# ISC DNS Checker vs Dynu

The clearest difference is review sentiment: Dynu at 43% against ISC DNS Checker's 0%. Dynu also leads on update cadence (monthly vs every 15 months). ISC DNS Checker's advantage is iOS requirement (9.0 vs 15.0). On price, ads, in-app purchases and monetization model 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, Dynu monthly. The most recent releases landed on October 4, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | ISC DNS Checker | Dynu |
| --- | --- | --- |
| 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 | **42.9% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Monthly** |
| Monetization | Free | Free |
| Size | 19 MB | 10 MB |
| Requires iOS | **9.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Internet Systems Consortium, Inc.](https://appshunter.io/developer/1115648879) | [Dynu Systems, Inc.](https://appshunter.io/developer/1481158786) |

## 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


### Dynu

[App page](https://appshunter.io/ios/app/dynu/id1481158787)

Manage your dynamic DNS service and other account features on the go. This utility automatically detects IP address changes and updates your domain name mapping. It supports both IPv4 and IPv6 updates, making it essential for maintaining your dynamic DNS service.

**Highlights:** Dynamic DNS service management, Automatic IP address detection, IPv4 and IPv6 updates, Domain name mapping, Group support

**Features:** macOS Compatibility, Vision Pro support

**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 Dynu free?

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

### Do ISC DNS Checker or Dynu have ads?

Neither ISC DNS Checker nor Dynu shows ads.

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

ISC DNS Checker ships an update every 15 months, and Dynu monthly. Most recently, ISC DNS Checker was updated on October 4, 2026 and Dynu on September 21, 2026.

---

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