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Dynu vs Duck DNS: catalog facts
Dynu	Duck DNS
Freemium Dynamic DNS is free; domains, email, SSL certificates and VPS hosting are paid.	Free Free to use; supported by donations through Patreon.
Web	Web
Free dynamic DNS tier Documented IP update protocol and API	No paid tiers Simple, documented update mechanism
Many services beyond basic DDNS are paid Requires creating an account	Limited to the service's own subdomains Few features beyond basic dynamic DNS
Downloadable app, Hosted service	Hosted service
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Needs internet
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.