Compose vs Experimently

Compose is a pay-as-you-go web platform for A/B testing and conversion rate optimization. It supports A/B/n, split URL, split theme, and split template tests, with custom goals, audiences, triggers, and traffic allocation. A visual editor and audience targeting are available for building and directing experiments. For planning, teams can use a shared hypothesis backlog, PIE prioritization, and an experimentation roadmap. Reports update in real time and include frequentist statistical calculations; GA4 and BigQuery integrations are listed. Shopify users can create no-code experiments on themes and templates through Shopify’s editor. Compose says its client-side testing uses AWS Lambda@Edge for speed and to avoid flicker. The product lists unlimited experiments, variations, collaborators, and projects. You can explore it without charge until launching a first experiment, but there is no traditional free trial. The Early Adopter Plan is $0.00 per month, billed at $0.0012 per monthly tested user, with usage billed monthly for the prior month. Server-side testing is not available.

Experimently is an open-source experimentation platform for A/B testing and feature flags that runs on infrastructure you manage. Its Free Preview costs nothing when self-hosted on your AWS account, with all features included; there is no hosted tier. The platform supports A/B and multivariate tests, sequential testing, CUPED, multi-armed bandits, Bayesian testing, split URL testing and LLM/model evaluation. Rollout controls include sticky assignment, staged rollouts, mutual-exclusion groups, a global holdout and automatic rollback based on error-rate and latency thresholds. Targeting offers more than 20 operators, while analysis includes frequentist and Bayesian methods, sequential mSPRT and segment breakdowns with Bonferroni correction. SDKs are listed for many programming languages and mobile platforms, but the maker says they are not yet on package registries; installation directions are in each guide. Deployment options include Docker Compose, Kubernetes through Helm, or an AWS CDK app for services in your AWS account. Assignment data stays on your infrastructure. Integrations include data platforms, business tools and email. The platform lists security and compliance features including role-based access control, SSO and audit logging.