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