Email the list you already have, without standing up a stack.
Open Mailchimp
Free options · 4.1 rating
Ahrefs
Keyword research, backlinks and content gaps without the mystery dashboard.
Paid · 4.5 rating
Ahrefs is a serious SEO suite: who links to whom, what they rank for, and where you have a gap. Pricey for a solo freelancer; correct when organic search is a channel you would miss if it died.
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Added 16 October 2025. Listed under Best marketing and SEO tools for growing sites.