Experiment, optimize, and improve conversions on any part of your digital presence with feature experiments and roll them out behind feature flags without breaking user experience.
A/B test different indexing methods or search-as-a-service vendors to optimize your search infrastructure and achieve lower response times, relevant search results, and contextual autocomplete suggestions.
Experiment to determine the best analysis systems for thumbnails, such as aesthetic visual analysis (AVA), and improve your watch times
Analytically determine the best pricing tier options with different features of your business to hit the right spot between the number of subscriptions and the value of subscriptions.
Assess the right delivery or shipping fee to charge to your customers without impacting the top-line revenue of your business.
Experiment with different password policies at sign-up to enhance security without increasing user drop-offs during account creation.
Discover which two-factor authentication techniques are most preferred by your users for their logins.
Create release schedules according to your business requirements to ensure new features are open to specific target groups at the right time.
Automatically roll back features when a release affects your guardrail metrics negatively to keep the user experience intact.
Reliably assess whether your test variations are likely to outperform, underperform, or match the baseline with VWO's accurate, real-time Bayesian-stats-based reports that can handle peeking and multiple testing errors.
Share experiment reports via email links, export concise summaries or detailed reports as a CSV, and even print reports to facilitate collaboration.
Handpick any metric you wish to optimize, whether standard or custom, and even events from CDPs. Define the direction of improvement and the region of practical equivalence to get accurate conversion performance of each variation.
Next
Ensure your optimization experiments do not impact critical business KPIs negatively by enabling guardrail metrics. Automatically pause experiments when your guardrail metrics get negatively impacted.
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Filter experiment reports by default options, environments, or custom dimensions for actionable insights. Tailor report views and compare metrics for a complete analysis.
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Bayesian-powered Sequential SmartStats gives you precise, trustworthy results for each variation by assessing the likeliness of the variation to outperform, underperform, or match the baseline.
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You can choose any variation as the baseline and disable variations in campaigns when necessary to get results faster.
NextOptimize every part of your digital presence with data-driven experiment results, refine your offerings, and progressively roll out features.
Lightweight SDKs in 8+ languages that support both front-end and back-end to enable optimization of key metrics that impact any part of your tech stack.
Use as many projects, environments, and feature flags as needed to scale your optimization program and confidently ship complex features.
Reliable Bayesian-stats-based, environment-specific reports without traffic from bot user agents and malicious IPs that give you clear, unpolluted decisions.
Release enhancements to targeted groups first, validate functionality, and only then expand to 100% audience.
VWO offers lightweight SDKs that are easy to integrate and enable cross-platform optimization at high speeds.
Our range of open-source SDKs supports both front-end and back-end optimization and can be quickly initialized by your dev team.
View SDK RecipesSDKs execute API decisions without requiring any external calls to ensure minimum latency and maximum speed.
Learn moreDetailed developer documentation for each SDK and specific methods within SDKs that ensure you rarely face roadblocks.
View SDKsOur SDKs maintain uniformity for users within campaigns, ensuring they consistently experience the same test variation once they become part of a campaign.
How SDKs workOur range of open-source SDKs supports both front-end and back-end optimization and can be quickly initialized by your dev team.
View SDK Recipes
//Import the VWO Node SDK to use its features for server-side A/B testing and tracking.const vwoSDK = require('vwo-node-sdk');
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationconst settingsFile = await vwoSDK.getSettingsFile(accountId, sdkKey)
// Initialize the VWO SDK instance with the fetched settings file.const vwoClientInstance = vwoSDK.launch({settingsFile // The settings file obtained from VWO servers.});
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.const variationName = vwoClientInstance.activate(campaignKey, userId);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwoClientInstance.track(campaignKey, userId, goalIdentifier);
//Import the VWO PHP SDK to use its features for server-side A/B testing and tracking.require_once('vendor/autoload.php');use vwo\VWO;
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operation$settingsFile = VWO::getSettingsFile(accountId, sdkKey)$sdkConfig = ['settingsFile' => $settingsFile];
// Initialize the VWO SDK instance with the fetched settings file.$vwoClientInstance = newVWO($sdkConfig) // The settings file obtained from VWO servers.
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.$variationName = $vwoClientInstance->activate($campaignKey, $userId, $options);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.$vwoClientInstance->track($campaignKey, $userId, $goalIdentifier, $options);
//Import the VWO Python SDK to use its features for server-side A/B testing and tracking.import vwo
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationsettings_file = vwo.get_settings_file(account_id, sdk_key)
// Initialize the VWO SDK instance with the fetched settings file.vwo_client_instance = vwo.launch(settings_file)// The settings file obtained from VWO servers.
