A/B testing market share on brand websites

Experiments and feature flags.

#	Technology	UK brands	United Kingdom	Global
1	Optimizely	2.8%	0.5%	0.6%
2	VWO	2.6%	1.5%	1.6%
3	AB Tasty	1.6%	0.6%	0.3%
4	Convert	1.4%	0.8%	0.3%
5	Adobe Target	0.7%	<0.1%	0.3%
6	Kameleoon	0.4%	0.1%	0.3%
7	Google Optimize (retired)	0.4%	0.3%	0.3%
8	LaunchDarkly	0.2%	<0.1%	<0.1%
9	GrowthBook	<0.1%	<0.1%	<0.1%
10	Statsig	0%	0%	<0.1%

By site popularity

Share of measured sites in each Tranco popularity band that use the technology: the top 1,000, 10,000 and 100,000 sites and the whole top million.

#	Technology	Top 1K	Top 10K	Top 100K	Top 1M
1	Optimizely	0%	3.7%	4.6%	3.8%
2	VWO	2.6%	2.9%	2.8%	3.6%
3	AB Tasty	0%	1.5%	2%	2%
4	Adobe Target	2.6%	1.5%	1.6%	1.3%
5	Kameleoon	0%	0.7%	0.6%	0.6%
6	Google Optimize (retired)	0%	0.7%	0.4%	0.6%
7	LaunchDarkly	0%	0.7%	0.2%	0.4%
8	Convert	0%	0%	0.8%	1.6%
	Sites measured	38	136	503	689

Our crawler: 1,359 sites · UK brands · updated 23 Oct 2026 · Methodology