VWO FullStack
Server-side feature flagging, A/B testing, and experimentation platform
About VWO FullStack
VWO FullStack (now VWO Feature Management & Experimentation) is a server-side experimentation platform from Wingify that lets engineering and product teams deploy features independently of releases, run A/B tests on any platform, and deliver personalized experiences — all without deploying new code.
Pros & Cons
Pros
- Test anything server-side — not limited to browser or frontend experiments
- Broad SDK coverage across 10+ programming languages and platforms
- Part of the broader VWO ecosystem with Testing, Insights, and Personalization modules
- Fast and responsive customer support praised consistently in reviews
- Intuitive interface for creating and managing experiments
Cons
- Steep initial learning curve for advanced features and integrations
- VWO sells products separately — costs stack quickly as you add modules
- Some limitations in goal and funnel measurement on lower-tier plans
- Legacy FullStack branding can cause confusion with the newer FME rebrand
- Pricing scales with MTUs which can become expensive at high traffic volumes
Key Features
Feature Flags
Decouple deployment from release by turning features on or off at runtime without code changes
Progressive Rollouts
Release features to 1%, 10%, or 100% of users incrementally to manage risk
Server-Side A/B Testing
Test algorithms, search ranking, pricing logic, and checkout flows on the backend
Instant Rollback
Pause or revert feature releases immediately if metrics degrade with guarded releases
Advanced Targeting Rules
Target users by ID, device, OS, geography, feature flag status, or custom attributes
Personalization Rules
Deliver different feature variations to specific user segments for tailored experiences
Multi-Platform SDKs
Support for Node.js, PHP, Python, Go, Ruby, Java, iOS, Android, and more
Multi-Environment Support
Manage features across development, staging, and production environments
Multivariate Testing
Test multiple variables simultaneously to find optimal combinations on higher plans
REST API Integration
Full API access for programmatic feature management and experiment orchestration
Pricing
- Limited MTUs
- Basic feature flags
- Single environment
- Feature flags
- Basic targeting
- Progressive rollouts
- Multiple environments
- Everything in Growth
- Advanced targeting
- Multivariate testing
- Full API access
- Everything in Pro
- Unlimited metrics
- SSO
- Dedicated support
- SLA guarantees
Best For
E-commerce Experimentation
A/B test search algorithms, recommendation engines, and checkout flows to optimize conversion rates
SaaS Feature Rollouts
Gradually release new features to subscription users with percentage-based rollouts and instant rollback
Mobile App Feature Flags
Control feature availability on iOS and Android without waiting for app store review cycles
Backend Infrastructure Testing
Test database queries, API logic, and microservice changes safely with server-side experiments
Platform Migrations
Shift traffic slowly during major platform migrations with instant rollback if issues arise
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