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LocalStack on

localstack.cloud github.com/localstack/localstack

2026.6.3 as measured in this run

Grade C
moderate divergence · coverage lowers this row to C
answers 14.8% of the suite differently from real DynamoDB
99.2% covered · 8 unsupported
Tier 1 · Core 6.5% diverges
100.0% covered
31 of 475 attempted
Tier 2 · Complete 13.7% diverges
95.6% covered 8 unsupported
25 of 175 attempted
Tier 3 · Strict 27.5% diverges
100.0% covered
89 of 324 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 2026-07-21 0% 10% 20% divergence - lower is better 24 Mar 27 Apr 25 May 9 Jun 19 Jun 23 Jun 29 Jun 2 Jul 14 Jul 17 Jul 21 Jul 14.8%
Diverging on 14.8% of the suite as of 21 Jul, at worst 16.5% on 30 Jun. Lower is better, so a falling line is a target getting closer to real DynamoDB.

Coverage

LocalStack coverage up to 2026-07-21 96% 98% 100% coverage - higher is better 24 Mar 27 Apr 25 May 9 Jun 19 Jun 23 Jun 29 Jun 2 Jul 14 Jul 17 Jul 21 Jul 99.2%
Implementing 99.2% of the suite as of 21 Jul, 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.