Search 'best SEO software' and most lists rank the same handful of tools without saying what each one is actually for. A more useful way to shop is by job: crawling your own site for technical errors is a different task from tracking rankings and AI visibility across hundreds of keywords, and both are different from turning keyword research into content that gets written, published and measured.
The best SEO software depends on the job: Screaming Frog crawls a site for broken links, redirects and metadata errors; Semrush and Ahrefs track keyword rankings, backlinks and AI visibility at scale; SEOAgent plans, writes, publishes and tracks content from one tool. Pick based on which job is currently unhandled, not which name appears most often.
Best SEO software compared at a glance
| Software | What it is | Best for | Price |
|---|---|---|---|
| Screaming Frog SEO Spider | Desktop crawler that audits a site the way a search engine would | Finding broken links, redirects and metadata errors on your own site | Free up to 500 URLs; from $279/year per licence |
| Semrush | Platform for keyword tracking, site audits and AI visibility monitoring | Teams that want rankings, technical audits and AI search tracking under one login | Free; from $117.33/mo billed annually |
| Ahrefs | SEO platform built on its own web crawl index | Backlink and keyword research, with AI prompt tracking included | Free (Ahrefs Free); from $129/mo |
| SEOAgent | Reads a site, plans and writes posts, publishes them and tracks what happens next | Small teams who want the content pipeline handled without stitching tools together | see seoagent.bot |
Screaming Frog SEO Spider
Screaming Frog SEO Spider is a desktop crawler: point it at a site and it visits every URL the way a search engine would, then reports what it finds. Its feature list covers broken link, error and redirect detection, page title and meta data analysis, meta robots and directive review, hreflang auditing, duplicate page detection, XML sitemap generation, JavaScript rendering, structured data validation, and integrations with Google Analytics, Search Console and PageSpeed Insights, plus the ability to crawl with OpenAI and Gemini. The free version runs the same feature list but caps a crawl at 500 URLs. A paid licence removes that cap and costs $279 a year for one to four licences, dropping to $265 at five to nine, $249 at ten to nineteen, and $235 at twenty or more; each licence lasts one year before renewal.
This suits developers and in-house SEOs who want to run their own technical crawls locally instead of relying on a hosted dashboard.
Semrush
Semrush's SEO plan costs $117.33 a month billed annually, or $139 billed month-to-month, and covers five websites, 500 keywords tracked daily, basic keyword research and competitor analysis, Position Tracking and Site Audit. It already includes AI tracking: performance in AI search, AI sentiment monitoring, AI visibility reports for any domain, and custom prompt monitoring. The Starter plan, called "SEO + AI Search", costs $165.17 a month billed annually ($199 month-to-month) and adds MCP access plus quantified AI limits: 50 prompts tracked daily, one domain for AI brand performance, and 300 AI visibility reports a day. Pro+ costs $248.17 a month billed annually ($299 month-to-month), raises the website limit to 15 and the keyword limit to 1,500, adds historical SEO data, content optimization, keyword cannibalization analysis and multi-location tracking, and tracks 100 prompts a day. Advanced is custom-priced for 40 or more monitored websites, 5,000 or more tracked keywords, share-of-voice reporting, and unlimited daily prompt tracking. A free plan gives one demo project and 10 reports a day across Semrush's tools.
This suits teams that want rankings, technical audits and AI visibility tracking under one subscription instead of several logins.
Ahrefs
Ahrefs runs on its own web crawl index. The Lite plan costs $129 a month for five projects, six months of historical data, 750 tracked keywords, five tracked AI prompts through its Brand Radar feature, and 100,000 monthly crawl credits, with API and MCP access included. Standard, at $249 a month, raises that to 20 projects, two years of historical data, 2,000 keywords and 10 AI prompts. Advanced, at $449 a month, goes to 50 projects, five years of data, 5,000 keywords and 20 AI prompts. Enterprise costs $1,499 a month on an annual commitment and adds uncapped API access, SSO and unlimited historical data. Rank Tracker updates weekly on every plan. Ahrefs Free gives limited access to Site Explorer and Site Audit without a paid plan.
This suits people whose main job is keyword and backlink research, with AI prompt tracking folded into the same account.
