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8 emulators 998 tests

Results as of this run. The arrow shows each target's movement since the previous run it was tested in.

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.

  1. DynamoDB
    live (AWS)

    Runs via: AWS service

    Grade baseline
    0.0%Divergence
    100.0%Coverage

    no divergence in all 32 regions

    ground truth
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    100.0% covered
    Tier 3 · Strict 0.0% diverges
    100.0% covered
  2. Dynoxide
    0.12.0 14 unsupported ; covers 98.6% of the suite

    Runs via: npx, Docker, Homebrew, binary, npm, cargo, embedded, GitHub Action, source

    Maintained by the board’s author

    Grade A
    0.0%Divergence
    98.6%Coverage

    no divergence in 6 regions · up to 0.3% in the other 27

    coverage lowers this row to A

    diverged 5.2 percentage points less
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    93.0% covered 14 unsupported
    Tier 3 · Strict 0.0% diverges
    100.0% covered
    Also built for WebAssembly / OPFS
    • WebAssembly / OPFS
      Grade B

      no divergence in 6 regions · up to 0.3% in the other 26 · covers 78.7% · coverage lowers this row to B

  3. ExtendDB
    v0.1.2 87 unsupported ; covers 91.3% of the suite

    Runs via: source

    Grade A
    1.6%Divergence
    91.3%Coverage

    low divergence (1.6%) in all 33 regions

    diverged 13.7 percentage points less
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 3.5% diverges
    58.3% covered 83 unsupported
    Tier 3 · Strict 2.8% diverges
    98.8% covered 4 unsupported
  4. LocalStack
    2026.7.0 8 unsupported ; covers 99.2% of the suite

    Runs via: Docker, pip, Homebrew, binary

    Grade C
    15.6%Divergence
    99.2%Coverage

    high divergence (15.6%) in 27 regions · up to 15.7% in the other 6

    diverged 0.1 percentage points less
    Tier breakdown
    Tier 1 · Core 6.5% diverges
    100.0% covered
    Tier 2 · Complete 18.1% diverges
    96.0% covered 8 unsupported
    Tier 3 · Strict 27.5% diverges
    100.0% covered
  5. DynamoDB Local
    d89f8fcc6b1a 21 unsupported ; covers 97.9% of the suite

    Runs via: Docker, JAR, Maven

    Grade C
    15.9%Divergence
    97.9%Coverage

    high divergence (15.9%) in 27 regions · up to 16.0% in the other 6

    diverged 0.9 percentage points less
    Tier breakdown
    Tier 1 · Core 7.8% diverges
    100.0% covered
    Tier 2 · Complete 16.1% diverges
    89.4% covered 21 unsupported
    Tier 3 · Strict 27.8% diverges
    100.0% covered
  6. Ministack
    c3c2e86f19ff

    Runs via: pip, Docker, source

    Grade C
    18.0%Divergence
    100.0%Coverage

    high divergence (18.0%) in all 33 regions

    unchanged
    Tier breakdown
    Tier 1 · Core 10.9% diverges
    100.0% covered
    Tier 2 · Complete 29.6% diverges
    100.0% covered
    Tier 3 · Strict 21.3% diverges
    100.0% covered
  7. Dynalite
    4.0.0 200 unsupported ; covers 80.0% of the suite

    Runs via: npm, npx, embedded

    Grade C
    12.3%Divergence
    80.0%Coverage

    moderate divergence (12.3%) in 27 regions · up to 12.5% in the other 6

    coverage lowers this row to C

    diverged 9.0 percentage points less
    Tier breakdown
    Tier 1 · Core 8.6% diverges
    100.0% covered
    Tier 2 · Complete 14.1% diverges
    20.1% covered 159 unsupported
    Tier 3 · Strict 16.7% diverges
    87.3% covered 41 unsupported
  8. Floci
    d2ecc8035822 9 unsupported ; covers 99.1% of the suite

    Runs via: Docker, Homebrew, install script, Scoop, binary, JAR

    Grade C
    20.9%Divergence
    99.1%Coverage

    high divergence (20.9%) in all 33 regions

    unchanged
    Tier breakdown
    Tier 1 · Core 8.6% diverges
    100.0% covered
    Tier 2 · Complete 36.7% diverges
    95.5% covered 9 unsupported
    Tier 3 · Strict 29.3% diverges
    100.0% covered