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.variation_name = vwo_client_instance.activate(campaign_key, user_id);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwo_client_instance.track(campaign_key, user_id, goal_identifeir);
//Import the VWO Javascript SDK to use its features for server-side A/B testing and tracking.const vwoSDK = require('vwo-node-sdk');
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationconst settingsFile = await vwoSDK.getSettingsFile(accountId, sdkKey)
// Initialize the VWO SDK instance with the fetched settings file.const vwoClientInstance = vwoSDK.launch({settingsFile // The settings file obtained from VWO servers.});
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.const variationName = vwoClientInstance.activate(campaignKey, userId);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwoClientInstance.track(campaignKey, userId, goalIdentifier);
//Import the VWO .Net SDK to use its features for server-side A/B testing and tracking.cusing VWOSdk;
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationSettings settingsFile = VWO.GetSettings(accountId, sdkKey)
// Initialize the VWO SDK instance with the fetched settings file.IVWOClient vwoClientInstance = VWO.Launch(settingsFile);public static Dictionary options = new Dictionary(){};
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.string variationName = vwoClientInstance.Activate(campaignKey, userId, options);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwoClientInstance.Track(campaignKey, userId, goalIdentifier, options);
//Import the VWO Java SDK to use its features for server-side A/B testing and tracking.import com.vwo.VWO;
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationString settingsFile = VWO.getSettingsFile(accountId, sdkKey)
// Initialize the VWO SDK instance with the fetched settings file.VWO vwoClientInstance = VWO.launch(settingsFile).build();// The settings file obtained from VWO servers.
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.String variationName = vwoClientInstance.activate(campaignKey, userId, options);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwoClientInstance.track(campaignKey, userId, goalIdentifier, options);
//Import the VWO Ruby SDK to use its features for server-side A/B testing and tracking.require 'vwo'
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationvwo_client_instance = VWO.new(config['account_id'], config['sdk_key'], nil, nil, false)
// Initialize the VWO SDK instance with the fetched settings file.options = {}
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.variation_name = vwo_client_instance.activate(campaign_key, user_id, options);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwo_client_instance.track(campaign_key, user_id, goal_identifier, options);
//Import the VWO GO SDK to use its features for server-side A/B testing and tracking.import vwo "github.com/wingify/vwo-go-sdk"
// Asynchronously fetch the settings file from VWO servers using your account ID and SDK key.// The settings file contains all the campaign configurations and is essential for the SDK's operationsettingsFile := vwo.GetSettingsFile("accountId", "SDKKey")
// Initialize the VWO SDK instance with the fetched settings file.vwoClientInstance, err := vwo.Launch(settingsFile) // The settings file obtained from VWO servers.
// Activate a specific campaign for a user. This determines which variation of the campaign the user should see. The method returns the name of the variation assigned to the user.variationName = vwoClientInstance.Activate(campaignKey, userId, options);
// Track a conversion (or goal achievement) for a user in a campaign. It is used to record when a user performs a significant action, like making a purchase or clicking a button, contributing to the campaign's success metrics.vwoClientInstance.Track(campaignKey, userId, goalIdentifier, options);
SDKs execute API decisions without requiring any external calls to ensure minimum latency and maximum speed.
Learn more
Detailed developer documentation for each SDK and specific methods within SDKs that ensure you rarely face roadblocks.
View SDKs
Our SDKs maintain uniformity for users within campaigns, ensuring they consistently experience the same test variation once they become part of a campaign.
How SDKs work
VWO offers you the flexibility and sophistication to run comprehensive feature campaigns and improve conversions.
Detection of unused flags in the code base and alerting with exact repository the flag was found to nudge the deletion of such flags. Integrates with CI/CD pipeline including Jenkins.
Enable hybrid testing with SDKs that support both front-end and back-end to enable tracking client-side metrics on your server-side campaigns as well.
Seamlessly integrate behavior analytics with server-side campaigns such as feature tests and rollouts to understand visitor behavior specific to experiment variations.
Exclude visitors involved in server-side product experiments from your client-side tests and vice versa to streamline your experiments.
Initialize SDKs and get started with feature experiments in minutes. VWO's support for as many projects and environments as you need makes scaling experimentation a breeze.
