A/B testing market share on brand websites

Experiments and feature flags.

#	Technology	UK brands	United Kingdom	Global
1	Optimizely	2.7%	0.5%	0.7%
2	VWO	2.3%	1.4%	1.6%
3	AB Tasty	1.6%	0.6%	0.3%
4	Convert	1.2%	0.7%	0.3%
5	Adobe Target	0.5%	<0.1%	0.3%
6	Google Optimize (retired)	0.2%	0.2%	0.3%
7	Kameleoon	0.2%	0.1%	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%	3.8%	3.4%
2	VWO	2.9%	2.2%	2.4%	2.9%
3	Adobe Target	2.9%	2.2%	1%	0.9%
4	AB Tasty	0%	1.5%	2%	2.4%
5	LaunchDarkly	0%	0.7%	0.2%	0.4%
6	Convert	0%	0%	0.6%	1.2%
7	Google Optimize (retired)	0%	0%	0.2%	0.4%
	Sites measured	35	136	496	678

Our crawler: 1,277 sites · UK brands · updated 13 Nov 2026 · Methodology