Keyword Tool vs SEO API
Keyword Tool
keywordtool.ioSEO API
seo-api.comSide by side
| Figure | Keyword Tool | SEO API |
|---|---|---|
| Price from | $68/mo | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | — |
| API | Yes | Yes |
| Plans published | 6 | 3 |
| Spec score · SEO APIs | 8.4 (#4) | 6.8 (#21) |
| Audience | The maker describes the product for solo marketers, growing businesses, in-house teams, agencies, SEO professionals, content marketers and PPC managers. | The product is presented for agencies, SaaS and tool providers, in-house teams and IT organizations. |
| Metrics | Paid plans provide search volume, cost per click, competition scores, device breakdown and historical trends. | The maker describes the product as providing more than 100 metrics, including rankings, HTML validity, Core Web Vitals, backlink types, readability and social signals. |
| Support | The site directs users to contact support for custom subscriptions and refund requests within the 30-day guarantee period. | The Starter plan includes email support, while the Professional plan includes prioritized support. |
Plans
Keyword Tool
- Starter$68 a month
- Growth$148 a month
- Scale$308 a month
- Agency$628 a month
- FreeFree
- Enterprise & CustomPriced on request
SEO API
- Enterprise & White-LabelPriced on request
- ProfessionalPrice not published
- StarterPrice not published
In their own words
Keyword Tool
Keyword Tool generates long-tail keyword suggestions from autocomplete when given a seed term. It supports keyword and competitor research across 16 platforms, including Google, YouTube, Bing, Amazon, TikTok, Reddit, Pinterest and Google Trends. The free tool works without an account and can return 750+ Google autocomplete keywords. Paid plans add search volume, cost per click, competition scores, device breakdown and historical trends; they also support search-volume enrichment for up to 1,000 keywords per request, with daily capacity depending on the plan. Access includes the web interface, API and MCP, and Claude, Cursor and ChatGPT are named as compatible assistants. Google coverage includes 190+ countries, 68,000+ locations and 50+ languages. The site says Google and Bing metrics come from planner ecosystems, while volumes for other platforms are modeled estimates based on clickstream signals. Web, API and MCP share a daily request pool, and available MCP tools can vary by endpoint, plan and rollout status. Paid plans start at $68 a month. There is no free trial; the pricing FAQ lists a 30-day money-back guarantee for paid plans.