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It's a split decision.
Choose Keyword Tool for quick, no-signup autocomplete ideas and a lower-cost entry to paid search-volume data: Starter is $68/month when billed annually, but its free tier hides volume, CPC and competition. Choose Semrush if you need a broader SEO and AI-visibility suite, with tracking, audits, backlinks and content tools; its SEO plan starts at $117.33/month billed annually. Semrush costs more, but includes a wider set of tools. Compare limits before switching.
01Side by side
| Keyword Tool | Semrush | |
|---|---|---|
| Starting price | Starter: $68/month annual billing; $88 month-to-month. | SEO: $117.33/month annual billing; $139 month-to-month. |
| Free plan | Free, no signup; 750+ ideas, but metrics hidden. | Free: one demo project, 10 reports/day, AI Visibility. |
| Best for | Autocomplete-based long-tail idea generation. | Teams needing SEO, content, backlink and AI-visibility tools. |
| Core strength | Suggestions across Google, YouTube, Bing, Amazon and more. | Broad SEO suite; 29B keywords and AI-visibility tracking. |
| Learning curve | Not published; focused autocomplete workflow. | Not published; broader platform spanning multiple SEO functions. |
| Integrations and data | Paid plans: web, MCP and API access across 17 platforms. | Starter includes MCP; keyword database lists 29B terms. |
| Team and seat costs | Seat limits and add-ons not published. | Additional users start at $45/month. |
| Support | Support terms not published. | Enterprise includes a dedicated manager and 24/7 SLA. |
Keyword Tool Choose Keyword Tool if
- Choose Keyword Tool if you want autocomplete ideas without an account.
- Choose Keyword Tool if a lower starting price matters most.
- Choose Keyword Tool if you need suggestions across multiple platforms.
Semrush Choose Semrush if
- Choose Semrush if you need SEO, content and backlink tools together.
- Choose Semrush if AI-visibility tracking is part of your workflow.
- Choose Semrush if you need rank tracking and technical site audits.
02Pricing compared
Keyword Tool has the lower paid entry price: Starter is $68/month when billed annually, charged as a yearly lump sum, or $88 month to month. It includes 50 requests a day and search-volume data for 50,000 keywords a day. The free version needs no account, but hides volume, CPC, competition and trend data. There is no published free trial; Keyword Tool offers a 30-day money-back guarantee.
Semrush’s SEO plan is $117.33/month billed annually or $139 month to month. It includes five websites to monitor and 500 daily tracked keywords. Its free plan allows one demo project and 10 reports a day across vital tools. Semrush also offers a free trial, but the number of days is not published. The choice is lower-cost keyword data or a broader set of included SEO tools.
03Features and depth
Keyword Tool is focused on generating long-tail ideas from autocomplete, rather than replacing a full SEO suite. It pulls suggestions from Google, YouTube, Bing, Amazon, Instagram and other platforms. The free search returns up to 750+ suggestions, and the service supports 190+ Google country domains and 120+ language interfaces. Paid plans add volume, CPC and competition data; Starter also lists access across 17 platforms through its web interface, MCP and API.
Semrush covers more of the SEO workflow: keyword research, competitor and backlink analysis, rank tracking, content optimization and technical site audits. Its homepage lists a 29-billion-keyword database and a backlink database of 43 trillion links. Plans also include AI visibility features; paid tiers set daily prompt-tracking limits, starting at 50 on Starter and 100 on Pro+. Those extra capabilities come with higher prices and plan limits. If autocomplete ideas are the main need, much of Semrush may be unnecessary.
04Ease of use and learning curve
Keyword Tool has a low-friction starting point: its free version works without an account, and the core task is entering a term to get autocomplete suggestions. The trade-off is that useful metrics are hidden on the free tier, so evaluating search volume means considering a paid plan.
Semrush puts more tools in one platform, including keyword research, audits, tracking, backlinks, content and AI visibility. That breadth may reduce the need to switch between services, but it also means more plan details and features to sort through. Its free plan is limited to one demo project and 10 reports a day. We’d compare the specific workflows and caps you need rather than assuming the larger suite is easier to manage.
Questions people ask
Which is cheaper, Keyword Tool or Semrush?
Keyword Tool’s Starter plan is $68/month when billed annually, compared with Semrush SEO at $117.33/month billed annually. Both list higher month-to-month prices: $88 for Keyword Tool Starter and $139 for Semrush SEO. These plans include different features, so compare the limits and tools you’ll actually use.
Does Keyword Tool show search volume for free?
No. Keyword Tool’s free tier provides autocomplete suggestions, but search volume, CPC, competition and trend data are hidden. Paid plans add search-volume data. The Starter plan lists 50 requests per day and data for 50,000 keywords per day.
Can Keyword Tool replace Semrush?
Only if your main requirement is keyword suggestions and related search-volume data. Keyword Tool focuses on autocomplete research across platforms. Semrush also lists backlink analysis, rank tracking, site audits, content tools and AI visibility tracking, so replacing it means finding alternatives for those workflows too.
Does Semrush track visibility in AI search?
Yes. Semrush lists AI visibility features, including prompt-level brand monitoring. Its free plan includes AI Visibility features; Starter lists 50 prompts tracked daily and Pro+ lists 100. Advanced lists unlimited prompt tracking, while Enterprise offers custom large-scale tracking.