Create any feature optimization campaign in a jiffy with a simple, easy-to-use UI
Create any server-side optimization campaign in a jiffy with a simple, easy-to-use UI
Create functional capabilities of your product that you wish to optimize and roll out.
Test and iterate feature values with ease behind flags for each variable. Discover winning combinations of values and roll them out with ease.
Hard code complex logic and tailor A/B/n test variations to specific requirements with precise control. Analytically determine the better variation with ease.
Choose the metrics you want to optimize, and define the direction of improvement and region of practical equivalence to configure minimum conversion uplift. Add the relevant code snippet to your code base to start tracking the metric. You can even create custom metrics or import events from CDPs like Data360 or Segment.
Explore metrics
Segment your experiment audience with laser precision using any data - custom variables, OS, behavior, and even third-party events. Craft complex segments using logical operators (AND, OR) and parentheses, save them and repeat your targeting magic across campaigns.
Explore audience selection
VWO’s enhanced SmartStats - Bayesian powered sequential testing engine empowers your experimentation with unparalleled flexibility. Get the likeliness of each variation to outperform or underperform the baseline. Use report filters for segment-specific analysis and easily toggle between environment-specific and overall reporting.
Explore VWO Reports
Roll out feature enhancements in a phased manner to a selected audience. Assess the impact of the release and release the feature to 100% of users after ensuring there are no code breaks or performance issues.
VWO offers integration with tools spanning different categories such as analytics, CMS, call tracking, Data Warehousing, Customer Data Platform (CDP), e-commerce, marketing, productivity, and storage services.
Import events from external sources, such as customer data platforms, and use them in your optimization campaigns.
Run feature optimization campaigns on headless CMS such as Contenful seamlessly.
Send experimentation data seamlessly using our SDK's callback functions (Node.js) and class methods (Python, Ruby, etc) to analytics tools like Google Analytics, Mixpanel, Amplitude, data warehouses like Amazon Redshift, Google BigQuery, Snowflake, and CDP systems like Segment.com, mParticle.
API-based integrations for your custom applications.
“The VWO-Contentful Integration was the biggest feature that appealed to us. We previously used engineering resources to launch every server-side A/B test. Given our team's large ambitions and limited engineering resources, we could only launch ~1 test every 14-20 days. With the VWO-Contentful integration, we removed the engineering dependency for setting up and launching front-end experiments.”Growth Product Manager at Human Interest
Human Interest used zero-latency server-side testing to improve conversions on lead forms
Customer StoryVWO empowers you to run tests on web, mobile app and feature.
Pair Testing with our end-to-end experience optimization platform to enable a data-driven experimentation culture in your business.
Build a pipeline of high-impact experimentation ideas, collaborate efficiently, and see them to completion. Build a Kanban board workflow with observations to feed your testing and personalization campaigns. Add team members without restrictions and run your optimization program like a breeze.
Explore VWO Plan
Work confidently, knowing that we have always got your back for your security and support. Build and scale your testing programs with ease.
We value our customers' trust in our platform. Hence, we try our best to comply with security and privacy mandates across physical and digital geographies.
Explore Privacy & Security
Enhance VWO account security with two-factor authentication at the user or workspace level using authenticator apps or email passcodes.
VWO has data centers in the US, the EU (Belgium), and India. Our CDN uses a load balancer, is hosted on Google Cloud Platform, and spans 10 locations from Japan to Brazil for faster loading.
Leverage our training programs and dedicated success manager to optimize your website for better conversions.
You can count on us all year round for your most minor query while running the most complex experiments. Our technical experts will guide you all year round.
Log into VWO securely and conveniently using SAML 2.0-based single sign-on via identity providers like Google, Azure Cloud, OneLogin, Okta, and others.
Get Sub-accounts and varying levels of user permissions to bifurcate testing for client/agency and role division for the enterprise.
Free for 30 days. No credit card required
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We're satisfied and glad we picked VWO. We're getting the ROI from our experiments.
Christoffer Kjellberg CRO Manager
VWO has been so helpful in our optimization efforts. Testing opportunities are endless and it has allowed us to easily identify, set up, and run multiple tests at a time.
Elizabeth Levitan Digital Optimization Specialist
As the project manager for our experimentation process, I love how the functionality of VWO allows us to get up and going quickly but also gives us the flexibility to be more complex with our testing.
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You don't need a website development background to make VWO work for you. The VWO support team is amazing
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