A/B Testing Tools: A Comparative Review

Looking to elevate your marketing through A/B testing? Whether you need a free tool to get started or a comprehensive platform with advanced features, this comparison breaks down the best A/B testing tools — including Fibr, VWO, Google Optimize, and Optimizely — to help you make an informed decision based on your unique optimization goals.

Pricing & Access

AI & Personalization Features

Visual Editing & Variation Management

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Support & Training

About this company

Fibr AI was founded in 2022 to solve the disconnect between hyper-targeted marketing channels (ads, email, search) and static website experiences. The platform combines software infrastructure, AI agents, and human-in-the-loop oversight to create personalized, dynamic web experiences at scale. It enables marketers to build AI-driven landing pages, run continuous experimentation, and personalize experiences based on ads, location, device, behavior, CDP/CRM data, and LLM-sourced traffic. The company is headquartered in Delaware, USA.

Founded 2022. Headquartered in Delaware, USA.

Target customers:

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Backed by leaders from

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Frequently asked questions

What is Fibr AI?
Fibr AI is an Agentic Web Experience Platform that transforms website URLs into intelligent, adaptive agents. Each page senses visitor intent, makes decisions, and reshapes itself in real time to deliver personalized web experiences.
When was Fibr AI founded?
Fibr AI was founded in 2022.
Where is Fibr AI headquartered?
Fibr AI is headquartered in Delaware, USA.
Who is Fibr AI built for?
Fibr AI is built for enterprises looking to personalize at scale, growing businesses starting their web optimization journey, and agencies or marketing affiliates looking to optimize websites for their clients.
What problem does Fibr AI solve?
Fibr AI addresses the disconnect where ads, email, and search are hyper-targeted and AI-powered, but website visitors land on the same static page regardless of where they came from. Fibr makes the website itself as intelligent and context-aware as the marketing channels driving traffic to it.
How does Fibr AI personalize web experiences?
Fibr AI uses AI agents combined with human oversight to detect visitor signals, decode intent, and rewrite page experiences in real time. Personalization can be based on ads, location, device, browser, behavioral signals, visit frequency, LLM-sourced traffic, CDP data, CRM data, and custom audiences.
What results does Fibr AI claim to deliver?
Fibr AI claims results including +28% higher ROI from AI-driven personalization, +30% lower customer acquisition cost (CAC) from intent-based targeting, and 4X more leads from personalizing experiences at scale.
What are the pricing plans offered by Fibr AI?
Fibr AI offers three plans: a Starter Plan for growing businesses (up to 1,000 experiences), an Enterprise Plan for large organizations requiring unlimited visitor sessions and unlimited domains/URLs, and an Agency Plan for agencies and marketing affiliates covering 10,000 monthly visitor sessions and 5 unique URLs.
What features are included in the Enterprise plan?
The Enterprise plan includes Web-Journey Personalization, LLM-Traffic Personalization, AI Landing Page Creator, Customized Agentic Workflows, White-Glove Assistance, CDP/CRM and Analytics integration, On-Brand Agent Training, and 24/7 Dedicated Support with unlimited visitor sessions and unlimited domains and URLs.
What security and compliance certifications does Fibr AI have?
Fibr AI states alignment with SOC 2, ISO 27001, GDPR, and CCPA standards.
What integrations does Fibr AI support?
Fibr AI integrates with CDP (Customer Data Platform), CRM systems, and analytics platforms.
Does Fibr AI support A/B testing and experimentation?
Yes. Fibr AI includes an Experimentation Suite that provides AI-powered hypothesis creation, automated variant creation, audience-based experimentation, statistical significance monitoring, traffic allocation setup, and continuous learning and iteration.
How does Fibr AI handle AI ethics and human oversight?
Fibr AI states that its agents adapt experiences without manipulating them, and that it prioritizes transparency, security, and human oversight at every layer. The platform operates with a 'humans-in-the-loop' model where human allies guide strategy, brand alignment, and key decisions.
How do I get started with Fibr AI?
Fibr AI directs prospective customers to book a demo to get started.
Is there a free A/B testing tool available?
Yes. Fibr offers lifetime free A/B testing, allowing you to create, run, and analyze A/B tests on any webpage forever — with no credit card required and easy setup.
How many concurrent tests can each tool run?
Fibr and VWO both support unlimited concurrent tests. Optimizely also supports unlimited concurrent tests. Google Optimize is limited to up to 5 simultaneous tests.
Which tools offer unlimited test variations?
Fibr and VWO both offer unlimited variations. Optimizely also supports unlimited variations. Google Optimize does not specify a variation limit (listed as N/A in this comparison).
Does Fibr support AI-powered features for A/B testing?
Yes. Fibr includes AI-powered A/B testing with intelligent insights, as well as AI-driven text suggestions that provide alternative text recommendations for website content. These features are not available on Google Optimize or Optimizely in this comparison.
What targeting options are available for A/B testing?
The tools compared support a wide range of targeting options, including source-based, device-specific, visitor-type, OS-based, browser-specific, behavior-based, UTM parameter, IP-based, geographic, JavaScript-based, intent-based, query parameter, conditional segmentation, and behavioral targeting. User type-specific targeting based on browsing history is not available on Google Optimize.
Which security and compliance certifications are supported?
Fibr supports compliance with SOC 2, GDPR, ISO 27001, and CCPA standards, and offers Two-Factor Authentication (2FA) and Single Sign-On (SSO) via any SAML 2.0 identity provider.
Can Google Optimize track multiple goals in a single report?
Google Optimize supports multi-goal comparison and traffic source-based filters in reports, but these capabilities are available via Google Analytics (GA) rather than natively within the platform itself.
Does Google Optimize support multi-user account access?
No. Multi-user account access is listed as not available (N/A) for Google Optimize in this comparison.
Is personalized onboarding included for free with any of these tools?
Personalized onboarding and training is included with Fibr. For VWO, it is available as a paid add-on.
Which third-party tools can be integrated with Fibr?
Fibr supports third-party integrations with tools including GA4, Google Ads, and Meta Ads.

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