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10 emulators 1,251 tests

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

What changed in the suite this run

Suite on

Kumo joins the board, suggested by @exoego. It is a Go emulator covering 82 AWS services, of which DynamoDB is one, and it runs from a container image or a single binary with nothing else to install.

The board's separate support and capability pages are now one emulator directory, with each project's feature and operation support in a single entry.

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. Dynoxide
    1.2.1 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
    0.2%Divergence
    98.9%Coverage

    low divergence (0.2%) in 22 regions · up to 0.5% in the other 11

    unchanged
    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 0.5% diverges
    100.0% covered
    Also built for WebAssembly / OPFS
    • WebAssembly / OPFS
      Grade A

      low divergence (0.2%) in 16 regions · up to 0.5% in the other 17 · covers 88.8%

  3. Ministack
    62c0ac878ea8 52 unsupported ; covers 95.8% of the suite

    Runs via: pip, Docker, source

    Grade B
    7.1%Divergence
    95.8%Coverage

    moderate divergence (7.1%) in 6 regions · up to 7.3% in the other 27

    unchanged
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 0.3% diverges
    89.6% covered 36 unsupported
    Tier 3 · Strict 21.5% diverges
    96.1% covered 16 unsupported
  4. ExtendDB
    v0.1.12 267 unsupported ; covers 78.7% of the suite

    Runs via: source

    Grade B
    1.8%Divergence
    78.7%Coverage

    low divergence (1.8%) in 16 regions · up to 2.2% in the other 17

    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 5.6% diverges
    90.7% covered 38 unsupported
    Also built for SQLite
    • SQLite
      Grade B

      low divergence (2.1%) in 16 regions · up to 2.4% in the other 17 · covers 82.8% · coverage lowers this row to B

  5. LocalStack
    2026.8.3 59 unsupported ; covers 95.3% of the suite

    Runs via: Docker, pip, Homebrew, binary

    Grade B
    8.1%Divergence
    95.3%Coverage

    moderate divergence (8.1%) in 1 region · up to 8.3% in the other 32

    unchanged
    Tier breakdown
    Tier 1 · Core 2.8% diverges
    100.0% covered
    Tier 2 · Complete 12.5% diverges
    87.5% covered 43 unsupported
    Tier 3 · Strict 10.7% diverges
    96.1% covered 16 unsupported
  6. Floci
    f5aa8c18302c 59 unsupported ; covers 95.3% of the suite

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

    Grade C
    15.0%Divergence
    95.3%Coverage

    high divergence (15.0%) in 16 regions · up to 15.3% in the other 17

    diverged 11.8 percentage points less, grade D to C
    Tier breakdown
    Tier 1 · Core 0.0% diverges
    100.0% covered
    Tier 2 · Complete 27.5% diverges
    87.5% covered 43 unsupported
    Tier 3 · Strict 22.7% diverges
    96.1% covered 16 unsupported
  7. DynamoDB Local
    ff89bd48ff32 73 unsupported ; covers 94.2% of the suite

    Runs via: Docker, JAR, Maven

    Grade C
    15.7%Divergence
    94.2%Coverage

    high divergence (15.7%) in 16 regions · up to 15.7% in the other 17

    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 25.9% diverges
    96.1% covered 16 unsupported
  8. Dynalite
    4.0.0 386 unsupported ; covers 69.1% of the suite

    Runs via: npm, npx, embedded

    Grade C
    11.5%Divergence
    69.1%Coverage

    moderate divergence (11.5%) in 11 regions · up to 11.7% in the other 22

    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 15.4% diverges
    80.2% covered 81 unsupported
  9. Kumo
    07a1ad2616ef 272 unsupported ; covers 78.3% of the suite

    Runs via: Docker, binary, source

    Grade F
    45.2%Divergence
    78.3%Coverage

    severe divergence (45.2%) in 5 regions · up to 45.3% in the other 28

    new
    Tier breakdown
    Tier 1 · Core 47.2% diverges
    100.0% covered
    Tier 2 · Complete 13.9% diverges
    32.2% covered 234 unsupported
    Tier 3 · Strict 69.3% diverges
    90.7% covered 38 unsupported