Best Free AI SEO Tools
Every tool on this page has a free tier, and the honest thing to say up front is that they are not equivalent. Two are real working allowances. Two are single-use demos. And the two biggest names give you a free account that mostly shows you your own site, which is useful but is not free SEO software. What follows is what each one actually lets you do before it stops.
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What "free" means on each of these
Ahrefs and Semrush are the names people come here for, and their free tiers are the most limited. Ahrefs' free access is built around verifying your own site — genuinely useful for finding your own broken links and technical issues, and not a way to research competitors. Semrush's free account caps you at a handful of searches a day. Both are best understood as a look at the product rather than a plan to work on.
SEO Writing AI gives you three articles with no card required. That is a real trial of the actual output, which is the thing you want to judge, and then it stops.
AI Overview Optimizer allows one audit a month, but across all eleven of its dimensions. One full audit monthly is a genuinely usable cadence if you are working on a single site.
Junia AI and MarketMuse both offer free entry points. MarketMuse's is the more interesting of the two, because its whole value is analysing your existing content inventory, and you can see whether that analysis says anything useful about your site before paying.
The one that is free in a different way
If your goal is finding technical problems on a site you own, Ahrefs' free tier does that properly and indefinitely. It is the only thing on this page that is a permanent free working tool rather than a sample, and it is worth setting up whatever else you choose.
What to expect when the free tier runs out
The jump is steep and uneven. AI Overview Optimizer starts at $9/mo promotional, SEO Writing AI at $19, Junia at $17, Ahrefs at $29. Semrush is $139/mo for its SEO plan, which is a different category of commitment. MarketMuse does not publish a price at all, so budgeting for it means a sales conversation first.
Work out which one you would pay for before the trial ends, because the free tiers are short enough that the decision arrives quickly.
Common questions
Is Ahrefs actually free?
It has a free tier, but it is built around verifying and auditing a site you own rather than researching competitors. For finding technical issues on your own site it is genuinely useful and permanent. For keyword and competitor research you need a paid plan, from $29/mo.
Which free tier lets me do the most real work?
AI Overview Optimizer's one full audit a month across all eleven dimensions is the most usable ongoing allowance if you are working on a single site. SEO Writing AI's three free articles are the best way to judge actual output quality.
Do any of these need a credit card?
SEO Writing AI explicitly does not for its three free articles. Check each of the others at signup, since this is the detail most likely to have changed since we last reviewed them.
What is the cheapest paid plan here?
AI Overview Optimizer at $9/mo on its promotional Starter rate, then Junia AI at $17 and SEO Writing AI at $19. Semrush at $139/mo is the outlier and is aimed at a different buyer.