Free Tools for
Email Senders.
No signup, no email address, no trial to start. These are the checks we run internally, made public because they are more useful to you than they are proprietary to us.
SPF, DKIM & DMARC Checker
Check any domain's authentication records, see the raw values, and find out exactly what is misconfigured.
dmarc checker · spf lookup · dkim checker
Open toolEmail Spam Score Checker
Paste your copy to catch trigger phrases, shouting, link density and missing opt-out wording before you send.
spam score · spam word checker · email test
Open toolSubject Line Tester
Check length against mobile truncation, and catch the punctuation habits that make a subject read as promotional.
subject line tester · subject length checker
Open toolWhy these are free
Two of the three run entirely in your browser, so they cost us nothing to offer and nothing you type ever reaches us. The domain checker performs public DNS lookups that anyone could run themselves — we have made the output readable and explained what each finding means. None of them require an account, and none of them will ask for your email before showing a result.