Best Free SEO Tools in 2026 (Tested Limits, Not Trials)
Type “best free SEO tools” into a search bar and most of the results mix two very different things together: tools that are free forever and tools that offer a trial and then start charging. Semrush shows up on plenty of these lists because it has a trial period, not because any part of it stays free once that trial ends.
This comparison separates the two categories cleanly, states the exact caps on each genuinely free tool, such as Screaming Frog’s 500 URL crawl limit and Ubersuggest’s three searches a day and points out where a tool that looks free is actually restricted in a way that matters, like Ahrefs Webmaster Tools only covering sites you can verify you own.
The Free-Versus-Trial Confusion in Most SEO Tool Lists
A lot of “free SEO tools” content treats a 7-day or 14-day trial as equivalent to a free tier, because both let you use the software without entering a card at that exact moment. They are not the same thing. A trial has an expiration date built in. A genuinely free tier, like the ones covered below, does not stop working after a set number of days.
That distinction matters most for anyone choosing a tool to rely on long-term rather than for a one-time audit. This comparison only counts a tool as free if some part of it keeps working indefinitely without payment and says so explicitly when a well-known name is trial-only instead.
Which Tools Made This List and Why
Six tools are covered here: Google Search Console, Ahrefs Webmaster Tools, Screaming Frog SEO Spider, Ubersuggest, Google Keyword Planner and Bing Webmaster Tools. Each one has at least one component that works indefinitely without payment and each was checked against its current documentation or app listing rather than an older roundup.
Semrush, Moz Pro and most other all-in-one SEO suites are deliberately left out of the main comparison because none of them currently offer a permanent free tier, only trial periods of a week or two, which puts them in a different category from the tools below.
Free vs. Trial at a Glance
| Tool | Free Tier Type | Exact Limit | Best For |
| Google Search Console | Permanent, unlimited | None; 16-month data window on performance reports | Indexing status, search performance, manual actions |
| Ahrefs Webmaster Tools | Permanent, restricted | Only for sites you can verify ownership of | Site audit and backlinks for your own site |
| Screaming Frog SEO Spider | Permanent, capped | 500 URLs per crawl | Technical audits on small to mid-size sites |
| Ubersuggest | Permanent, capped | 3 searches per day | Occasional keyword and content ideas |
| Google Keyword Planner | Permanent, requires Ads account | Full search volume data behind an active ad spend | Rough keyword volume estimates |
| Bing Webmaster Tools | Permanent, unlimited | None | Bing-specific indexing, keyword and backlink data |
Google Search Console: The Only Genuinely Unlimited Free Tool Here
Google Search Console has no paid tier at all, which makes it the one tool on this list with zero asterisks. It shows which pages are indexed, flags manual actions and mobile usability issues and reports actual search performance data including queries, pages, countries and devices. According to Google’s own Search Console documentation, the Performance report keeps roughly 16 months of historical data, which is worth knowing if you plan to compare year-over-year traffic later and want to export data before it ages out.
The tradeoff is that Search Console only reports on sites you control and verify, so it is not a research tool for looking at competitors, only a monitoring tool for your own site.
Ahrefs Webmaster Tools: Free, But Only for Sites You Own
Ahrefs Webmaster Tools is a genuinely free, separate product from the paid Ahrefs suite and it includes a real site audit with roughly 5,000 crawl credits per verified project each month, plus visibility into up to 1,000 backlinks and 1,000 keywords at a time for that site.
The catch, which several comparison articles gloss over, is the word “verified”: this free tool only works on domains you can prove ownership of. You cannot point it at a competitor’s site to research their backlink profile or keyword rankings; that kind of competitive research still requires a paid Ahrefs subscription.
Screaming Frog SEO Spider: Free Up to Exactly 500 URLs
Screaming Frog’s desktop crawler is free with no time limit and no account required but it caps each crawl at 500 URLs. For a small business site or a single landing page’s technical audit, that ceiling rarely gets hit. For anything larger, a paid license (roughly £199 a year) removes the cap entirely and adds JavaScript rendering and scheduling.
Because the 500 URL limit is per crawl rather than a lifetime total, it is possible to work around it in stages on a larger site by crawling specific subfolders separately, though that gets tedious past a certain site size.
Ubersuggest: Three Searches a Day, No Credit Card Required
Ubersuggest’s free tier allows three searches per day, resetting every 24 hours, covering basic keyword suggestions, a simplified site audit and rough competitor traffic estimates. That is enough for occasional use, checking a handful of keyword ideas before writing a page but not enough for daily research across many pages or clients.
Ubersuggest also sells paid plans and lifetime-access deals that remove the daily cap, which is worth knowing since some readers assume the free version has no restriction until they hit it mid-project.
Google Keyword Planner and Bing Webmaster Tools
Google Keyword Planner is free to use with a Google Ads account but the exact search volume numbers are only shown in full once an account has active ad spend; without it, volumes are shown as broad ranges rather than specific figures. It remains useful for rough keyword ideas and seasonal trend data even without spending on ads.
Bing Webmaster Tools is a genuinely unlimited free tool that mirrors much of what Search Console does for Bing specifically, including indexing reports, a keyword research tool and backlink data. It gets skipped in most comparisons despite having no caps at all, likely because Bing’s search share is smaller than Google’s, not because the tool itself is limited.
