All in One SEO Pack is a popular free WordPress SEO plugin. Below are 20 free SEO software alternatives—both WordPress plugins and standalone tools—that can help you optimise your site, improve rankings, and analyse performance without any cost.
Get targeted exposure with custom position pinning and highlighted placement.
Widely‑used WordPress SEO plugin offering on‑page analysis, XML sitemaps, and readability checks.
Feature‑rich free WordPress SEO plugin with schema markup, keyword rank tracking, and automated SEO audits.
Lightweight WordPress SEO plugin providing meta‑tags, XML/HTML sitemaps, and Google Analytics integration.
Fast, ad‑free WordPress SEO solution that auto‑generates meta data and supports schema.org markup.
AI‑driven WordPress plugin that guides you through keyword research, content optimization, and SERP analysis.
All‑in‑one WordPress SEO plugin offering meta‑tags, rich snippets, and a built‑in keyword density analyzer.
WordPress plugin for bulk meta‑data editing, XML sitemaps, and image SEO optimization.
Free WordPress SEO plugin that creates XML sitemaps, manages meta data, and provides automated SEO suggestions.
Free version of the Premium SEO Pack offering meta‑tags, rich snippets, and Google Analytics integration.
Adds schema.org markup to WordPress pages and posts to improve rich‑snippet visibility.
Google’s free web‑master tool for monitoring indexing status, search performance, and site health.
Microsoft’s free suite for site diagnostics, keyword research, and backlink analysis on Bing.
Neil Patel’s keyword research and site audit tool offering limited daily queries at no cost.
Free Chrome/Firefox extension that shows page authority, domain authority, and on‑page SEO metrics.
Free browser plugin delivering instant SEO diagnostics, keyword density, and SERP overlay.
Free Ahrefs suite for site audit, backlink checking, and organic keyword tracking (requires verification).
Desktop crawler that analyses up to 500 URLs for broken links, redirects, and on‑page SEO issues.
Online tool that scans a single URL for technical SEO errors, page speed, and on‑page optimization.
Free Chrome extension that displays search volume, CPC, and related keywords directly in Google results.
Generates visual keyword ideas and question‑based queries from Google’s autocomplete data.