Best AI for Keyword Research

The 3 that fit

Perplexity

By PerplexitySan Francisco, United States1 product across 3 categories

Built for this. Purpose-built for cited web answers. Every claim carries a numbered link, and Comet extends it across normal browsing.

Free plan: Yes; Free tier with citations in every answer, basic AI models and limited daily use
Month to month: $20/mo; Pro
Billed yearly: —; No yearly price published

Watch out: A citation proves a source was consulted, not that it supports the sentence attached to it. Click through on anything that matters.

All plans (6)

Plan	Price	What you get
Free	$0	Free tier with citations in every answer, basic AI models and limited daily use
Pro	$20/mo	deep research, top AI models, expanded Computer access, 4,000 bonus credits
Max	$200/mo	expert-level research, frontier models, 35,000 bonus credits and 10,000 monthly credits
Enterprise Pro	$34/mo yearly	no training on your data, SSO, SOC 2 Type II, HIPAA and GDPR compliance, 500 Computer credits a seat
Enterprise Max	$271/mo yearly	the most advanced reasoning models, 15,000 Computer credits a seat, SCIM and audit logs
Additional security and governance	Custom	role-based access control, custom retention, volume discounts

Open Perplexity Pricing and company Prices checked 4 September 2026

ChatGPT

By OpenAISan Francisco, United States3 products across 8 categories

Built for this. Fastest for volume — ad variants, subject lines, content calendars, scripts — with image generation in the same window.

Free plan: Yes; Ad supported; unlimited everyday text chats, limited image creation, memory and voice
Month to month: $8/mo; Go
Billed yearly: —; No yearly price published

Watch out: Output has recognisable patterns that audiences increasingly clock. Edit before publishing.

All plans (6)

Plan	Price	What you get
Free	$0	Free tier, ad supported; unlimited everyday text chats, limited image creation, memory and voice
Go	$8/mo
Plus	$20/mo	advanced models, higher quality image creation, Work agent, Codex, 20GB of storage
Pro	$100/mo
Business standard seat	$25/mo · $20/mo yearly
Business premium seat	$125/mo · $100/mo yearly	5x the usage and no five-hour limit

Open ChatGPT Pricing and company Prices checked 4 September 2026

Surfer SEO

By SurferWrocław, Poland1 product across 1 category

Built for this. Scores a draft against what already ranks for a term, and says which sections and phrases are missing. Built around the editor rather than a report.

Free plan: No; Paid from the start
Month to month: $119/mo; Standard
Billed yearly: $99/mo; Standard plan −17%

Watch out: It optimises for resemblance to current winners, which is a floor rather than a ceiling. Paid from the start, and the entry plan is not cheap.

All plans (4)

Plan	Price	What you get
AI Search Analytics	$185/mo · $158/mo yearly	tracks brand visibility across ChatGPT, Gemini and AI Overviews, 100 AI prompts refreshed daily, mention gap and brand sentiment
Standard	$119/mo · $99/mo yearly	30 documents to create or optimise, 25 AI prompts refreshed weekly, brand knowledge
Pro	$219/mo · $182/mo yearly	50 AI prompts refreshed daily, 5 brand spaces, more integrations
Peace of Mind	$359/mo · $299/mo yearly	unlimited documents and brand spaces, 100 AI prompts refreshed daily, API access and VIP support. There is no free plan, only a free start

Open Surfer SEO Pricing and company Prices checked 4 September 2026

Marketing pages

More specific “Best AI” pages for marketing-shaped work.

Best AI for Marketing Analytics

Formulas, reporting and checking the numbers

Best AI Marketing Tools

Brand voice, campaigns and the content calendar

Best AI for SEO

Briefs, on-page work and what already ranks

Best AI for Social Media

Posts, scheduling and a week of assets

Best AI for Content Marketing

Calendars, repurposing and keeping a schedule fed

Best AI for Email Marketing

Subject lines, variants and sequences

Best AI for Market Research

Sizing, competitors and findings with sources attached

Best AI for Lead Generation

Contact data, research and the first message

Best AI for Marketing

Every tool in the category most of these come from.

Every AI tool we track

All 750 products, one page each.

How to read this list

Two things separate these and both are on every card.

Fit

Whether a tool is built for this job, a strong fit for it, or able to do it without that being its focus.

Free plan

Whether there is a tier you can keep using rather than a trial that expires.

The order

Fit first, then a free plan, then alphabetical. There is no score, no weighting we decline to publish, and nothing on this site a company can buy.

Questions

What is the best ai for keyword research?

There is no single answer, which is why this page lists 3 rather than one: Surfer SEO, Perplexity, ChatGPT. 3 of them are built for this kind of work rather than able to do it. Start with a free one.

Which of these have a free plan?

2 of the 3: Perplexity, ChatGPT. Free means a real free tier you can keep using, not a trial that expires.

How was this list chosen?

By hand, from the 750 products this site tracks, and it is checked against the catalogue on every build — a product renamed or removed breaks the build rather than quietly disappearing from here. Nothing on this site can be paid for: no listing, no position, no wording.