KeywordClustering.net vs SERP Gap Analyzer (2026): which should you pick?
As of Oct 23, 2026, KeywordClustering.net grades higher than SERP Gap Analyzer: 2.6 against 2.0 out of 4.0.
Checked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
KeywordClustering.net grades higher on value for money and the free plan. SERP Gap Analyzer grades higher on features and platforms. They get the same grade on ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
KeywordClustering.net
Free AI keyword clustering for Keywords Everywhere users
SERP Gap Analyzer
Finds keywords whose top Google results have weak spots to beat
Which one is for you
Pick KeywordClustering.net if
- Fits if you already use Keywords Everywhere and want your export grouped into pages
- Works for planning a site's pages from a list of up to 10,000 keywords at no cost
Look elsewhere if
- Not for you if you don't use Keywords Everywhere, since you can't sign in without its API key
- Skip it if you like to tweak clusters by hand, as they can't be edited once made
- Skip it if your keyword lists mustn't leave the building, since they're sent to OpenAI's API
- Watch out: jobs are deleted after one year, and share links expire after 30 days at most
- Tight if you're on Keywords Everywhere's free plan, which caps you at 5,000 keywords 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
How we grade them
| 2.6GPAKeywordClustering.netGood | 2.0GPASERP Gap AnalyzerFair | |
|---|---|---|
| Value for money | AFree, with no paid tiers at all. Every feature, up to 10,000 keywords a job, with volumes and CPC brought in from Keywords Everywhere. | DBasic is $99 a month, well into this category's dearest tenth, for 10 reports a month with 6 suggested keywords each. Premium is $149 for 30 reports. That's a lot per keyword, even with the AI writing tools thrown in. |
| Free plan and trial | ANothing to pay. Your daily limit follows your Keywords Everywhere plan, from 5,000 keywords a day on its free plan to 200,000 on Platinum. | CNo free plan, but a 7-day free trial through the Semrush App Center. You'll need a Semrush account to start it. |
| Features | DIt clusters by intent, names each cluster, suggests a page for it and draws a bubble map, but that's one job, and it needs Keywords Everywhere to work at all. Clusters can't be edited once made, either. | CWeak-spot keyword reports, checks on ranking pages' titles, age, speed and length, Search Console fixes for slipping pages, an AI Search Score and GPT-4 drafts. It does its job, but 6 keywords per report on Basic is thin. |
| Ease of use | CNo rating on record. Pasting a list is easy, but first you need a Keywords Everywhere account and its API key to log in. | CNo rating on record. You need a Semrush account, then a domain, seed topic, language and country for each report, and up to 15 minutes' wait for it. |
| Platforms and integrations | CWeb only, with no API of its own. It imports Keywords Everywhere Favorites and exports to CSV, Excel or a share link. | BWeb only, inside Semrush, and it connects to Google Search Console to find your pages that are slipping. No desktop or phone app, and no API on record. |
| Best for | free clustering for Keywords Everywhere users | finding keywords where the top results are weak |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: KeywordClustering.net and SERP Gap Analyzer. How we grade
Price against what you get
KeywordClustering.net has no paid plan and scores 1.7 out of 4 on features, ease of use and platforms. SERP Gap Analyzer starts at $99 a month and scores 2.3.
SERP Gap Analyzer scores higher, and starts $99 a month higher: the question is whether the extra is worth that to you. Of the other keyword research tools on the chart, none scores higher than KeywordClustering.net for less, and 15 score higher than SERP Gap Analyzer for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- SERP Gap Analyzer also covers long-form writing, AI search visibility and content optimization.
At a glance
| KeywordClustering.net | SERP Gap Analyzer | |
|---|---|---|
| Pricing | Free | Free trial |
| Starts at | Free | $99 per month |
| Free plan | Free for any Keywords Everywhere user: up to 10,000 keywords per job, with a daily limit from 5,000 (Keywords Everywhere Free) to 200,000 keywords (Platinum). | None |
| Free trial | None listed | 7-day free trial through the Semrush App Center |
| Web | ||
| Made by | Keyword Clustering | TopicRanker Inc. |
| Price read from | keywordclustering.net | semrush.com |
| Checked | Oct 23, 2026 | Oct 23, 2026 |
Worth knowing
KeywordClustering.net
- You cannot sign in without a Keywords Everywhere API key, and your Keywords Everywhere plan sets the daily keyword limit.
- Clusters cannot be edited once created; the FAQ says to run a new job instead.
- Clustering jobs are deleted automatically after one year.
- Keywords are sent to OpenAI's API for clustering, as its terms state.
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.
Key features
KeywordClustering.net
- Intent-based clustering
- AI reads all the keywords in a job and groups those that would target the same page, choosing the number and size of clusters itself.
- Volume and CPC attached
- Every keyword gets monthly search volume and CPC from the Keywords Everywhere API, with total volume and average CPC per cluster.
- Page suggestions
- For each cluster, AI suggests what type of page to create and writes a title and meta description, shown as a Google-style preview.
- Paste, upload or import
- Paste a list, upload CSV, TXT or Excel with column mapping, or import from Keywords Everywhere Favorites; duplicates are removed.
- Export and expiring share links
- Export to CSV or Excel, or share a read-only link that expires after 24 hours, 7 days or 30 days.
- Cluster map
- An interactive bubble chart of all clusters, sized by search volume, that jumps to a cluster's details when clicked.
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.
Plans
KeywordClustering.net
Free$0
Every feature, up to 10,000 keywords per job. Daily limit by Keywords Everywhere plan: 5K Free, 10K Bronze, 20K Silver, 100K Gold, 200K Platinum.
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.
Common questions
Which is cheaper, KeywordClustering.net or SERP Gap Analyzer?
As of Oct 23, 2026, KeywordClustering.net is cheaper to start with: it is free, against $99 a month for SERP Gap Analyzer. KeywordClustering.net is free, and SERP Gap Analyzer starts at $99 per month.
Which has a free plan, KeywordClustering.net or SERP Gap Analyzer?
As of Oct 23, 2026, only KeywordClustering.net has a free plan. SERP Gap Analyzer does not, though it has a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.