9 Compilations Why You Should Stop Using Tag-Based Solutions For Your A/B Testing

By Jen Decker

July 11, 2022


There are a number of optimization platforms on the market, each touting its own set of differentiators and benefits. However, they all have one critical similarity – they are tag-based.

Tag-based optimization solutions depend entirely on tracking cookies to collect data. No matter how brilliant you are at A/B testing, data analysis, or optimization, if you use a tag-based tool you’ll never get accurate data and never be able to optimize your customer experience on the client side.

SiteSpect’s patented architecture doesn’t set cookies in the browser at all, meaning it offers full data accuracy, personalization, and A/B testing capabilities without interfering with user privacy.

SiteSpect vs. Tag-Based Tools

We’ve written and presented on this topic multiple times. We thought it would be helpful to our readers to combine some of our resources in one place. Take a look at these 9 examples where we talk extensively about the impacts of tag-based solutions, internet tracking prevention (ITP)/enhanced tracking prevention (ETP), cookies and CNAME cloaking.

  1. How SiteSpect Works
  2. How JavaScript Tags Affect Site Performance
  3. SiteSpect is the Only Optimization Platform Not Affected by Safari ITP
  4. Speed Feeds Business: How Javascript Tags Affect Performance – Ebook
  5. SiteSpect Not Affected by Firefox Enhanced Tracking Prevention
  6. Marketers Beware of Lost Cookies: The Data Impact of Safari and Firefox Tracking Prevention
  7. A/B Testing and Web Optimization is About to Change: What You Need to Know
  8. Using CNAMEs to bypass ITP has been put to Torch
  9. Why is Tagless Better for Optimization Tools?

Too Much to Read?

Let’s break this down so it is byte size (see what I did there?):

Tag-Based Solutions

The data accuracy for tag-based solutions is 77%*

Tag-Based Solutions use Client-Side Cookies:

  • Safari expires all client-side cookies after 7 days
  • Firefox expires all client-side cookies every 24 hours
  • Chrome – coming in 2023!
  • CNAME Cloaking Workaround – Blocked by Safari

All of this means:

  • Inaccurate user-level data
  • Faulty new vs returning visitor data
  • Flawed source attribution
  • Inconsistent user experience
  • Incomplete campaign experiments
  • Limited personalization


The data accuracy for SiteSpect is 96%.*

SiteSpect uses Server-Side Cookies:

  • No browser expiration
  • No CNAME Cloaking

All of this means:

  • Accurate user-level data
  • Accurate new vs returning visitor data
  • Accurate source attribution
  • Seamless user experience across channels (Omnichannel)
  • Complete campaign experiments that reach statistical significance
  • Consistent and unlimited personalization
*Stats are the result of POCs with existing SiteSpect customers and prospects and are based upon our analytics validation test, which is included in each POC.

The clear winner here is SiteSpect. If you are using a tag-based optimization solution, you’re negatively impacting your company’s revenue because the data is inaccurate and you can’t make informed decisions that convert. Share this with your team today and make a move to SiteSpect.

Need more? Request a personalized demo!


Jen Decker

Jen Decker

Jen Decker found her fit in the world of inbound marketing as the digital marketing manager at SiteSpect. With an extensive background in digital marketing, Jen has a knack for writing, strategy and organization.

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