Comparison

O2 Calendar vs IDSpace

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

About

O2 Calendar

Manage your schedule with this app, offering tools for events, appointments, notes, and daily tasks. Set custom reminders for your important activities and organize your day effectively.

Highlights

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

Features

Read full description

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

About

IDSpace

Features

Read full description

IDSpace - không gian làm việc số thông minh, linh hoạt giúp bạn quản lý công việc, dự án một cách dễ dàng.

Screenshots

O2 Calendar4 screens

IDSpace4 screens

Verdict

The call

The clearest difference is update cadence: O2 Calendar at every 4 days against IDSpace's monthly. O2 Calendar also leads on iOS requirement (9.0 vs 13.4). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

O2 Calendar ships an update every 4 days, IDSpace monthly. The most recent releases landed on July 22, 2026 and September 19, 2026 respectively.

Scorecard2 real differences · 6 level

O2 Calendar versus IDSpace: the parameters behind the verdict, then further details
Parameter	O2 Calendar	IDSpace
Price	Free	Free
Positive reviews	50.0% of reviews	—
Update frequency	Every 4 days — better	Monthly
Ads	No	No
In-app purchases	No	No
Monetization	Free	—
Devices	iPhone, iPad, iPod	iPhone, iPad, iPod
Requires iOS	9.0 — better	13.4
Further details — not scored
Size	52 MB	65 MB
Age rating	4+	4+
Developer	O2 VN Tech.,JSC	IDTEK JOINT STOCK COMPANY

In-app purchases

None

O2 Calendar

No in-app purchases

None

IDSpace

No in-app purchases

Questions

Is O2 Calendar free?

O2 Calendar is free to download, with no in-app purchases.

Is IDSpace free?

IDSpace is free to download, with no in-app purchases.

Do O2 Calendar or IDSpace have ads?

Neither O2 Calendar nor IDSpace shows ads.

Which is updated more often, O2 Calendar or IDSpace?

O2 Calendar ships an update every 4 days, and IDSpace monthly. Most recently, O2 Calendar was updated on July 22, 2026 and IDSpace on September 19, 2026.