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LocalStack on

localstack.cloud github.com/localstack/localstack

2026.5.4 as measured in this run

Grade B
moderate divergence
answers 13.5% of the suite differently from real DynamoDB
98.9% covered · 8 unsupported
Tier 1 · Core 2.2% diverges
100.0% covered
8 of 366 attempted
Tier 2 · Complete 8.5% diverges
94.3% covered 8 unsupported
12 of 133 attempted
Tier 3 · Strict 34.5% diverges
100.0% covered
79 of 229 attempted

When this run was published the board led with a single correctness percentage. The figures here are that run's own results restated as divergence and coverage, so they read differently from what this page showed at the time. The changelog has the change.

How it got here

LocalStack's history up to this run, ending on the figures above. Both are plotted because neither reads correctly alone: divergence falls when a target stops attempting an operation it used to get wrong, so a fall in the first plot is only an improvement if the second one holds. The target's own page carries the full history.

Divergence

LocalStack divergence up to 2026-06-22 0% 10% 20% divergence - lower is better 24 Mar 25 Apr 23 May 25 May 29 May 16 Jun 19 Jun 22 Jun 13.5%
Diverging on 13.5% of the suite as of 22 Jun. Lower is better, so a falling line is a target getting closer to real DynamoDB.

Coverage

LocalStack coverage up to 2026-06-22 96% 98% 100% coverage - higher is better 24 Mar 25 Apr 23 May 25 May 29 May 16 Jun 19 Jun 22 Jun 98.9%
Implementing 98.9% of the suite as of 22 Jun, as little as 98.8% on 26 May. Higher is better. This is the share of the suite's tests a target implements at all. A fail becoming a skip leaves both numerators over the same fixed denominator, so a fall here is matched point for point by a fall in divergence: withdrawal costs exactly as much coverage as it gains divergence.

Where it fell short on this date

The tests this run recorded as failing, each linked to its source at the commit that measured it. For the current picture, see this target's latest results, or every target in this run.