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10 emulators 1,678 tests

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

Scored against 33 real regions. 1 unresolved this sweep, still trusted: me-central-1 1 dropped, out of scoring until it returns: me-south-1
  1. DynamoDB
    live (AWS)

    Runs via: AWS service

    Grade baseline
    0.0%Divergence
    100.0%Coverage

    no divergence in all 33 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. Ministack
    c3afdc0f5a51

    Runs via: pip, Docker, source

    Grade A
    0.1%Divergence
    100.0%Coverage

    low divergence (0.1%) in 11 regions · up to 1.0% in the other 22

    diverged 21.5 percentage points less, grade C to A
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.2% diverges
    100.0% covered
    Tier 3 · Strict 0.0% diverges
    100.0% covered
  3. Dynoxide
    1.5.0 14 unsupported ; covers 99.2% of the suite

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

    Maintained by the board’s author

    Grade A
    2.0%Divergence
    99.2%Coverage

    low divergence (2.0%) in 20 regions · up to 3.2% in the other 13

    diverged 0.2 percentage points less
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    96.9% covered 14 unsupported
    Tier 3 · Strict 4.7% diverges
    100.0% covered
    Also built for WebAssembly / OPFS
    • WebAssembly / OPFS
      Grade B

      low divergence (1.3%) in 20 regions · up to 2.4% in the other 13 · covers 87.8% · coverage lowers this row to B

  4. Floci
    e0b292df4dc9 7 unsupported ; covers 99.6% of the suite

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

    Grade B
    14.4%Divergence
    99.6%Coverage

    moderate divergence (14.4%) in 20 regions · up to 15.6% in the other 13

    C against eu-south-2 and me-central-1, where real DynamoDB answers some tests differently

    unchanged
    Tier breakdown
    Tier 1 · Core 0.2% diverges
    100.0% covered
    Tier 2 · Complete 6.2% diverges
    98.5% covered 7 unsupported
    Tier 3 · Strict 29.2% diverges
    100.0% covered
  5. ExtendDB
    v0.1.14 504 unsupported ; covers 70.0% of the suite

    Runs via: source

    Grade C
    10.1%Divergence
    70.0%Coverage

    moderate divergence (10.1%) in 11 regions · up to 10.4% in the other 22

    coverage lowers this row to C

    diverged 0.1 percentage points less
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 2.7% diverges
    28.8% covered 322 unsupported
    Tier 3 · Strict 21.7% diverges
    75.0% covered 182 unsupported
    Also built for SQLite
    • SQLite
      Grade C

      moderate divergence (10.6%) in 11 regions · up to 10.9% in the other 22 · covers 73.4% · coverage lowers this row to C

  6. LocalStack
    2026.10.2 73 unsupported ; covers 95.6% of the suite

    Runs via: Docker, pip, Homebrew, binary

    Grade C
    19.5%Divergence
    95.6%Coverage

    high divergence (19.5%) in 11 regions · up to 20.4% in the other 22

    unchanged
    Tier breakdown
    Tier 1 · Core 0.2% diverges
    100.0% covered
    Tier 2 · Complete 13.5% diverges
    89.6% covered 47 unsupported
    Tier 3 · Strict 36.5% diverges
    96.4% covered 26 unsupported
  7. DynamoDB Local
    6ada631ec7aa 79 unsupported ; covers 95.3% of the suite

    Runs via: Docker, JAR, Maven

    Grade D
    24.1%Divergence
    95.3%Coverage

    high divergence (24.1%) in 2 regions · up to 24.8% in the other 31

    coverage lowers this row to D

    unchanged
    Tier breakdown
    Tier 1 · Core 7.6% diverges
    100.0% covered
    Tier 2 · Complete 11.9% diverges
    86.5% covered 61 unsupported
    Tier 3 · Strict 42.8% diverges
    97.5% covered 18 unsupported
  8. Dynalite
    4.0.0 707 unsupported ; covers 57.9% of the suite

    Runs via: npm, npx, embedded

    Grade D
    11.9%Divergence
    57.9%Coverage

    moderate divergence (11.9%) in 2 regions · up to 12.8% in the other 31

    coverage lowers this row to D

    unchanged
    Tier breakdown
    Tier 1 · Core 11.1% diverges
    100.0% covered
    Tier 2 · Complete 6.2% diverges
    8.8% covered 412 unsupported
    Tier 3 · Strict 16.0% diverges
    59.5% covered 295 unsupported
  9. Kumo
    7b15ae8b6e4b 508 unsupported ; covers 69.7% of the suite

    Runs via: Docker, binary, source

    Grade F
    43.7%Divergence
    69.7%Coverage

    severe divergence (43.7%) in 2 regions · up to 44.3% in the other 31

    diverged 0.1 percentage points less
    Tier breakdown
    Tier 1 · Core 46.9% diverges
    100.0% covered
    Tier 2 · Complete 13.1% diverges
    27.9% covered 326 unsupported
    Tier 3 · Strict 60.6% diverges
    75.0% covered 182 unsupported