keyword

21 28

Monthly search volume and cost-per-click data for "21 28" in US.

$ curl "https://api.seodata.dev/v1/keyword?q=21+28&country=us" +--------------+------------------+ | volume | 2,900 | | cpc | $0 | | competition | 0 | | country | US | | updated | 2026-06-18 | +--------------+------------------+

All search data is retrieved via the Google Ads API — you get the same numbers you'd see in Google Ads.

# related keywords

Keywords with overlapping search results, ranked by SERP similarity.

keyword	volume	cpc	overlap
21 : 28	3,600	$0	20/20
21/28	3,600	$0	18/20
21:28	2,900	$0	20/20
luke 21:28	1,600	$0	12/20
luke 21 28	1,600	$0	10/20
matthew 21:28-32	1,300	$0.05	7/20
matthew 21 28 32	880	$0.03	8/20
matthew 21 28	480	$0.01	5/20
matthew 21:28	480	$0	5/20
matthew 21:28-31	170	$0	5/20

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://api.seodata.dev/v1/keyword?q=21+28&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