Free Browser Extensions Worth Adding Alongside These Tools
MozBar remains genuinely free as a browser extension, showing Domain Authority, Page Authority and a basic spam score directly over search results once you log in with a free Moz account. It also highlights on-page elements like headings and meta tags while browsing any page, which makes quick competitor checks faster than switching to a separate tool. Advanced link analysis and expanded metrics still require a paid Moz Pro plan but the SERP overlay itself costs nothing ongoing.
Keywords Everywhere is worth mentioning specifically because it used to be a free extension and no longer is. It switched to a paid, credit-based model years ago and several older “best free SEO tools” articles still list it as free simply because that used to be true. Checking a tool’s current pricing page before repeating an old claim applies just as much to browser extensions as it does to full platforms.
Where AI-Powered Free SEO Tools Actually Fit In
Search volume for “best free AI SEO tools” has grown quickly, largely driven by tools that draft meta descriptions, cluster keywords automatically or check how a page might appear in an AI-generated answer rather than a traditional search result. Most of these AI-branded tools follow the same trial-then-paid pattern as Semrush rather than offering a lasting free tier, since the underlying AI model calls cost the provider money per use.
The exception is that several of the traditional free tools above have added AI-assisted features at no extra cost: Ubersuggest’s content ideas feature and some of Ahrefs Webmaster Tools’ audit explanations now use AI-generated summaries within their existing free limits. Treat a tool’s “AI-powered” label as marketing language rather than a reason to expect a better free tier than the plain version offered.
Matching a Free Tool to the Job: Audit, Keywords or Rank Tracking
For a technical audit of your own site, Screaming Frog covers on-page issues up to 500 URLs and Ahrefs Webmaster Tools adds server-level crawl data and backlink visibility for the same verified site, so running both together covers more ground than either alone. For keyword research on a budget, Ubersuggest’s three daily searches and Google Keyword Planner’s ad-account-gated volumes work best combined, since neither alone gives a complete picture.
For ongoing monitoring rather than one-time research, Google Search Console and Bing Webmaster Tools are the only two tools here built to be checked weekly without ever running into a usage cap, which makes them the right default even though neither one does keyword research or competitor analysis.
When Free Tools Stop Being Enough
Every tool in this comparison earns its place on a genuinely free tier but stacking six separate tools together to compensate for each one’s caps has a real cost too: the time spent switching between them, exporting data manually and reconciling numbers that do not always agree between Ahrefs Webmaster Tools and Google Search Console. For a single small site, that tradeoff is easily worth it. For an agency managing a dozen client sites or a site large enough that Screaming Frog’s 500 URL cap gets hit on every crawl, the hours spent working around free-tier limits start costing more than a paid subscription would.
There is no fixed traffic number or site size where that switch makes sense for everyone. A reasonable signal is noticing that the same limit gets hit on nearly every project: repeatedly needing to crawl a site in batches to stay under 500 URLs or running out of Ubersuggest searches before finishing a single client’s keyword list. At that point, a paid tool is not replacing something broken; it is buying back time that free tools were quietly costing already.
FAQs
What is the best completely free SEO tool with no limits?
Google Search Console and Bing Webmaster Tools are the only two tools in this comparison with no usage caps at all, though both are restricted to monitoring sites you already control rather than researching competitors.
Is Semrush actually free?
No. Semrush offers a trial period, typically a week or two, rather than a permanent free tier. Once the trial ends, continued use requires a paid subscription.
How many URLs can Screaming Frog crawl for free?
Screaming Frog SEO Spider’s free version crawls up to 500 URLs per crawl with no time limit. A paid license removes that cap entirely.
Can I use Ahrefs Webmaster Tools to check a competitor’s site?
No. Ahrefs Webmaster Tools only works on sites you can verify ownership of. Researching a competitor’s backlinks or keywords requires a paid Ahrefs subscription instead.
Are AI-powered SEO tools ever free?
Most standalone AI-branded SEO tools follow a trial-then-paid model because AI model calls cost the provider money. Some traditional free tools, like Ubersuggest and Ahrefs Webmaster Tools, have added AI-assisted features within their existing free limits instead.
What is the best free SEO tool for keyword research?
Ubersuggest and Google Keyword Planner are the most useful free options, though Ubersuggest caps at three searches a day and Keyword Planner shows full volume numbers only with an active Google Ads account.
Conclusion
No single tool on this list replaces a paid SEO suite entirely but together they cover more ground than most people expect from anything free. Google Search Console and Bing Webmaster Tools handle ongoing monitoring without limits, Screaming Frog and Ahrefs Webmaster Tools cover technical and backlink audits within their caps and Ubersuggest fills in keyword research a few searches at a time.
The main thing worth remembering from this comparison is the difference between a free tier and a trial: if a tool’s marketing does not say what happens after day 7, assume it stops working for free at that point. If you found this useful alongside our roundup of SaaS tools for startups, the same free-versus-trial check is worth applying before adding any new tool to a small team’s stack, not just SEO software.
For a lighter break between audits, BratGen’s quick text tools are worth a look too, since a five-minute distraction between crawl reports rarely hurts.
