# Skyresponse Alarm vs Sirio2

The clearest difference is update cadence: Skyresponse Alarm at every 2 months against Sirio2's every 16 months. 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.

Skyresponse Alarm ships an update every 2 months, Sirio2 every 16 months. The most recent releases landed on November 6, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | Skyresponse Alarm | Sirio2 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 16 months |
| Size | 37 MB | 106 MB |
| Requires iOS | **11.0** | 12.4 |
| Devices | iPhone, iPod, Apple Watch | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Skyresponse AB](https://appshunter.io/developer/639658030) | [NewPhone GmbH](https://appshunter.io/developer/1003721659) |

## What reviewers say

### Skyresponse Alarm

[App page](https://appshunter.io/ios/app/skyresponse-alarm/id639657487)

**Features:** macOS Compatibility

**In-app purchases:** none


### Sirio2

[App page](https://appshunter.io/ios/app/sirio2/id1003721660)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Skyresponse Alarm free?

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

### Is Sirio2 free?

Sirio2 is free to download, with no in-app purchases.

### Do Skyresponse Alarm or Sirio2 have ads?

Neither Skyresponse Alarm nor Sirio2 shows ads.

### Which is updated more often, Skyresponse Alarm or Sirio2?

Skyresponse Alarm ships an update every 2 months, and Sirio2 every 16 months. Most recently, Skyresponse Alarm was updated on November 6, 2026 and Sirio2 on November 1, 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.*