SEO Tools & Software

The best keyword research tools, sorted by budget

The best keyword research tools range from completely free, the SERP itself plus Google Keyword Planner, to paid databases like Semrush and Ahrefs that start around $99 to $140 a month. This page ladders all of them by budget, with the free keyword research tools first, because that free loop is literally how this site was planned. Framed on documented features and published pricing, not testing hours we cannot claim.

Free → paidReal free-tier limitsHonestly framed

Keyword research tools by what they are built for, documented free-tier limits, and price tier

Google Autocomplete + PAA	Seed expansion straight from the SERP	Unlimited	Free
Google Keyword Planner	Volume ranges (needs Ads account)	Unlimited	Free
Google Trends	Seasonality and relative interest	Unlimited	Free
Google Search Console	Queries you already rank for	Unlimited	Free
AnswerThePublic	Question + preposition mapping	3 searches/day	Freemium
Ubersuggest	Beginner-friendly ideas + basic metrics	Limited daily searches	Freemium
Mangools KWFinder	Budget difficulty scores, easy to read	5 lookups/day	Budget
Semrush Keyword Magic	Huge database + intent analysis	10 reports/day	Paid
Ahrefs Keywords Explorer	Competitor keywords + clicks data	Free tools only	Paid

Some links here are affiliate links: if you buy through them we may earn a commission at no extra cost to you. It never changes what we recommend.

Desk covered in sticky notes and a notebook mind map beside a laptop, keyword research tools at work

What a keyword research tool actually does

A keyword research tool is software that takes a seed term and returns related search queries with data attached: search volume, keyword difficulty, and cost per click. It exists to answer one question, which topics deserve a page, before you spend weeks writing. The free end of the category (Keyword Planner, the SERP itself) covers ideas and rough demand; the paid end (Semrush, Ahrefs) adds huge databases, difficulty scores, and competitor keyword lists.

Those three outputs do different jobs. Volume tells you whether anyone searches the term at all. Difficulty estimates how hard page one will be, mostly from the backlink strength of what ranks now. CPC hints at commercial value, because advertisers only bid on terms that convert. If SEO itself is new territory, start with what SEO is and how it works before buying anything.

Source: Google Search Central SEO Starter Guide

The tool matters less than the method

Real keyword research is a loop, not a lookup: take a seed term, expand it with autocomplete, People Also Ask, and related searches, pull volume and difficulty, group the results by intent, then map each group to one page. That is not theory. Every page on this site, including this one, was planned with exactly that loop, run on the free SERP signals before any subscription entered the picture.

Google's own SEO starter guide makes the same point from the other direction: think about the words a user might search for, and write genuinely useful pages around them. A tool cannot do that thinking for you. Once you know the loop, a tool just makes it faster: budget picks add readable difficulty scores, paid databases add scale and competitor data. Learn the method in full in how to do keyword research, then choose the tool that fits your budget below.

The free stack: keyword research at $0

Google Keyword Planner

Keyword Planner is Google's free keyword tool, built for advertisers but perfectly usable for SEO demand-checking. You need a Google Ads account to open it, and unless you are actively spending on ads it shows search volume as ranges, 1K to 10K rather than an exact figure. Most roundups skip that caveat; it matters, because a range can hide a 10x difference.

Used honestly, it still answers the core question: is there demand at all, and roughly how much. Feed it your seed terms, export the ideas list, and treat the ranges as a coarse filter rather than a ranking of winners.

Google Trends + Search Console

Google Trends shows relative interest over time, not volume, which makes it the free answer to a question no paid tool handles well: is this topic seasonal, growing, or quietly dying. Thirty seconds in Trends can save you a month of writing into a declining curve.

Search Console works the opposite end. Once your site has any history, its queries report lists the terms you already rank for, including page-two terms a small content push can lift. That is real data about your own site, not an estimate, and it is the cheapest keyword research that exists: zero cost, zero daily limits.

The SERP itself: autocomplete, People Also Ask, related searches

The search results page is a keyword tool nobody bills you for. Autocomplete shows what people type after your seed term. The People Also Ask box lists the literal questions searchers ask next. Related searches at the bottom of the page hands you sibling topics. Between them you get ideas, phrasing, and intent, straight from Google, with no account and no cap.

This is the part we can vouch for directly: the page list for this site came out of exactly these three signals, grouped by intent and mapped one group per page. What the SERP will not give you is numbers, which is where the tools below come in.

Man writing keyword ideas on index cards at a sunny table, keyword research with free tools

Freemium picks: AnswerThePublic and Ubersuggest

AnswerThePublic maps a seed term into the questions, prepositions, and comparisons people search around it, who, what, why, versus, for. Its free plan documents 3 searches per day, which sounds tight but fits how the tool is best used: one deep dive per topic, exported, then worked through offline. It shines for content ideas rather than hard data.

