Assignment strategies

liftstack offers three traffic allocation strategies for distributing recipients across variants.

Random (equal split)

Each variant receives an equal share of traffic. This is the simplest approach and recommended for your first campaigns. Available on all tiers.

Manual allocation

Set custom percentages for each variant. Useful when you want to limit exposure to a risky variant or when regulatory requirements dictate allocation. Available on all tiers.

Thompson Sampling (Growth and Scale tiers)

An adaptive strategy that automatically shifts traffic toward better-performing variants while maintaining exploration of all options. Built-in guardrails ensure the control always receives at least 10% of traffic and no variant drops below 5%. Recommended after 2-3 campaigns with the same snippet, when you have prior performance data to work from.