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10 emulators 1,266 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 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
    f90981c85c9b

    Runs via: pip, Docker, source

    Grade A
    0.1%Divergence
    100.0%Coverage

    low divergence (0.1%) in 5 regions · up to 1.7% in the other 28

    diverged 6.6 percentage points less, grade B to A
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.3% diverges
    100.0% covered
    Tier 3 · Strict 0.0% diverges
    100.0% covered
  3. Floci
    e97cd0c1dc2a 7 unsupported ; covers 99.4% of the suite

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

    Grade A
    0.1%Divergence
    99.4%Coverage

    low divergence (0.1%) in 26 regions · up to 1.3% in the other 7

    unchanged
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    98.0% covered 7 unsupported
    Tier 3 · Strict 0.2% diverges
    100.0% covered
  4. Dynoxide
    1.3.0 14 unsupported ; covers 98.9% 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
    98.9%Coverage

    no divergence in 26 regions · up to 1.2% in the other 7

    coverage lowers this row to A

    diverged 0.8 percentage points less
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    95.9% covered 14 unsupported
    Tier 3 · Strict 0.0% diverges
    100.0% covered
    Also built for WebAssembly / OPFS
    • WebAssembly / OPFS
      Grade A

      no divergence in 26 regions · up to 1.1% in the other 7 · covers 88.0% · coverage lowers this row to A

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

  5. LocalStack
    2026.9.1 54 unsupported ; covers 95.7% of the suite

    Runs via: Docker, pip, Homebrew, binary

    Grade A
    2.4%Divergence
    95.7%Coverage

    low divergence (2.4%) in 26 regions · up to 3.6% in the other 7

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

    unchanged
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 6.1% diverges
    89.0% covered 38 unsupported
    Tier 3 · Strict 2.4% diverges
    96.2% covered 16 unsupported
  6. ExtendDB
    v0.1.13 267 unsupported ; covers 78.9% of the suite

    Runs via: source

    Grade B
    1.8%Divergence
    78.9%Coverage

    low divergence (1.8%) in 26 regions · up to 2.2% in the other 7

    coverage lowers this row to B

    unchanged
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.0% diverges
    33.6% covered 229 unsupported
    Tier 3 · Strict 5.4% diverges
    91.1% covered 38 unsupported
    Also built for SQLite
    • SQLite
      Grade B

      low divergence (2.1%) in 26 regions · up to 2.4% in the other 7 · covers 83.0% · coverage lowers this row to B

  7. DynamoDB Local
    ff89bd48ff32 73 unsupported ; covers 94.2% of the suite

    Runs via: Docker, JAR, Maven

    Grade C
    14.7%Divergence
    94.2%Coverage

    moderate divergence (14.7%) in 2 regions · up to 15.6% in the other 31

    coverage lowers this row to C

    unchanged
    Tier breakdown
    Tier 1 · Core 7.5% diverges
    100.0% covered
    Tier 2 · Complete 15.4% diverges
    83.5% covered 57 unsupported
    Tier 3 · Strict 22.6% diverges
    96.2% covered 16 unsupported
  8. Dynalite
    4.0.0 398 unsupported ; covers 68.6% of the suite

    Runs via: npm, npx, embedded

    Grade C
    10.7%Divergence
    68.6%Coverage

    moderate divergence (10.7%) in 2 regions · up to 11.9% in the other 31

    coverage lowers this row to C

    unchanged
    Tier breakdown
    Tier 1 · Core 10.7% diverges
    100.0% covered
    Tier 2 · Complete 8.1% diverges
    11.6% covered 305 unsupported
    Tier 3 · Strict 12.9% diverges
    78.1% covered 93 unsupported
  9. Kumo
    76e97ef55735 271 unsupported ; covers 78.6% of the suite

    Runs via: Docker, binary, source

    Grade F
    44.7%Divergence
    78.6%Coverage

    severe divergence (44.7%) in 2 regions · up to 45.4% in the other 31

    diverged 0.2 percentage points less
    Tier breakdown
    Tier 1 · Core 46.8% diverges
    100.0% covered
    Tier 2 · Complete 13.9% diverges
    32.5% covered 233 unsupported
    Tier 3 · Strict 67.3% diverges
    91.1% covered 38 unsupported