Why This Comparison Exists (And Why Most Are Useless)

The aws acm vs azure key vault vs google certificate manager decision comes down to three factors: lifecycle automation, integration boundaries, and what breaks at 3am — not feature checkboxes. With 47-day certificate lifetimes phasing in by March 2029 under CA/Browser Forum SC-081v3, the choice you make in 2026 will trigger roughly 8x more renewal events per year. Pick wrong and you're rebuilding inside 18 months.

Most cloud certificate management comparisons online fall into two buckets:

Vendor-sponsored fluff with no production scars

2019-era takes written before SC-081v3 was locked in

Feature checklists that miss operational reality

What those comparisons don't tell you:

ACM's CloudFront regional pin (us-east-1 only) still exists

Key Vault transactions get expensive when rotating 500 certs every six weeks

GCP Certificate Manager handles 47-day lifetimes well — only if your stack is 100% Google

In my experience running all three in production…