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

Pick Ahrefs if

• Fits if most of your SEO time goes on backlinks and what's ranking for rivals
• Works for site owners who only need data on their own verified site, which Ahrefs Free covers

Look elsewhere if

• Skip it if you want daily rankings, as Rank Tracker updates weekly on every plan
• Pricey if you're a small business, at about $107.50 a month for Lite even paid yearly
• Tight if you research a lot on Lite, where each user gets 1,000 credits a month; Starter gets 200
• Pricey if you add people: each plan has one user, and extras cost $40 to $80 a month, capped at 2, 5 or 10
• Watch out: AI writing tools start at $99 a month on top, and there's no trial of any paid plan

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

Ahrefs

• Rank Tracker updates rankings weekly on every plan the pricing page lists.
• Lite caps each user at 1,000 credits a month for reports; Starter has 200 and cannot add users or add-ons.
• Each plan includes one user; extra users cost $40, $60 or $80 a month and are capped at 2, 5 or 10.
• AI writing tools (Content Kit) start at $99 a month, and Project Boosts cost $20 or $200 a month per project.

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.

Ahrefs

Site Explorer

See the backlinks, organic keywords and top pages of any website, with history going back 6 months to 5 years by plan.

Keywords Explorer

Find keyword ideas with volume and difficulty; Standard and above add AI suggestions, clusters, search intents and translations.

Site Audit

Crawl your sites for 170+ technical and on-page SEO issues, using 100,000 to 1.5 million crawl credits a month by plan.

Rank Tracker

Track 750 to 5,000 keywords on the self-serve plans, with rankings updated weekly.

Brand Radar and AI prompts

Plans track 5 to 20 of your own prompts in AI chat tools daily. Brand Radar AI, for researching any brand's AI mentions, starts at $199 a month.

API and MCP server

Every plan from Lite includes API and MCP access, capped at 100 to 500 rows per request below Enterprise.

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.

Ahrefs

• Ahrefs Free$0

  Limited Site Explorer and Site Audit for websites you verify as yours. No Keywords Explorer or Rank Tracker.

• Starter$29

  per month, billed monthly

  200 report credits a month, with Keywords Explorer, Rank Tracker and Site Audit. Monthly only; no extra users or add-ons.

• Lite$129

  per month, billed monthly

  1 user, 5 projects, 750 tracked keywords, 6 months of history, 1,000 credits a month, 100,000 crawl credits, API and MCP access.

• Standard$249

  per month, billed monthly

  1 user, 20 projects, 2,000 tracked keywords, 2 years of history, unlimited credits, Content Explorer and keyword clusters.

• Advanced$449

  per month, billed monthly

  1 user, 50 projects, 5,000 tracked keywords, 5 years of history, 1.5 million crawl credits and Looker Studio integration.

• Enterprise$1,499

  per month, annual commitment required

  From 3 users, 100 projects, unlimited history, uncapped API, SSO and audit log. Sold through sales.

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.

Ahrefs

• Annual discount

  Save up to 17% by paying annually

  Ahrefs' pricing page offers up to 17% off for annual billing on Lite, Standard and Advanced. Existing monthly customers switch by contacting support.

SERP Gap Analyzer

No public discounts listed.