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Independent DynamoDB conformance tests

How close is compatible?

DynamoDB emulators, put to the test. Explore what matches real AWS, what diverges, and what matters for your application.

Explore emulators How we measure

The conformance board

Latest results

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Divergence: tests answered differently from AWS. Coverage: tests implemented. Each emulator is scored against its closest matching region. How grades are worked out.

Suite
1,678 tests · checked against live AWS
last measured · how
Regions
33 real regions scored
1 unresolved, still trusted: me-central-1
1 dropped until it returns: me-south-1
How to read these results Grades, coverage & movement
A+0% at full coverage A<5% B<15% C<25% D<35% Fbeyond ▼ diverged less ▲ diverged more

Letters follow divergence over the whole suite, in each target's closest region; A+ means zero failing tests there, not a rounded 0.0%. Coverage can only lower a letter, never raise it: a third of whatever a target leaves unimplemented is added to its divergence before the bands are read.

Biggest moves: Kumo diverged 0.1 percentage points more
  1. Ministack
    b58186186515

    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

    unchanged
    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
  2. 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 21 regions · up to 3.2% in the other 12

    unchanged
    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 21 regions · up to 2.4% in the other 12 · covers 87.8% · coverage lowers this row to B

  3. 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 21 regions · up to 15.6% in the other 12

    C against 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
  4. 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

    unchanged
    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

  5. LocalStack
    2026.10.3 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
  6. 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 1 region · up to 24.8% in the other 32

    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
  7. 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 1 region · up to 12.8% in the other 32

    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
  8. Kumo
    7b15ae8b6e4b 508 unsupported ; covers 69.7% of the suite

    Runs via: Docker, binary, source

    Grade F
    43.9%Divergence
    69.7%Coverage

    severe divergence (43.9%) in 1 region · up to 44.4% in the other 32

    diverged 0.1 percentage points more
    Tier breakdown
    Tier 1 · Core 47.3% 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

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