Semrush costs $49/mo.
These cost $0.
1 free alternatives to Semrush, checked for license, recent activity and real adoption. Each one tells you the catch, so you can switch with your eyes open.
The top-rated free, open-source replacement for Semrush is OpenSEO (MIT Open Source). Across this category, 1 self-hostable tool is available (including OpenSEO). Switching a 5-person team saves up to $2,940/year compared to Semrush's $49/mo subscription.
The catch: OpenSEO still depends on metered DataForSEO data and lacks Mangools' polished proprietary keyword database, difficulty scoring, backlink index experience, and effortless hosted workflow.
Semrush vs Free Alternatives
Quick side-by-side comparison · $0/mo vs $49/mo
| Alternative | Type | License | Where It Runs | Stars | Head-to-Head |
|---|---|---|---|---|---|
| OpenSEO | open source | MIT | Self-host | ★ 26.7k | Semrush vs OpenSEO → |
The picks
1 open source · ranked by fit
- 01
OpenSEO
open sourceMITSelf-host26.7knov 2026Manage keyword research, backlink analysis, competitor monitoring, and rank tracking without expensive SaaS subscriptions. Self-hostable, MIT-licensed, uses DataForSEO.
The catch vs SemrushOpenSEO still depends on metered DataForSEO data and lacks Mangools' polished proprietary keyword database, difficulty scoring, backlink index experience, and effortless hosted workflow.
Install, platforms & data +
- platforms
- webself-hosteddocker to self-host
- install
- Clone the repository, supply environment variables, and run the documented Docker-based web/database deployment
- setup
- A non-expert needs Docker, a database, authentication and email configuration, plus a funded DataForSEO account and API credentials, the rank tracker is not actually zero-cost to operate.
- engines
- Uses DataForSEO for keyword, SERP, backlink, and related SEO datasets; it also exposes MCP/agent integrations for compatible coding assistants.
- your data
- Projects, audits, issue results, tracked keywords, and historical observations live in the operator-controlled application database; keyword and SERP requests sent through DataForSEO leave the server and are retained/billed under that provider's account terms.
- checked
- 2026-11-07
Semrush Head-to-Head Comparisons (2027)
Side-by-side trade-off breakdowns · 1 free alternatives
Frequently Asked Questions
Direct answers · Semrush open-source replacements
What is the best free alternative to Semrush?+
The top free alternative to Semrush is OpenSEO (open source, MIT). Manage keyword research, backlink analysis, competitor monitoring, and rank tracking without expensive SaaS subscriptions. Self-hostable, MIT-licensed, uses DataForSEO.
Can I self-host a free replacement for Semrush?+
Yes. Of the 1 free alternatives to Semrush, 1 can be self-hosted on your own server or local machine: OpenSEO (MIT).
How much does switching from Semrush to a free alternative save?+
Semrush starts at $49/month per seat ($588/year). Switching a 5-person team to a free alternative like OpenSEO saves $2,940 per year in software subscription fees.
Should I vibe-code or build my own Semrush clone from scratch?+
Our build verdict for Semrush is NO (use a free alternative, save the tokens). Instead of paying recurring SaaS fees for Semrush or rebuilding it from scratch, deploy one of the 1 battle-tested open-source alternatives like OpenSEO.
What is the catch when switching from Semrush to OpenSEO?+
OpenSEO still depends on metered DataForSEO data and lacks Mangools' polished proprietary keyword database, difficulty scoring, backlink index experience, and effortless hosted workflow.
