Tools

Free newsletter tools

Small, honest tools for newsletter writers. They run in your browser and never pretend to test things they cannot.

Free tool

Subject line tester

Length, phone truncation, spam-trigger phrases, shouting and preview text, checked as you type.

Runs in your browserFree tool

Email deliverability checker

Live public DNS check of SPF (with the 10-lookup count), DKIM, DMARC and MX, plus the full checklist.

Runs in your browser