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33Mail vs Guerrilla Mail: catalog facts
33Mail	Guerrilla Mail
Best for: Disposable email forwarder offering unlimited free aliases	Best for: One-off signups where you do not want to give your real email address
Free Free for unlimited aliases on the 33mail subdomain.	Free + paid options Disposable addresses are free; using your own domain costs 9.99 USD per year.
Web	Web
Unlimited free aliases on the service's subdomain Simple to create a new alias on demand for any signup	No signup; address is ready immediately Choice of several domains All 4 strengths for Guerrilla Mail No signup; address is ready immediately Choice of several domains Can send as well as receive Has a public API
Aliases live on 33mail's shared subdomain rather than a custom domain on the free tier Long-running service with a dated interface compared to newer alternatives	No encryption; inboxes are not private Many sites block its domains
Web application	Web application
Not open source	Not open source
License not stated	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Sources for 33Mail 33mail.com Catalog checked September 22, 2026	Official website Full listing and sources Sources for Guerrilla Mail guerrillamail.com Catalog checked September 23, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.