Ahrefs vs Semrush for a keyword-gap rescue: 142-page SaaS blog

Ahrefs vs Semrush for a keyword-gap rescue: 142-page SaaS blog
I tested both on a real account (a B2B scheduling tool, ~9k monthly clicks). Ran the same gap analysis: their top 3 rivals minus us.

Ahrefs Content Gap
➕ Surfaced 318 keywords we ranked nowhere for; export had clean parent-topic grouping
➖ Inflated some volumes vs reality by ~30% on long-tail

Semrush Keyword Gap
➕ "Untapped" filter cut noise fast; intent labels were genuinely usable for prioritising
➖ Slower UI, and the missing-keyword set was 22% smaller

What I shipped: 11 comparison pages from Ahrefs' list. 90 days later: +2,400 clicks/mo, 6 of 11 in top 10.

Best for: Ahrefs found more raw opportunity; Semrush prioritised it better.
Price-vs-value: Both ~$130-140/mo entry. For one-off gap work, a 7-day Ahrefs trial did the whole job.

Pick this if you want maximum coverage: Ahrefs.
Skip if you only do gap analysis quarterly — trial-hop instead of subscribing.