# O2 Car Control vs RingCalendar

The clearest difference is in-app purchases: O2 Car Control at none against RingCalendar's 2. O2 Car Control also leads on iOS requirement (17.6 vs 26.5). RingCalendar's advantage is update cadence (every 3 days vs every 4 months). On price, ads and device support there is nothing between them.

Both are free to download. RingCalendar sells 2 one-off in-app purchases. O2 Car Control asks for nothing beyond the download.

O2 Car Control ships an update every 4 months, RingCalendar every 3 days. Both last shipped on November 10, 2026.

## The numbers

| Metric | O2 Car Control | RingCalendar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 days** |
| Size | 47 MB | 22 MB |
| Requires iOS | **17.6** | 26.5 |
| Devices | iPhone, iPad | iPhone, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [O2 Czech Republic a.s.](https://appshunter.io/developer/311143795) | [IO CZ s.r.o.](https://appshunter.io/developer/6810563572) |

## What reviewers say

### O2 Car Control

[App page](https://appshunter.io/ios/app/o2-car-control/id512635003)

**Features:** Vision Pro support

**In-app purchases:** none


### RingCalendar

[App page](https://appshunter.io/ios/app/ringcalendar/id6810563570)

**Features:** Apple Watch app, Vision Pro support, iPhone Duo support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 7-Day Trial | Free | one-time |
| RingCalendar Pro | $12.99 | one-time |


## Frequently asked questions

### Is O2 Car Control free?

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

### Is RingCalendar free?

RingCalendar is free to download, with in-app purchases available.

### Do O2 Car Control or RingCalendar have ads?

Neither O2 Car Control nor RingCalendar shows ads.

### Which is updated more often, O2 Car Control or RingCalendar?

O2 Car Control ships an update every 4 months, and RingCalendar every 3 days. Most recently, O2 Car Control was updated on November 10, 2026 and RingCalendar on November 10, 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.*