The best A/B testing tools to use in 2026

suits developer-led teams needing self-hosted analytics, session replays, and feature flags to run robust A/B tests across web and backend. emphasizes fast, reliable experimentation with real-time analytics, targeting, and flag-driven rollouts. offers open-source flexibility and guardrails for safe releases, balancing simplicity with customizable experimentation—ideal for teams seeking control without sacrificing speed or clarity.