Amplitude vs Compose

Amplitude is a product analytics service with event tracking, conversion funnels, session recordings, and ecommerce tracking. It also provides API access and extended data retention. The platform is listed as API-based. Its Free plan costs nothing and includes up to 2M events per month, 10,000 monthly session replays, and 2,000 AI feedback records; it is billed free forever and requires no credit card. Plus is listed at free, with the first 2M events per month free and a credit card required. It supports up to 70M events, 20 behavioral cohorts, and two-year data retention. Amplitude, the maker, was founded in 2012 and is headquartered in San Francisco, California, United States.

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.