Cheapest · SEO agents · Prices checked October 21, 2026
Cheapest AI SEO tools (2026): 7 sorted by real price
7 AI SEO tools sorted by price, cheapest first, using only the prices each vendor publishes, with the plan name, the source and the date we checked it. 2 have a free plan. Sorted by price only, never by payment.
Quick answer
AI SEO tools by price
| # | Product | Lowest listed monthly plan | Free plan | All plans | Checked | Source |
|---|---|---|---|---|---|---|
| 1 |  Ahrefs | Starter: $29/mo | Ahrefs Free: $0 |
| October 21, 2026 | Source |
| 2 |  Frase | Starter: $49/mo ($39/mo billed yearly; 7-day free trial) | No |
| October 21, 2026 | Source |
| 3 |  Surfer | Discovery: $49/mo (billed yearly) | No |
| October 21, 2026 | Source |
| 4 |  Search Atlas | Starter: $99/mo (billed monthly; 7-day trial) | No |
| October 21, 2026 | Source |
| 5 |  Clearscope | Essentials: $129/mo (50 tracked queries) | No |
| October 21, 2026 | Source |
| 6 |  Semrush | Starter: $139/mo ($117.33/mo billed yearly) | Free: $0/mo |
| October 21, 2026 | Source |
| 7 | Alli AI | Business: $299/mo (5 sites) | No |
| October 21, 2026 | Source |
How we sorted: the lowest monthly price printed on each vendor's pricing page, cheapest first; products that only publish usage, yearly or quote pricing come last. Prices are copied from each vendor's public pricing page on the date shown; plan names and billing notes (per seat, billed yearly) are kept as the vendor writes them. "not published" or "Contact sales" means the vendor doesn't publish a price; we don't guess. Prices change; confirm with the vendor.
All 7, cheapest first
SEO agents →-
SEOFree tier
Ahrefs
An SEO toolset for backlinks, keyword research, site audits and rank tracking, now with AI content tools, MCP access and AI-search tracking.
SubscriptionFree; Starter $29/mo
-
SEO
Frase
An SEO and content agent that researches what ranks, writes and optimises articles, and audits pages for search and AI answers.
Subscription$49/mo
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SEO
Surfer
An SEO content tool that drafts and optimises articles for target keywords and tracks your brand's visibility in AI search.
Subscription$49/mo (billed yearly)
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SEO
Search Atlas (OTTO SEO)
An SEO platform with OTTO, an agent that finds and deploys technical, on-page and local SEO fixes across your sites.
Subscription$99/mo
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SEO
Clearscope
A content optimisation tool that grades drafts against what ranks and tracks how your pages perform in search and AI answers.
Subscription$129/mo
-
SEOFree tier
Semrush
A large SEO and marketing suite: keyword and competitor research, site audits, rank tracking and AI-search visibility, with AI assistants built in.
SubscriptionFree; paid from $139/mo
-
SEO
Alli AI
Pushes on-page and technical SEO changes to many sites at once through a code snippet, for agencies and multi-site businesses.
Subscription$299/mo
FAQ
What is the cheapest AI SEO tool in 2026?
Of the 7 AI SEO tools we list with verified pricing, the cheapest by listed monthly price is Ahrefs, whose lowest listed monthly plan is Starter: $29/mo, checked October 21, 2026. With a free plan: Ahrefs and Semrush. Cheapest isn't always best value: compare what each plan includes.
Is there a free AI SEO tool?
Yes. Ahrefs: yes. Its Ahrefs Free plan is $0 (limited data), checked October 21, 2026. Semrush: yes. Its Free plan is $0/mo (AI visibility trial features), checked October 21, 2026.
How much does an AI SEO tool cost per month?
The lowest listed monthly plans run from $29/mo (Ahrefs) to $299/mo (Alli AI) across the 7 that print a monthly price. Prices checked October 21, 2026.
Can a vendor pay to be listed as cheaper?
No. The order is by price only, from each vendor's public pricing page on the date shown. Paid placements on AITeamGuide are always labelled "Sponsored" or "Featured" and never change this order.
Related guides
All cheapest lists →- Surfer SEO vs ClearscopeSide-by-side pricing
- Surfer SEO vs FraseSide-by-side pricing
- Search Atlas vs SemrushSide-by-side pricing
- Ahrefs vs Search AtlasSide-by-side pricing
- Surfer alternatives6 compared by price
- Semrush alternatives6 compared by price
- Ahrefs alternatives6 compared by price
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Every AI agent with a free plan · All AI agent prices in one table · AI agent pricing statistics
Work at a company on this page? Vendors can claim their listing for free or feature it with a label that says "Sponsored"; paid status never changes the order on this page. Building a different agent? List it here.
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