Ubersuggest is the cheap generalist. The free tier allows a handful of daily searches with basic volume and difficulty figures, and paid plans undercut the big databases by a wide margin. Both are fine ways to test whether the tool workflow suits you before any money changes hands; neither is built for research at scale.

Budget pick: Mangools KWFinder

KWFinder is the tool we point to when someone asks for the first paid step. Its documented free tier gives 5 keyword lookups per 24 hours with 15 related keywords per lookup, enough to feel how the difficulty scores read before subscribing. The interface is the selling point: volume, difficulty, and the live SERP for a term on one screen, without the dashboard sprawl of the all-in-ones.

Entry pricing sits roughly in the $29 to $49 a month band depending on plan and billing cycle, well under half the paid benchmarks. Check Mangools' own pricing page before deciding, prices move and we would rather you see the current number than trust a stale one here. The trade-off is scale: a 2.5-billion-keyword database and solid long-tail discovery, but lighter competitor analysis than the tools below.

The paid databases: Semrush vs Ahrefs

Semrush and Ahrefs are the category benchmarks, and for most buyers the honest comparison is close. Semrush's Keyword Magic tool leads on breadth: granular volume metrics, keyword difficulty, intent labels on every term, and automated topic clustering, with a documented free tier of 10 reports per day and paid plans from about $139.95 a month. Ahrefs' Keywords Explorer leads on competitor work: seeing exactly which keywords any domain ranks for, clicks data alongside volume, and traffic-potential estimates, with plans from around $99 a month plus limited free tools.

Here is the part the affiliate roundups soften: both are overkill for a brand-new site. Until you have content live and competitors worth dissecting, you are paying for database scale you cannot use. They earn their price for agencies, client work, and sites past the early publishing phase, when competitor keyword lists start driving the content plan. Before that point, the free stack plus a budget tool covers the actual work.

Keeping costs at zero for now? Start with the free SEO tools worth using and upgrade only when a limit bites.

Which tool for your situation

Brand-new site, $0 budget

The free stack: SERP signals for ideas, Keyword Planner for demand, Trends for seasonality. Nothing paid until you are publishing weekly. Starting a site from scratch? The same logic applies in how to start a blog that makes money.

Publishing weekly, hitting free limits

KWFinder. The 5-lookups-a-day cap is usually the first limit that genuinely hurts, and the budget tier removes it for less than the cost of the all-in-ones.

Client work or competitor-driven research

Semrush or Ahrefs. Once competitor keyword lists and rank tracking at scale drive your plan, the database is the product, and small-business options are compared in SEO software for small business.

YouTube or Amazon research

The general tools above stop at Google. Platform-specific autocomplete tools cover YouTube and Amazon suggestions; treat them as idea sources, not volume data.

PPC rather than SEO

Keyword Planner is the right tool, not a compromise: it is built for ad forecasting, and its CPC and competition data are exactly what a paid campaign needs.

Local keywords

KWFinder supports location-scoped lookups across tens of thousands of locations on its documented plans, the cheapest way to see city-level difficulty.

The middle column links: how to start a blog that makes money and SEO software for small business expand the first and third scenarios.

Printed bar chart under a magnifying loupe on a desk, understanding keyword volume and difficulty data

What the numbers actually mean

Search volume is an estimate everywhere except inside Google. Third-party tools model it from clickstream samples, so Semrush, Ahrefs, and KWFinder routinely show different volumes for the same keyword, and all three can differ from Keyword Planner's ranges. None of them is lying; they are sampling differently. Our own research data for this site showed headline volumes swinging heavily month to month, which is why we treat difficulty and intent as the more reliable signals than any single volume figure.

Keyword difficulty deserves the same scepticism. It is a 0-to-100 estimate built mostly on the backlink strength of the current top ten, and each tool computes it differently, so scores are only comparable within one tool. The sanity check that beats every score: search the keyword and read page one. If every result is a major brand, the number was academic anyway.

Can ChatGPT do your keyword research?

Partly, and the part it does, it does well. A chatbot is genuinely good at brainstorming seed terms you had not considered and at grouping a messy keyword list by intent, the two most thought-heavy steps of the loop. Asking it to cluster 100 exported terms into page groups is a real time-saver.

What it cannot do is measure demand. ChatGPT has no live search volume, no difficulty data, and no view of the current SERP, so any number it produces is a plausible-sounding guess. The pattern that works: AI for ideas and organisation, then a real data source, the free stack or one of the tools above, to check which ideas people actually type into Google. Tools that bolt AI onto real keyword databases are converging on exactly that combination.

What a week of keyword research looks like

The steady-state workflow is smaller than tool marketing suggests. One session a week covers a solo site. First, expand: take one topic, run it through autocomplete, People Also Ask, and related searches, and collect every phrasing worth a note. Second, qualify: pull volume ranges from Keyword Planner, or difficulty scores from your paid tool if you have one, and drop terms that are clearly out of reach. Third, map: group survivors by intent and assign each group to one planned page, so research ends in a publishing list rather than a spreadsheet graveyard.

