# O vs KSB Select & Compare

O and KSB Select & Compare are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

O ships an update every 6 weeks, KSB Select & Compare monthly. The most recent releases landed on October 12, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | O | KSB Select & Compare |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Size | 40 MB | 41 MB |
| Requires iOS | 12.0 | **11.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [HUTCHINSON](https://appshunter.io/developer/862345826) | [KSB SE & Co. KGaA](https://appshunter.io/developer/533763415) |

## What reviewers say

### O

[App page](https://appshunter.io/ios/app/o-ring/id1229032846)

**Features:** macOS Compatibility

**In-app purchases:** none


### KSB Select & Compare

[App page](https://appshunter.io/ios/app/ksb-select-and-compare/id1321997179)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is O free?

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

### Is KSB Select & Compare free?

KSB Select & Compare is free to download, with no in-app purchases.

### Do O or KSB Select & Compare have ads?

Neither O nor KSB Select & Compare shows ads.

### Which is updated more often, O or KSB Select & Compare?

O ships an update every 6 weeks, and KSB Select & Compare monthly. Most recently, O was updated on October 12, 2026 and KSB Select & Compare on October 20, 2026.

---

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