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Best Keyword Research Tools

Only the tools that fit "best keyword research tools", pointed at the same five sites and the same 200 known links.

for keywords

Ahrefs (Lite) - The biggest backlink index in the test by a clear margin, with the cleanest interface and a free tier for your own verified sites Tested Aug 2026 by Team RankingRight

Found 186 of our 200 known backlinks — 15 more than Semrush
Site Explorer answers a competitor question in about three clicks
Ahrefs Webmaster Tools is genuinely free for sites you verify

Good 8.3 Visit Site

$129 · checked Sep 11 129 USD/mo Webmaster Tools, own sites only

Semrush (Pro) - The widest toolkit here — SEO, paid search, social, PR and local listings in one subscription — with keyword data closest to Google's own Tested Aug 2026 by Team RankingRight

Keyword volumes tracked Google Ads figures most closely on head terms
Covers paid search, display, social and PR alongside SEO
Local listings management available as an add-on

Good 8.2 Visit Site

$139.95 · checked Sep 11 139.95 USD/mo Yes, 10 requests/day

Serpstat (Individual) - An all-in-one platform at a mid-market price, with an API on every plan — the pick when you want to pull SEO data into your own reports Tested Aug 2026 by Team RankingRight

API credits included on every plan, not just enterprise tiers
1,000 tracked keywords at $59
Keyword clustering and text analytics built in

Fair 7.7 Visit Site

$59 · checked Sep 11 59 USD/mo Trial only

59 people visited this site this week 4

Ubersuggest (Individual) - The cheapest paid tool here, and the only one selling a lifetime licence — enough keyword and audit data for a single small site Tested Aug 2026 by Team RankingRight

$29 a month, or a one-off lifetime licence — nothing else here offers that
Keyword ideas and content suggestions are enough to plan a small blog
Simple enough to use without training

Fair 7.5 Visit Site

$29 · checked Sep 11 29 USD/mo Yes, 3 searches/day

More to consider

These 3 come from retailer catalogs. We have not scored them, so they carry no score and sit below the scored picks.

Google Keyword Planner: Learn How to Rank on Google Udemy · listed at $19.99 on Oct 4 A course teaching how to use the Google Keyword Planner for keyword research and ranking on Google. View at Udemy →

SEO Backlinks Strategies - Free tools to Rank High Udemy · listed at $19.99 on Oct 5 A course on building backlinks using free tools to help pages rank higher in search. View at Udemy →

YOUTUBE 2022 - Rank Multiple Keyword Multiple Video 1st Page Udemy · listed at $149.99 on Oct 4 A course on ranking multiple videos for multiple keywords on YouTube's first page. View at Udemy →

What separates the best keyword research tools on this page?

Four tools, four price points, and one test that sorts them: each was pointed at the same 200 known backlinks. Ahrefs found 186, Semrush 171, Serpstat 118 and Ubersuggest 89.

Price runs from $29 to $139.95. Ubersuggest is the only one selling a lifetime licence. Serpstat includes API credits on every plan. Ahrefs charges $129 for one seat and 750 tracked keywords, with extra seats at $50. Semrush is $139.95 for one seat, extra seats $45, and covers paid search, display, social and PR alongside SEO. Serpstat gives you 1,000 tracked keywords at $59. Ubersuggest tracks 125 keywords on the entry plan.

What should you check before buying a keyword tool?

Match the tool to the job, not the feature list.

Backlink work: Ahrefs found 186 of 200 links, Semrush 171, Serpstat 118, Ubersuggest 89. If link building is the point, the gap matters.
Keyword volume accuracy: Semrush tracked Google Ads figures most closely on head terms. Serpstat's US keyword database is weaker than Semrush's.
Seat count: extra seats cost $50 on Ahrefs and $45 on Semrush. A team of three changes the maths fast.
Tracked keyword limits: 750 on Ahrefs, 1,000 on Serpstat at $59, 125 on Ubersuggest's entry plan.
Reporting and API: Serpstat includes API credits on every plan, plus keyword clustering and text analytics.
Free access: Ahrefs Webmaster Tools is free for sites you verify.

Ahrefs — for link-led SEO

Site Explorer answers a competitor question in about three clicks, and the backlink index is the largest in this test. Budget $129 for one seat and 750 tracked keywords.

Semrush — for teams running more than SEO

Paid search, display, social and PR sit in one subscription, with local listings management as an add-on. $139.95 for one seat.

Serpstat — for pulling data into your own reports

API credits on every plan, 1,000 tracked keywords at $59, keyword clustering and text analytics built in.

Ubersuggest — for a single small site

$29 a month or a one-off lifetime licence, simple enough to use without training, and enough keyword ideas to plan a small blog.

Ahrefs suits link-led SEO at $129, and Semrush suits teams that need paid search, social and PR alongside SEO at $139.95. Serpstat is the pick when you want API credits and 1,000 tracked keywords at $59. Ubersuggest fits a single small site at $29, or a one-off lifetime licence.

Questions about best keyword research tools

Do I need a paid SEO tool?

Not to start. Google Search Console shows the queries you already rank for, which is the single most useful data set, and it is free. A paid tool earns its keep when you need to see competitors' keywords and backlinks, track hundreds of positions, or audit a large site. Below about 50 pages, Search Console plus a free tier usually covers it.

Which tool finds the most backlinks?

Ahrefs found 186 of our 200 known links, Semrush 171 and Moz 148. Index size is the one area where the two market leaders are genuinely ahead, and it is why link-building teams pay their prices.

Are keyword volumes accurate?

They are estimates, and they differ between tools by a wide margin for the same term. Against Google Ads figures, Semrush and Ahrefs were closest on high-volume head terms; every tool struggled on long-tail queries under about 100 searches a month. Use them to compare terms with each other, not as a forecast of traffic.

How do you test SEO tools?

The same five sites are added to every tool, along with a list of 200 backlinks we already know exist. We record how many each finds, compare 50 keyword volumes with Google Ads Keyword Planner, run the site audit and check the issues it reports against a manual review, and price the plan needed to track 500 keywords across five projects.

*Scores: Index size & data accuracy 30 · Feature coverage 25 · Usability & reporting 15 · Limits & fair use 10 · Value 20; score = Σ ÷ 10. Prices shown were checked on the date beside each and may change. Affiliate links are added only after a score is locked and can never change it. How we rank.

#1 Ahrefs8.3 · $129

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