Semrush vs SERP Gap Analyzer (2026): which should you pick?

Pick Semrush if

• Fits if you want research, rank tracking and audits in one account and can pay $117.33 a month or more
• Works for agencies that need keyword data for many countries and compare client sites with competitors

Look elsewhere if

• Pricey if you're one person with one site, at $117.33 a month even yearly, and the trial checks your card with a small charge
• Tight if your team is more than just you, since every extra user is from $45 a month
• Skip it if AI answer tracking is the point, as the SEO plan leaves it out and Starter is $165.17 a month
• Watch out: the API and share of voice need the custom-priced Advanced plan, and scheduled PDF reports are $10 to $20 a month extra
• Watch out: local, content, social and ad tools are separate toolkits with their own prices, and the free plan allows 10 reports a day

Pick SERP Gap Analyzer if

• Fits if your site is small and you want keywords where the current top 10 has weak pages
• Works for Semrush users choosing which slipping pages to update first

Look elsewhere if

• Pricey if you want lots of keywords, as $99 a month gets 10 reports of 6; Premium is $149 for 30
• Skip it if you don't use Semrush, since it's sold through its App Center
• Not for you if you need results fast, as each report can take up to 15 minutes
• Watch out: TopicRanker's own cards show tighter limits than Semrush's, such as 1 domain and 3 reports on Basic
• Watch out: a scanned domain can't be deleted, only archived, and there's no API on record

Semrush

• Each plan includes one user; extra users start at $45 a month each, priced by plan level.
• Scheduled PDF reports are an add-on at $10 a month, or $20 with white-labeling; Advanced includes reporting.
• API access and share of voice come only with the custom-priced Advanced plan.
• Local, content, social, advertising, AI PR and traffic tools are separate toolkits with their own prices.

SERP Gap Analyzer

• Sold through the Semrush App Center, so it needs a Semrush account; the maker's own site sends trial sign-ups there.
• Basic allows 10 analysis reports a month with 6 suggested keywords each; Premium raises that to 30 reports and 12 keywords for $50 more.
• Each report can take up to 15 minutes, and a scanned domain cannot be deleted, only archived.
• TopicRanker's own pricing cards show tighter limits than the Semrush listing, such as 1 domain and 3 reports a month on Basic.

Semrush

Keyword research

Look up search volume, difficulty and intent from a database Semrush puts at 29 billion keywords across 142 country databases.

Competitor and backlink analysis

See which keywords and pages bring a rival site its traffic, and inspect any domain's backlink profile.

Position Tracking

Track daily rankings for 500 to 5,000+ keywords depending on the plan; Pro+ adds tracking by location and device.

Site Audit

Crawl your sites for technical SEO problems. From the Starter plan the audit also checks how ready a site is for AI search.

AI visibility tracking

Starter and above track daily whether set prompts in AI chat tools mention your brand, with sentiment monitoring. The SEO plan has none of this.

MCP and API access

Starter and above can query Semrush data from AI assistants through MCP; the API itself comes with the Advanced plan.

SERP Gap Analyzer

Weak-spot keyword reports

Enter a domain and seed topic, with a language and country, and get suggested keywords rated easy, medium or hard, with search volume and the weaknesses of pages ranking now.

Competitor page checks

Flags ranking pages with keyword words missing from the title, no update in 6+ months, load times over 3 seconds, under 1,000 words or poor readability.

Optimize Content with Search Console

Connect Google Search Console to find your pages in the top 20 over 90 days that are sinking, or get many impressions but few clicks, and see what to fix.

AI Search Grader

Tests generated prompts on ChatGPT, Claude, Gemini, DeepSeek, Mistral and Llama, ranks your brand against rivals and gives a 0 to 100 AI Search Score.

AI writing tools

GPT-4 tools write post title ideas, content briefs, meta descriptions and full first drafts with Article Genie, based on the analysis.

Seed topic suggestions

Crawls your site and uses language analysis to suggest seed topics it covers often; there is no limit on suggestions, but one query runs at a time.

Semrush

• Free$0

  1 project, 10 analytics reports a day and 10 tracked keywords, for trying the tools.

• SEO$117.33

  per month, billed annually ($139 billed monthly)

  1 user, 5 websites, 500 keywords tracked daily, basic keyword and competitor research, and Site Audit. No AI search tracking.

• Starter$165.17

  per month, billed annually ($199 billed monthly)

  5 websites and 500 keywords, full keyword research tools, MCP access, 50 AI prompts tracked daily and 300 AI visibility reports a day.

• Pro+$248.17

  per month, billed annually ($299 billed monthly)

  15 websites, 1,500 keywords, historical data, content optimization, cannibalization checks, multi-location tracking and 100 AI prompts.

• AdvancedCustom

  40+ websites, 5,000+ keywords, share of voice, API access, team users, reporting and unlimited AI prompts. Sold after a demo.

SERP Gap Analyzer

• Basic$99

  per month

  3 domains, 6 suggested keywords per report, 10 analysis reports a month and 20 exports to XLS or PDF.

• Premium$149

  per month (Basic plus a $50 monthly upgrade)

  Unlimited domains, 12 suggested keywords per report, 30 analysis reports a month and unlimited exports.

Semrush

• Annual discount

  Save up to 17% with annual billing

  Semrush's pricing page lists annual billing at up to 17% less: Starter is $165.17 a month billed annually instead of $199 billed monthly.

SERP Gap Analyzer

No public discounts listed.