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Dynu vs Cloudflare DDNS: catalog facts
Dynu	Cloudflare DDNS
Freemium Dynamic DNS is free; domains, email, SSL certificates and VPS hosting are paid.	Free The open-source tool is available without a license fee.
Web	Linux, Self-hosted, Command line
Free dynamic DNS tier Documented IP update protocol and API	Handles IPv6 as well as IPv4 records Tiny container with one configuration file
Many services beyond basic DDNS are paid Requires creating an account	Cloudflare-specific; it does not work with other DNS providers Requires an API token with DNS edit permission
Downloadable app, Hosted service	Self-hosted
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 22, 2026

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