# ISC DNS Checker vs DNS Mail Info

The clearest difference is update cadence: DNS Mail Info at every 2 days against ISC DNS Checker's every 15 months. ISC DNS Checker's advantage is iOS requirement (9.0 vs 18.0). 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.

ISC DNS Checker ships an update every 15 months, DNS Mail Info every 2 days. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | ISC DNS Checker | DNS Mail Info |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (1 ratings)](https://appshunter.io/ios/app/isc-dns-checker/id1141834002/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 19 MB | 3 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Internet Systems Consortium, Inc.](https://appshunter.io/developer/1115648879) | [BEHR Consulting International](https://appshunter.io/developer/385816833) |

## What reviewers say

### ISC DNS Checker

[App page](https://appshunter.io/ios/app/isc-dns-checker/id1141834002)

This application tests recursive DNS servers for compliance with current DNS protocol specifications, particularly EDNS(0). It can automatically detect your device's DNS servers or allow manual IP address input for testing. Both IPv4 and IPv6 are supported.

**Highlights:** Tests DNSSEC compliance, Tests EDNS(0) conformance, Automatic DNS server detection, Manual IP address input, IPv4 and IPv6 support

**Features:** macOS Compatibility

**In-app purchases:** none


### DNS Mail Info

[App page](https://appshunter.io/ios/app/dns-mail-info/id6484502460)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ISC DNS Checker free?

ISC DNS Checker is free to download, with no in-app purchases.

### Is DNS Mail Info free?

DNS Mail Info is free to download, with no in-app purchases.

### Do ISC DNS Checker or DNS Mail Info have ads?

Neither ISC DNS Checker nor DNS Mail Info shows ads.

### Which is updated more often, ISC DNS Checker or DNS Mail Info?

ISC DNS Checker ships an update every 15 months, and DNS Mail Info every 2 days. Most recently, ISC DNS Checker was updated on November 2, 2026 and DNS Mail Info on October 25, 2026.

---

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