

### What is the age rating for O2 Calendar?

O2 Calendar has an age rating of 4+, making it suitable for a wide range of users, including children and adults.

### Can I set recurring reminders with O2 Calendar?

The description mentions customizable reminders for events and daily task reminders. While specific details on recurring reminders aren't provided, the app focuses on timely notifications for your schedule.

### What kind of tasks can I manage with O2 Calendar?

O2 Calendar is designed for managing daily tasks, events, appointments, and notes. It provides a centralized platform for organizing your to-do lists and commitments.

## Version history (last 5 releases)

### 1.1.06 — 2025-11-28

- Fix lỗi

### 1.1.05 — 2025-11-19

- Tối ưu chức năng

### 1.1.04 — 2025-11-09

- Fix giao diện

### 1.1.03 — 2025-11-05

- Sửa lỗi hiển thị lịch

### 1.1.02 — 2025-11-04

- Cập nhật xử lý thông báo

## Apps similar to O2 Calendar

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Calunar: Lịch âm Bính Ngọ 2026](https://appshunter.io/ios/app/calunar-lich-am-binh-ngo-2026/id921420481) | 3.9 (7) | Free | Productivity |
| [Calenvi - Lịch Việt](https://appshunter.io/ios/app/calenvi-lich-viet/id6478478283) | 3.5 (4) | Free | Productivity |
| [MoriCare - Trợ lý gia đình](https://appshunter.io/ios/app/moricare-tro-ly-gia-inh/id1588235073) | — | Free | Productivity |
| [Hi+Boss](https://appshunter.io/ios/app/hi-plus-boss/id1644878243) | — | Free | Productivity |
| [Afreeday Time](https://appshunter.io/ios/app/afreeday-time/id6447260037) | — | Free | Productivity |
| [LUKLAK](https://appshunter.io/ios/app/luklak/id1629796249) | — | Free | Productivity |

## More apps by O2 VN Tech.,JSC

- [O2 Meet](https://appshunter.io/ios/app/o2-meet/id1547999418)
- [O2 Task](https://appshunter.io/ios/app/o2-task/id1556588653)

All apps by O2 VN Tech.,JSC: https://appshunter.io/developer/1547745523

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-22.*