The limit you hit first tells you when to upgrade. If it is idea volume, the free stack still has headroom; work the SERP harder. If it is checking difficulty on dozens of terms and rationing 5 free lookups a day, that is the moment a budget tool starts paying for itself, and not before.

Where keyword tools fit in your wider stack

A keyword tool is one part of a larger kit. Pair it with the free base every site needs, Search Console and Analytics, and reach for a full all-in-one only when backlink and rank-tracking scale becomes the bottleneck. One tool you actually open beats three subscriptions that duplicate each other's data.

The best SEO tools hub maps the whole category by budget, and if you are choosing software for a small operation, the small-business comparison above digs into value per dollar. The method stays the same at every price point: seed, expand, qualify, map, publish.

Tool deep dives

Google Keyword Planner

Google's own demand data, free with an Ads account. What the volume ranges really mean.

Read the deep dive →Google Trends

Relative interest and seasonality. The free sanity-check before you commit to a topic.

Read the deep dive →AnswerThePublic

Question and preposition maps from autocomplete. Three free searches a day.

Read the deep dive →Ubersuggest

The cheap freemium entry point. Daily free searches plus basic difficulty scores.

Read the deep dive →Mangools KWFinder

The budget pick. Readable difficulty scores without the all-in-one price tag.

Read the deep dive →Semrush

Keyword Magic, intent labels, and topic clustering. The paid benchmark for scale.

Read the deep dive →Ahrefs

Keywords Explorer plus the strongest competitor keyword data in the category.

Read the deep dive →

FAQ

Keyword research questions, answered straight

How do you do keyword research for free?

Start from a seed term and expand it using the SERP itself: Google Autocomplete, the People Also Ask box, and related searches at the bottom of the page. Pull rough demand from Keyword Planner, check seasonality in Trends, group the terms by intent, and map each group to a page. That free loop is exactly the process behind this site; paid tools speed it up but do not replace the logic.

What is the best free tool for keyword research?

Google Keyword Planner, because it is Google's own demand data at no cost. Its catch is that volumes appear as ranges unless you run ads, so pair it with the SERP signals for ideas and with Search Console for the queries you already appear for. Between those three you cover ideas, demand, and proof, all at zero spend.

Which keyword research tool is best for beginners?

For a first paid step, budget tools like Mangools KWFinder are built to be readable: difficulty scores and volumes without an overwhelming interface, and five free lookups a day to try it first. Freemium options such as Ubersuggest and AnswerThePublic let you test the workflow at no cost. Beginners rarely need a full all-in-one on day one; they need clear intent signals and a manageable dashboard.

Which keyword tool is most accurate?

None of them is exact, and the honest answer is that they disagree. Every third-party tool estimates volume from clickstream samples and its own models, so Semrush, Ahrefs, and KWFinder can show different numbers for the same term. Keyword Planner comes straight from Google but rounds into ranges. Treat every figure as directional, compare terms within one tool, and confirm by reading the actual results page.

Can I use ChatGPT for keyword research?

For brainstorming seeds and grouping terms by intent, yes, it is genuinely useful. What it cannot do is tell you demand: a chatbot has no live search volume or difficulty data, so any number it quotes is a guess. The working pattern is AI for ideas and organisation, then a real data source, free or paid, to check which of those ideas people actually search for.

Do I need a paid tool, or is Keyword Planner enough?

Keyword Planner is enough to find demand and validate ideas, especially paired with the SERP. What it will not give you is precise difficulty scoring, competitor keyword lists, or a big searchable database, and its volumes come as ranges. If you research at scale or study competitors closely, a paid database earns its cost; otherwise the free route holds up well.

How many keyword tools do I actually need?

One is usually plenty. The free Google stack plus the SERP covers research for a small site; add a single budget or paid tool when you want faster difficulty scoring and competitor data. Stacking several subscriptions mostly duplicates data. Pick the one whose interface you will actually open, and put the saved money into publishing.

What is keyword difficulty and can I trust it?

Keyword difficulty is a tool's estimate, usually 0 to 100, of how hard it is to rank on page one, based mostly on the backlink strength of current results. It is directional, not gospel: different tools score the same term differently. Use it to compare terms within one tool, then sanity-check by actually looking at who ranks and whether you can realistically compete.

Start free, upgrade when a limit bites

The ladder in one line: SERP signals and Keyword Planner at $0, KWFinder when daily caps slow you down, Semrush or Ahrefs when competitor data drives the plan. Next step is running the loop itself, laid out in our keyword research method. Building an SEO tool and want to reach this audience? See how to advertise with SideIncomeHQ, every placement disclosed.