Side by side
SemanticOS vs SEO Clusterizer
Both stand on content optimization software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Web
SemanticOS covers topical planning, semantic briefs, analysis, exports, and CMS publishing, with plan sizes from one project to unlimited projects. Buyers should account for the required Claude key and Anthropic usage charges when evaluating total cost.
Visit SemanticOS Free plan APIWeb
SEO Clusterizer combines keyword clustering with SERP grouping and content analysis, with a free tier and paid plans at $29 a month for Pro and $89 a month for Agency. Check the per-plan quotas and history periods against your workload before choosing a plan.
Visit SEO ClusterizerThe facts
| SemanticOS | SEO Clusterizer | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Web | API, Web |
| Lowest paid plan | Starter: $59 a month | Pro: $29 a month |
| Plans published | 5 | 4 |
| Maker | Not published | Not published |
| Website | semanticos.ayonchy.com | seoclusterizer.com |
| On content optimization software | #24 of 68 | #20 of 68 |
SemanticOS: what it does well
- Entity-based maps include internal links
- Generates H2/H3 semantic briefs
- Lists 87 SEO tools
- Supports major exports on Pro and higher
- Imports data from Ahrefs, Semrush, and Search Console
What to know first
- Every plan requires the customer’s Claude API key
- Anthropic AI charges are separate
- Starter limits users to one project
- The $7 trial ends after seven days
SEO Clusterizer: what it does well
- Eight clustering algorithms
- Accepts exports from major keyword tools
- Exports CSV, JSON, TSV, Markdown, and XLSX
- Basic clustering runs locally in the browser
- Free plan allows 500 keywords per run
What to know first
- Free plan allows five clusterings per day
- SERP results are cached for 14 days
- Agency and Pro history limits differ
Alternatives to SemanticOS Alternatives to SEO Clusterizer The whole list