# HiCal vs O

The clearest difference is update cadence: O at every 3 weeks against HiCal's every 2 months. HiCal's advantage is iOS requirement (13.0 vs 15.5). On price, ads, in-app purchases and device support there is nothing between them.

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

HiCal ships an update every 2 months, O every 3 weeks. The most recent releases landed on October 21, 2026 and October 11, 2026 respectively.

## The numbers

| Metric | HiCal | O |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (25 ratings)](https://appshunter.io/ios/app/hical-collaborative-calendar/id913908607/reviews)** | — |
| Number of ratings | **25** | — |
| Positive reviews | 55.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 3 MB |
| Requires iOS | **13.0** | 15.5 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Nakagawa Yugo](https://appshunter.io/developer/1229738088) | [O-TECH JAPAN](https://appshunter.io/developer/1219186631) |

## What reviewers say

### HiCal

[App page](https://appshunter.io/ios/app/hical-collaborative-calendar/id913908607)

This app facilitates collaborative event planning and scheduling for groups. Share timetables, receive real-time updates on changes, and communicate via comments. Ideal for students, project teams, and organizations to stay synchronized.

**Highlights:** Group event scheduling, Real-time push notifications, Event comments and discussion, Shared timetables, Private and public groups, Event repetition support

**In-app purchases:** none


### O

[App page](https://appshunter.io/ios/app/o-tech-shift/id1645042734)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is HiCal free?

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

### Is O free?

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

### Do HiCal or O have ads?

Neither HiCal nor O shows ads.

### Which is updated more often, HiCal or O?

HiCal ships an update every 2 months, and O every 3 weeks. Most recently, HiCal was updated on October 21, 2026 and O on October 11, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*