# AlertISIMO vs DNS Speed Tester

The clearest difference is device support: DNS Speed Tester at 4 against AlertISIMO's 2. On price, update cadence, ads and in-app purchases there is nothing between them.

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

AlertISIMO ships an update every 9 days, DNS Speed Tester every 10 days. The most recent releases landed on September 29, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | AlertISIMO | DNS Speed Tester |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 10 days |
| Size | 20 MB | 6 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Xelandru Software SRL](https://appshunter.io/developer/1786756154) | [Vishnu Nampoothiri UK](https://appshunter.io/developer/1579499876) |

## What reviewers say

### AlertISIMO

[App page](https://appshunter.io/ios/app/alertisimo/id6739729575)

**Features:** macOS Compatibility

**In-app purchases:** none


### DNS Speed Tester

[App page](https://appshunter.io/ios/app/dns-speed-tester/id6775122153)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AlertISIMO free?

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

### Is DNS Speed Tester free?

DNS Speed Tester is free to download, with no in-app purchases.

### Do AlertISIMO or DNS Speed Tester have ads?

Neither AlertISIMO nor DNS Speed Tester shows ads.

### Which is updated more often, AlertISIMO or DNS Speed Tester?

AlertISIMO ships an update every 9 days, and DNS Speed Tester every 10 days. Most recently, AlertISIMO was updated on September 29, 2026 and DNS Speed Tester on September 17, 2026.

---

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