When comparing Dynu vs Duck DNS, the Slant community recommends Duck DNS for most people. In the question“What are the best free dynamic DNS services? ” Duck DNS is ranked 2nd while Dynu is ranked 3rd. The most important reason people chose Duck DNS is:
Duck DNS includes step by step instructions on how to set up their service on a wide variety of operating systems. There even are instruction on how to set it up on raspberry pi, mikrotik routers, tomatoUSB as well as multiple ways for Linux, Windows and OSX.
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Pros
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.
Pro Detailed setup instructions for a wide variety of OSs
Duck DNS includes step by step instructions on how to set up their service on a wide variety of operating systems. There even are instruction on how to set it up on raspberry pi, mikrotik routers, tomatoUSB as well as multiple ways for Linux, Windows and OSX.
Pro DuckDNS sync app for Android
Cons
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.
Con Lacks advanced functionality
In an effort to focus on simplicity, Duck DNS lacks features such as custom domains, url or port forwarding and uses just 1 domain.
Con Difficult to use on some routers and NVRs
Routers and NVRs that give you set options (that don't include Duck DNS) won't work with Duck DNS. Apparently Duck DNS claims they support DynDNS or something of the sort, but the information it gives you, there's nowhere to plug it in in these boxes.