ISC DNS Checker vs Dynu
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ISC DNS Checker
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.
- Tests DNSSEC compliance
- Tests EDNS(0) conformance
- Automatic DNS server detection
- Manual IP address input
- IPv4 and IPv6 support
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Deployment of important new DNS features such as DNSSEC relies on end users having access to DNS resolvers which behave correctly per the specifications. This app, from ISC Research, tests recursive DNS servers for conformance against current DNS protocol specifications, especially with regard to EDNS(0) as specified in RFC 6891. The app can automatically detect the DNS servers automatically discovered by your iOS device, or you can enter IP addresses to be tested manually. Both IPv4 and IPv6 are supported. Please send comments and questions to bind-users@lists.isc.org (email list subscription required)
Dynu
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.
- Dynamic DNS service management
- Automatic IP address detection
- IPv4 and IPv6 updates
- Domain name mapping
- Group support
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The Dynu iOS App allows users to manage their dynamic DNS service as well as other services with an easy-to-use mobile application. The IP Update Client utility in the app detects any changes to your IP Address and reports it to Dynu DNS servers so that your domain name keeps mapped to the dynamic IP address. This application supports IPv4 and IPv6 updates as well as group and is an essential part of the dynamic DNS service.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ISC DNS Checker | Dynu |
|---|---|---|
| Price | Free | Free |
| Rating | 3.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | 42.9% of reviews — better |
| Number of ratings | 1 — better | — |
| Update frequency | Every 15 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 19 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Internet Systems Consortium, Inc. | Dynu Systems, Inc. |
Customer experience
ISC DNS Checker
Dynu
In-app purchases
ISC DNS Checker
No in-app purchases
Dynu
No in-app purchases
