Google Cloud SQL's free offering is a $300 credit trial for new customers, valid for 90 days, covering all features including CPU, memory, storage, networking, egress, licensing, and instance configuration. It functions as a full-featured evaluation window rather than a permanently limited free tier. Once credits expire, users move to On-Demand Pricing, which charges per resource consumed with no long-term commitment, or Committed Use Discounts requiring 1-year or 3-year commitments in exchange for lower rates. G2 reviewers note the trial is sufficient to evaluate Google Cloud SQL's capabilities, but the absence of a permanent free tier means ongoing costs begin immediately after the trial period ends.