TL;DR: For a small e-commerce team comparing an experiment across tenant cohorts, choose the platform that makes a rollback obvious before you optimize targeting depth. LaunchDarkly is the strongest fit when real-time updates and polished documentation justify a paid service. Flagsmith is the better fit when on-premise hosting and control of data matter. ConfigCat and GrowthBook suit simpler hosted rollouts. A plain REST layer such as Infrai is worth considering when the experiment is one part of a wider backend and the main pain is keys, SDKs, and integration work; its flag system still needs a separate audit and evaluation story.

The decision is operational, not cosmetic. A flag that changes checkout behavior for 40 tenants needs a fast off switch, a cohort result you can inspect, and a record of who changed what. The first useful result should arrive before the team has built a second dashboard.

Rollback first.

Measure twice.

That short rule changes the evaluation.…