Sometimes I find myself starting a new Rails project, and almost immediately, I hit a wall: User Permissions.

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A practical comparison of the three main Rails authorization gems: CanCanCan, Pundit, and Action Policy. CanCanCan centralizes all permissions in one Ability class, which becomes unwieldy at scale. Pundit solves this with per-model Policy classes using plain Ruby objects, making testing easy but requiring boilerplate. Action Policy builds on Pundit's approach with a base class, built-in result caching, alias_rule helpers, and GraphQL integration. The recommendation: avoid CanCanCan for new projects, use Pundit for familiarity, or Action Policy for performance and less boilerplate in modern Rails 8 apps.

Pundit vs CanCanCan vs Action Policy: Which Rails Auth Gem Wins?

3. Action Policy (The Modern Speed Demon)