Best Free A/B Testing Tools in 2026

Understand user behavior with product analytics and experimentation

4.5/5 across G2 and Capterra · 3,059 ratings, Sep 2026

Amplitude is a digital analytics platform that helps teams understand user behavior with product analytics, session replay, feature flags, and A/B experimentation capabilities.

Product analytics for mobile and web

4.5/5 across G2 and Capterra · 1,518 ratings, Sep 2026

Mixpanel is a product analytics platform for tracking user interactions. Event-based analytics show how users engage with features. Funnels and flows visualize user journeys. Retention analysis measures long-term engagement. A/B testing and messaging drive growth. The analytics platform product teams use to make decisions.

Feature flags and product experimentation

4.7/5 on G2 · 347 ratings, Sep 2026

Statsig provides feature flags with statistical rigor. Experimentation infrastructure-flags that measure impact properly. The statistics are rigorous. The infrastructure scales. The measurement is built in. Teams wanting data-driven feature management use Statsig for statistical feature flags.

Boost your YouTube growth with advanced channel management

4.6/5 across G2 and Capterra · 158 ratings, Sep 2026

TubeBuddy is a YouTube channel-management toolkit that installs as a browser layer on YouTube Studio. It covers keyword research, title and tag optimization, thumbnail tools, bulk processing, Shorts linking, and, on the Legend plan, A/B tests of titles and thumbnails against live traffic. Plans are Pro, Legend, and Enterprise, plus a free tier. Enterprise is custom. Creator licenses are limited by channel count, subscriber count, and seats; brands and multi-channel teams get pushed to Enterprise. Confirm current dollars at tubebuddy.com/pricing. The public page often hides the exact monthly number behind a toggle, and annual billing is a much lower effective rate than month-to-month. TubeBuddy is a growth and workflow product, not a video editor.

Automate feature flag management with intelligent, data-driven control.

4.7/5 on G2 · 93 ratings, Sep 2026

Reflag is a feature flag management platform that operates on autopilot, designed to streamline the release process and reduce operational overhead for engineering teams. It integrates directly with your existing data sources, such as Amplitude, Mixpanel, Segment, and PostHog, to automatically manage feature flags based on predefined metrics and user behavior. The platform is ideal for product teams and developers who want to move beyond manual feature flag toggling and leverage data to make informed decisions about feature rollouts, rollbacks, and A/B tests. By automating these processes, Reflag helps teams release features faster, mitigate risks, and optimize user experience without constant manual intervention. Reflag's core value lies in its ability to connect feature flags directly to business metrics. It allows users to define success criteria and automatically adjust flag states to achieve those goals, ensuring that new features are not only launched efficiently but also perform as expected.

Monetize your app with in-app purchases, analytics, and A/B testing across platforms.

4.8/5 across G2 and Capterra · 48 ratings, Sep 2026

Qonversion is an in-app purchase platform designed for app developers to manage, analyze, and grow their subscription-based mobile and web applications. It provides a comprehensive suite of tools to implement in-app purchases, track performance metrics, and optimize monetization strategies. The platform offers SDKs for iOS, Android, and web, enabling cross-platform access management. It includes robust analytics for real-time dashboards, conversion rates, MRR/ARR, and customer CRM. Qonversion also features a no-code paywall builder with A/B testing capabilities for paywall, product price, and onboarding optimization, helping developers find the best subscription prices and trial periods.

A headless CMS for optimizing user experiences through personalization and A/B testing.

4.7/5 on G2 · 48 ratings, Sep 2026

Croct is a headless CMS designed for optimizing websites through personalization, experimentation, and content management. It allows businesses to create tailored user experiences, validate hypotheses, and generate more qualified leads by adapting content and experiences based on user behavior and audience segments. The platform integrates seamlessly into existing tech stacks, working with popular tools like Strapi, Shopify, and HubSpot, and offers built-in CDP and analytics capabilities to eliminate the need for additional vendors. Croct is suitable for heads of growth, CRO managers, product managers, developers, and designers looking to accelerate optimization efforts. It provides tools for real-time analytics, cross-domain event tracking, and dynamic content delivery, enabling teams to efficiently experiment and tailor pages at a much faster rate. The platform emphasizes ease of implementation, outstanding support, and high performance in personalization and A/B testing categories.

AI-powered lightweight A/B testing platform for websites with fast load times.

4.6/5 on Capterra · 51 ratings, Sep 2026

Mida is a lightweight A/B testing platform designed for websites, offering easy integration with Google Analytics 4 and supporting unlimited testing. It provides both visual and code editors, making it accessible for marketers who prefer not to rely on developers, as well as those who need advanced customization. The platform emphasizes speed and minimal impact on site performance, featuring a script that is significantly smaller and loads faster than many competitors. Mida caters to CRO marketers and businesses looking to optimize their websites through experimentation. Its AI-powered feature, MidaGX, automates the creation of A/B test variations from ideation to live deployment, allowing users to describe or even draw desired changes. The tool supports various website builders and funnel sites by allowing custom HTML code injection, and it offers advanced targeting and cross-domain testing capabilities. It also includes features for website personalization and feature flagging, all covered under a usage-based pricing model.

