Native A/B testing on TikTok and Reels does not exist in the way a marketer expects. The platforms randomize per-user, not per-cohort. But you can still learn what works — iteratively.
Hold the body constant, vary the hook
For a two-week sprint, generate 3 hook variants per script while keeping the body identical. Publish one per day, in the same time slot, from the same account.
Measure completion, not views
Average view duration in the first 3 seconds is the cleanest hook signal. Views compound from the algorithm decision after that — completion in seconds 0–3 isolates the hook itself.
Lock the winning pattern
After 14 days you will see one or two hook patterns outperforming. Lock those as the default tone or template in your channel and rotate new variants against them.
How FeedReels speeds this up
The script step can produce multiple hook variants for the same article in one pass. The Avatar Studio lets you re-render only the first segment if you want to test a hook against an already-published body.