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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
1,266 tests · checked against live AWS
last measured · how
Regions
33 real regions scored
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: Ministack diverged 6.6 percentage points less Dynoxide diverged 0.8 percentage points less Dynoxide (wasm) diverged 0.2 percentage points less
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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

  6. 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
  7. 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
  8. 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

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