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Vercel Flags automates progressive rollouts

·2026.05.11 17:00

Key point

Vercel Flags now supports progressive rollouts that increase traffic according to a schedule.

Details

Progressive rollouts have been added to Vercel Flags. Following a set schedule, the percentage of traffic sent to a new variant increases in stages, allowing regressions to be checked first with a small group of users.

  • weighted split is an experimentation method that maintains a fixed ratio, like 50/50.
  • Progressive rollouts set a target percentage and duration for each stage, automatically moving on to the next stage.
  • This feature is available on the dashboard, and can also be run via the new vercel flags rollout CLI command.

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