Keyword Tool vs Serpvox
Keyword Tool
keywordtool.io
Serpvox
serpvox.coSide by side
| Figure | Keyword Tool | Serpvox |
|---|---|---|
| Price from | $68/mo | €13.17/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| API | Yes | Yes |
| Plans published | 6 | 6 |
| Spec score · Keyword Research Tools | 8.3 (#10) | 8.4 (#9) |
| Audience | The maker describes the product for solo marketers, growing businesses, in-house teams, agencies, SEO professionals, content marketers and PPC managers. | Serpvox says it is built for SEO specialists, digital marketers, content creators, web agencies and e-commerce owners. |
| Cancellation | Subscribers can cancel at any time in account settings without cancellation fees or lock-in contracts. | Pro and Agency subscriptions can be cancelled through Stripe's customer portal, with access retained until the paid period ends. |
| Data sources | The site says Google and Bing metrics come from their planner ecosystems, while other platforms' volumes are modeled estimates based on clickstream signals. | Published sources are Google Autocomplete, Google Trends, Serper or SerpApi SERP data, OpenPageRank and connected-site Search Console data. |
| Keyword research | Yes | The product provides estimated search volume, keyword difficulty and search intent for keywords. |
| Support | The site directs users to contact support for custom subscriptions and refund requests within the 30-day guarantee period. | Priority support is included in the Agency plan; the site provides an email contact address. |
Plans
Keyword Tool
- Starter$68 a month
- Growth$148 a month
- Scale$308 a month
- Agency$628 a month
- FreeFree
- Enterprise & CustomPriced on request
Serpvox
- FreeFree
- 7-Day Pass€9, paid once
- Pro€19 a month
- Agency€49 a month
- Pro annual€158 a year
- Agency annual€408 a year
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.
Serpvox
Serpvox is a web-based keyword research tool for SEO specialists. A search combines Google Trends interest, estimated keyword difficulty and intent, and the top 10 Google results. Its difficulty calculation uses the average PageRank of those results, adjusted for featured snippets and the knowledge graph. Trends cover the previous 12 months and refresh on each search; the tool also shows People Also Ask questions and Related Searches from Google’s results. Users can connect Google Search Console to view a site’s organic traffic. Serpvox says that connection is read-only and can be disconnected at any time. Its stated data sources include Google Autocomplete, Google Trends, SERP analysis, OpenPageRank, and connected-site Search Console data. Pro supports CSV, Excel, and PDF exports; Agency adds multi-site Search Console, batch export, and priority support. Free is free, billed forever, with a limit of 3 searches per day and 30 per month. Pro costs €19 a month, Agency €49 a month, and a 7-Day Pass costs €9, paid once.