# Kairos vs RoxSIM

The clearest difference is update cadence: Kairos at every 3 days against RoxSIM's weekly. RoxSIM's advantage is device support (3 vs 1). On price, ads, in-app purchases and iOS requirement there is nothing between them.

Both are free to download. Kairos sells 3 in-app purchases, starting at $4.99 per month and RoxSIM sells 5 in-app purchases, starting at $4.99 per year. Whichever you choose, the download price is not the number that matters.

Kairos ships an update every 3 days, RoxSIM weekly. The most recent releases landed on August 20, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | Kairos | RoxSIM |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 3 days** | Weekly |
| Size | 74 MB | 45 MB |
| Requires iOS | 16.4 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [HonestyVision](https://appshunter.io/developer/1804536258) | [frank vitetta](https://appshunter.io/developer/429589272) |

## What reviewers say

### Kairos

[App page](https://appshunter.io/ios/app/kairos-interval-timer/id6743784042)

**Features:** Family Sharing

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro subscription monthly | $4.99 | per month |
| Pro subscription annually | $24.99 | per year |
| Lifetime Pro subscription | $19.99 | one-time |


### RoxSIM

[App page](https://appshunter.io/ios/app/roxsim/id6755498664)

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $4.99 | per year |
| UK | $4.99 | per month |
| Pro Access | $49.99 | per year |
| Frank the Tank Unlock | $4.99 | one-time |
| Hyrox Pack Unlock | $7.99 | one-time |


## Frequently asked questions

### Is Kairos free?

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

### Is RoxSIM free?

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

### Do Kairos or RoxSIM have ads?

Neither Kairos nor RoxSIM shows ads.

### Which is updated more often, Kairos or RoxSIM?

Kairos ships an update every 3 days, and RoxSIM weekly. Most recently, Kairos was updated on August 20, 2026 and RoxSIM on September 19, 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.*