Free SEO Tools for SaaS and Marketers
7 browser-based tools built by an SEO practitioner with 15+ years of hands-on experience. SEO diagnostics, keyword analysis, text converters and data utilities, for the small jobs that come up mid-task and do not justify a paid seat. No signup. No limits. Everything runs in your browser.
Domain Rating Checker
NewCheck any website's Ahrefs Domain Rating (DR) score instantly for free. Powered by the official Ahrefs public API. No signup, no limits.
Google Penalty Checker
PopularIdentify which Google algorithm update caused your traffic drop. Select a year and month to see all confirmed core, spam, and helpful content updates from 2003 to 2026.
Keyword Density Checker
Analyze keyword frequency and density percentage in your content. Spot over-optimization, check target keyword coverage, export results as CSV.
Free SEO Word Counter
PopularCount words, characters, sentences, paragraphs, reading time, and speaking time in real time. Includes a word limit tracker.
SEO Text Case Converter
Convert text between lowercase, UPPERCASE, Sentence case, Title Case, alternating, and inverse case. Copy or download the result instantly.
Keyword List to Spintax Generator
Paste a keyword or synonym list separated by commas or line breaks and convert it into {word1|word2|word3} spintax format. Also builds spintax word by word and expands existing spintax.
Column to Comma Converter
Convert SEO keywords from a column (one per line) into a comma-separated list. Supports custom separators, quote wrapping, deduplication, and sorting.
Have a tool idea?
All these tools were built based on real SEO workflows. If you need a specific tool, let me know.