Short links with advanced analytics for marketing teams

4.3/5 across G2 and Trustpilot · 46 ratings, Sep 2026

Dub is the open-source link management platform for modern marketing teams. Create short links with advanced analytics, custom domains, A/B testing, and conversion tracking.

Open-source feature flags and A/B testing

4.6/5 on G2 · 26 ratings, Sep 2026

GrowthBook is a warehouse-native feature flagging and experimentation platform used by over 2,700 companies. It connects directly to your data warehouse, Snowflake, BigQuery, Redshift, or others, so experiment results are computed on your own data without exporting events to a third party. The platform includes both Bayesian and Frequentist statistical engines with support for CUPED, sequential testing, and multiple metric corrections. Feature flags evaluate locally via lightweight SDKs (the JavaScript SDK is 9KB) with zero network requests at runtime. A visual A/B test editor enables no-code experiments for marketing and product teams. GrowthBook is available as open-source self-hosted, cloud-managed, or with a managed warehouse option.

Product analytics with privacy focus

4.1/5 on G2 · 20 ratings, Sep 2026

Countly is a product analytics platform for web, mobile, desktop, and IoT with self-hosted and cloud options. Features user analytics, retention, funnels, push notifications, and A/B testing.

Dynamically rewrite landing pages in real-time to match every ad, keyword, and audience.

BeMorphy, or Morphy, is a real-time landing page optimization tool that automatically rewrites your website content to perfectly match the specific ad, keyword, and audience segment that led a visitor to your page. By analyzing UTM parameters and other signals from ad platforms like Google Ads, Meta, LinkedIn, and TikTok, Morphy ensures that every visitor sees highly personalized content, testimonials, and even localized language and currency, all from a single URL. This eliminates the need to build and maintain hundreds or thousands of individual landing pages for different campaigns. Morphy operates as a layer on top of your existing website, requiring only a single script tag for a 5-minute setup and causing zero performance impact. It continuously A/B tests content variations, learns from performance across channels, and provides actionable insights to improve conversion rates, reduce bounce rates, and increase time on page, ultimately leading to higher Google Quality Scores and lower CPCs. It's ideal for marketers and businesses running paid ad campaigns who want to maximize conversion efficiency without extensive manual page creation.

The Agentic Web Adaptation Layer for dynamic, personalized web experiences.

Web Speed is an innovative platform designed to transform how websites interact with users by introducing an "Agentic Web Adaptation Layer." This layer sits between your existing website and the user, dynamically adapting content and experiences based on user behavior, context, and preferences. It aims to make websites more intelligent, personalized, and responsive without requiring changes to the underlying site code. The product is ideal for businesses and developers looking to enhance user engagement, improve conversion rates, and deliver highly customized web experiences. By leveraging AI and agentic principles, Web Speed allows for real-time content modification, A/B testing of dynamic elements, and the creation of adaptive user journeys, ultimately leading to a more effective and user-centric web presence. It focuses on optimizing the user experience through intelligent, on-the-fly adjustments.

Query and create feature flags, experiments, audiences and results from an AI client.

The Optimizely Experimentation MCP server gives AI assistants direct access to a feature flagging and experimentation project, so defining a test can happen next to the code that implements it. An agent can list projects, environments, flags, variations, rulesets and audiences, create or update a flag and its targeting rules, define experiment variations and traffic allocation, and read results including how each variation performed against a metric. Pairing it with a coding agent is the main use case. A developer adding a flag in the codebase can have the assistant create the matching flag and rollout rule in Optimizely, reference the right SDK key and environment, and later ask whether an experiment has reached a decision instead of switching to the results dashboard to read the numbers. Reading audience and event definitions also helps an agent write instrumentation that matches what the experiment expects to receive. It is meant for product engineers, growth and experimentation teams, and product managers running tests on Optimizely, especially those working inside an AI coding client where the flag and the code change belong to the same task. Authentication uses an Optimizely API token scoped to a project, so what an agent can read or modify follows the account's existing permissions rather than a blanket key.

The paywall experimentation platform for mobile apps, enabling no-code paywalls, A/B testing, and business analytics.

Superwall is a comprehensive platform designed for mobile app developers and growth teams to build, deploy, and optimize paywalls without writing code. It provides an intuitive drag-and-drop paywall editor, allowing users to create native-feeling monetization screens that perfectly match their brand. The platform supports advanced targeting based on user behavior and demographics, enabling personalized paywall experiences. Beyond design, Superwall offers robust A/B testing capabilities to experiment with different paywall variations and track their performance. It integrates with open-source SDKs for iOS, Android, React Native, and Flutter, making implementation straightforward. The platform also includes unified subscriber management, real-time revenue tracking, and access to a gallery of over 200 proven paywall templates to accelerate launch and improve conversion rates. It empowers non-technical teams to iterate on monetization strategies quickly, reducing reliance on engineering resources.