When comparing FreeDNS vs Dynu, the Slant community recommends FreeDNS for most people. In the question“What are the best free dynamic DNS services? ” FreeDNS is ranked 1st while Dynu is ranked 3rd. The most important reason people chose FreeDNS is:
Allows using own domain names.
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Pros
Pro Supports custom domain
Allows using own domain names.
Pro Huge list of domains to choose from
There are over 90,000 domains that can be used.
Pro Includes url/port forwarding
Their built-in Web Forward system allows redirecting URLs (including to a different port).
Pro Free client software for different operating systems
Free IP Update client software for Windows, Mac OS X and Linux is available.
Pro Supports custom domains
Allows using own domain names.
Pro Advanced DNS records supported
Various DNS records can be setup for your domain name including A, AAAA, MX, SPF, SRV, DKIM, TXT, PTR, HINFO records etc.
Pro Offline settings
Option to redirect to a URL or display offline message.
Pro Thorough setup instructions on different routers and operating systems
Dynu provides thorough setup instructions on different routers and operating systems. Everything is explained in a detailed and understandable way even for beginners.
Pro Includes url/port forwarding
Their service includes a system for redirecting URLs (including to a different port).
Pro Extremely fast IP updates due to user controlled TTL
Pro Super fast DNS propagation
Pro Custom nameserver records for sub-domain names
If your domain name uses their nameservers, you can set up other nameserver records for your sub-domain names if you want to use those sub-domain names with other hosting providers. This kind of flexibility does not exist anywhere else.
Pro Custom DNS records for your own domain name
Dynu allows you to manage DNS records for your domain name for free. Supported DNS records include A, AAAA, MX, SRV, TXT, SPF, NS, HINFO, CNAME etc.
Cons
Con Using a custom domain for free gives everyone access to it
FreeDNS shares all custom domains used across all users, if you're using the free mode. Premium membership allows you to keep your TLD private.
Con Some features are only available if you get a paid membership
You do get to use all features of Dynu services with a free account. But if you need to use say 300 hostnames, you may need to pay $9.99/year membership fee. Usually, a free account is more than enough.