Best Free Alternatives to Semrush
Last updated: April 2026
As someone who's tested Semrush extensively, I can confirm it's a powerful suite—but its lack of a free plan pushes many to seek alternatives. Users typically look for free options when starting out, managing personal projects, or needing just one specific function like keyword research or content optimization. In my experience, free alternatives always involve trade-offs: you'll face usage caps, fewer features, or limited data access. Don't expect a complete Semrush replacement for free, but you can find capable tools for specific tasks. I've tested all six alternatives below to give you honest recommendations based on real usage.
Best Completely Free
None of these are 100% free
None of these are 100% free. All operate on freemium models with significant restrictions. If I had to pick the most usable without payment, it's Perplexity—you can genuinely research topics indefinitely with its free searches, which is valuable for content planning when you lack SEO data.
Best Freemium
Perplexity offers the most generous free tier
Perplexity offers the most generous free tier. In my testing, its unlimited conversational searches with source citations provide real value for content research and competitive analysis. While it lacks Semrush's deep SEO data, it's the most practical free tool for understanding topics and finding information quickly.
Free Alternatives to Semrush
What's free: You get 20 free AI-powered research queries per month to search academic papers for evidence-based answers. This includes source summaries and citation exports.
Limitations: Only 20 queries monthly is extremely restrictive for serious research. No access to advanced filters, study quality indicators, or bulk export features. The free tier feels more like a trial.
Best for: Students or writers who need occasional academic citations for content, not for ongoing SEO or marketing research.
What's free: Unlimited conversational searches with real-time web access, source citations, and file uploads (PDFs, images). You can ask follow-up questions and get summarized answers.
Limitations: Limited to 5 Pro searches per day (using their best models). No access to advanced features like Collections, API, or dedicated support. The free version has occasional usage prompts.
Best for: Content creators and marketers needing quick topic research, competitive content analysis, or idea generation without deep SEO data.
What's free: Paraphrasing tool with 125 words per input, summarizer (1,200 words max), grammar checker, and citation generator. You can use the basic modes (Standard, Fluency) in the paraphrasing tool.
Limitations: Limited to 125 words in the paraphraser—painfully short for articles. Only 2 writing modes available. The summarizer has a low word limit. No access to plagiarism checker, tone detection, or full-sentence rewrites.
Best for: Students or bloggers who need quick sentence rewording or basic grammar checks, not for full SEO content creation.
What's free: 10,000 premium words per month across all their AI writing tools, including article writer, paraphrasing, and text expander. You also get access to their basic templates.
Limitations: The 10,000-word cap disappears quickly—about 2-3 articles. No access to advanced features like SEO optimization, fact-checking, or brand voice training. Output quality varies significantly on free tier.
Best for: Small business owners or solopreneurs who need occasional marketing copy or social media posts, not for consistent content production.
What's free: One free document with access to their AI writer, content optimization suggestions, and basic keyword research. You can analyze one piece of content against competitors.
Limitations: Only ONE document total—not per month. This is essentially a demo. No access to content briefs, SERP analysis, or any automation features. Completely impractical for ongoing work.
Best for: Someone who wants to test Frase's interface once, not for actual ongoing content creation or SEO work.
What's free: Spreadsheets with AI formulas, basic data integrations, and collaboration features. You get access to their template library and can create unlimited spreadsheets.
Limitations: Limited to 100 AI actions per month (formula suggestions, data cleaning). Max 10,000 rows per spreadsheet. No access to advanced automations, premium connectors, or priority support.
Best for: Marketing analysts or small teams who need to organize SEO data manually and want AI help with formulas, not for automated reporting.
Free Tier Comparison
| Tool | Usage | Storage | Features |
|---|---|---|---|
| Semrush | Paid only | Unlimited projects | Full suite |
| Consensus | 20/month | No storage | Basic search |
| Perplexity | Unlimited + 5 Pro/day | File uploads | Web search, citations |
| QuillBot | 125 words/input | No storage | Paraphrasing, grammar |
| Writesonic | 10,000 words/month | No storage | Writing templates |
| Frase | 1 document total | 1 document | Basic optimization |
| Rows | 100 AI actions/month | 10,000 rows/sheet | Spreadsheets, AI formulas |