SEOAgent
SEOAgent is ours, so weigh that when you read this, but here is what it does, drawn only from its own documentation. It reads a site, pulls keyword candidates from four sources, scores how winnable each one is, and turns the best into planned topics with a title, an angle and the questions readers ask, grouped into clusters with pillar pages on a two-week calendar. It writes the article from that plan, scores it for SEO and for how quotable it is to AI answer engines, flags AI-sounding style, and publishes to WordPress or to any site through a signed webhook or JSON feed at a scheduled time. It also keeps rank tracking for the keywords you choose, keeps track of the prompts, topics and brand names you want AI answers to mention, checks a site against a quotable checklist covering robots.txt, title, meta description, H1, JSON-LD and sitemap, and exports white-label reports as PDF or CSV.
This suits founders and small teams who want research, writing, publishing and tracking handled in one tool instead of assembled from a crawler, a rank tracker and a separate writing process.
How to choose
Start with the job that is actually blocking you this week. If you do not know whether your site has broken links, duplicate titles or orphan pages, a crawler like Screaming Frog, or SEOAgent's site audit, which checks each page's status code, title, meta description, H1 and canonical before scanning the whole site for duplicates and orphan pages, answers that faster than a full platform subscription. If the job is tracking a growing list of keywords and AI prompts across a team, Semrush or Ahrefs carry that scale better than a single-site crawler. If the backlog is content that needs researching, writing, publishing and tracking, that is a different job again.
Whatever you pick, check it against Google's own guidance on third-party SEO tools, services and advice. Google does not evaluate these services, using one does not guarantee a ranking result, and no tool can see Google's internal ranking data no matter what its dashboard implies. Google's guidance on hiring an SEO adds that no one can guarantee a #1 ranking, so treat that promise as a warning sign whether it comes from a consultant or a piece of software. The same caution applies to advice about getting cited in AI answers, sometimes called AEO or GEO: treat it as an opinion backed by data, not a guarantee, and check it against Google's own Search documentation before acting on it.
What's new (as of 2026-10-18)
Google Search Central published guidance addressing third-party SEO tools, services and advice directly, last updated 5 June 2026. It names AEO and GEO services by those terms and tells site owners to check any claim a tool or advisor makes against official Google guidance rather than taking it at face value. The core warning has not changed: Google does not evaluate third-party tools, and no tool has access to Google's internal ranking data regardless of what its reports claim. Read the full guidance on third-party SEO tools before signing a contract based on a vendor's promises.
For a deeper breakdown of tool limits and costs before you commit, see our comparison of five SEO tools by use, cost and limits.
Key takeaways
- The best SEO software depends on the job: crawling, tracking rankings and AI visibility, or producing content, not which name tops the most lists.
- Screaming Frog SEO Spider is free for crawls up to 500 URLs; a paid licence starts at $279 a year and removes that cap.
- Semrush and Ahrefs both track AI prompts alongside traditional rankings, starting at $117.33 a month and $129 a month respectively when billed annually.
- Google does not evaluate third-party SEO tools and warns that none of them can access its internal ranking data or guarantee a result.
- SEOAgent combines keyword research, writing, publishing, rank tracking and an AI-visibility checklist in one tool.
FAQ
Is there free SEO software that actually works?
Yes. Screaming Frog SEO Spider's free version runs its full feature list on crawls up to 500 URLs, Semrush's free plan includes one demo project and 10 reports a day across its tools, and Ahrefs Free gives limited access to Site Explorer and Site Audit without a paid subscription. None of these free tiers track rankings or AI prompts at the scale a paid plan does, but they are enough to check a small site's technical health before paying for anything.
Can SEO software guarantee a #1 ranking?
No. Google's own guidance warns that no one can guarantee a #1 ranking, and that using a third-party SEO service or tool does not guarantee ranking success. Third-party tools do not have access to Google's internal ranking data, so any ranking prediction a dashboard shows is that vendor's own estimate, not information from Google.
How often should I check Search Console instead of relying on third-party software?
There is no need to sign in every day. Google's own guidance on Search Console says to check your account roughly once a month, or whenever you change your site's content, and Google will email you if it finds new issues in the meantime. Third-party software can track more keywords and more history, but Search Console remains the source Google itself provides.
Do I need to hire an SEO, or is software enough?
It depends on the site. Google's guidance says a small local business can often do much of the work itself, starting with Google's own SEO starter guide, while a site redesign or a new launch is a good time to bring in a professional. If you do hire someone, grant them only read access to Search Console at first, and check their recommendations and any tools they use against official Google guidance rather than taking their word for it.