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SNES 16-bit pixel art sky with a fluffy popcorn cloud (floccus) raining AWS service icons (S3, DynamoDB, Lambda) onto a pixel laptop, neon FLOCI sign above

Floci: a Free, Drop-in LocalStack Alternative Built on Quarkus

LocalStack Community froze in March 2026 and now asks for an auth token. Floci is the no-strings-attached replacement: a free, MIT-licensed, Quarkus-native local AWS emulator. I test it for real: AWS CLI, a real Lambda, two ways of wiring a Quarkus app (Dev Services and Testcontainers), and a LocalStack migration.

Quarkus Native on Knative cold start benchmark

Quarkus Native on Knative: 5x Faster Cold Start, 20x Less Memory

What does a 3-second cold start cost you in production? SLO breaches on every scale-from-zero event and 19x more cloud spend on memory. I benchmarked a real Quarkus app in containers and the numbers make the case.