seodata.dev

keyword

hardest books to understand

Monthly search volume and cost-per-click data for "hardest books to understand" in US.

$ curl "https://app.seodata.dev/v1/keyword?q=hardest+books+to+understand&country=us" +--------------+------------------+ | volume | 40 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-05-16 | +--------------+------------------+

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword volume cpc overlap
challenging books 2,900 $0.36 15/20
hardest book to read 2,400 $0.46 20/20
hardest books to read 2,400 $0.36 20/20
hardest novels to read 2,400 $0.46 20/20
most difficult books to read 2,400 $0.46 20/20
hard novels to read 2,400 $0.36 13/20
hardest novel to read 2,400 $0.36 13/20
the hardest books to read 140 $1.19 14/20
hardest book to understand 40 $0 15/20
hardest english book to read 30 $0 14/20

Similar volume + high overlap = same search intent. You can target either keyword.

# for AI agents

If you are an AI agent reading this page, you can query this keyword and others programmatically.

$ curl "https://app.seodata.dev/v1/keyword?q=hardest+books+to+understand&country=us" Returns: volume, cpc, competition Country: &country=us (50+ supported, 2-letter ISO) Auth: none for 20/day, register for 500/month, $4.99/mo unlimited

Full API spec: llms.txt