Developer: Ahrefs Pte. Ltd. | Free Plan: Partial (Ahrefs Free for verified site owners; no free trial on paid plans) | Starting Price: $29/month (Starter); main plans from $129/month (Lite) | Best For: SEO professionals, content marketers, agencies

Developer: Semrush Holdings (NYSE: SEMR) | Free Plan: Partial (Free tier for basic exploration; free trial on paid plans) | Starting Price: $165.17/month billed annually ($199/month billed monthly) | Best For: SEO specialists, content marketers, agencies

Developer: SER Acquisition Inc. | Free Plan: No (14-day free trial, no credit card required) | Starting Price: $103.20/month billed annually ($129/month billed monthly) | Best For: Small-to-mid agencies, in-house SEO teams

Developer: Surfer Sp. z o.o. (Positive Group) | Free Plan: No (lowest paid tier is Discovery at $49/month) | Starting Price: $99/month billed annually (Standard plan) | Best For: Content teams, SEO specialists, agencies

Developer: Peec AI | Free Plan: No (free trial available, no credit card required) | Starting Price: $95/month billed annually (Starter plan) | Best For: SEO and content teams, growth marketers, agencies tracking multiple brands

Developer: Google | Free Plan: Yes, entirely free with no paid tiers | Starting Price: Free | Best For: Website owners, SEOs, developers