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Best synthetic data generation tool

3 models · updated 2026-06-29

The verdict

Gretel leads — 2 of 3 models rank Gretel the top startup.

Not unanimous: Gemini picks Tonic.

Combined ranking

  1. 1
    Gretel—14 pts
    GPT #1Claude #1Gemini #2· Best developer-first APIs for privacy-preserving synthetic tabular and text data.
  2. 2
    MOSTLY AI—7 pts
    GPT —Claude #2Gemini #3· Best-in-class tabular synthetic data with an open-sourced SDK and high fidelity.
  3. 3
    Tonic.ai—7 pts
    GPT #2Claude #3Gemini —· Strong production workflow for realistic, de-identified test data.
  4. 4
    Tonic—5 pts
    GPT —Claude —Gemini #1· Powerful database-consistent generation and data masking for secure test environments.
  5. 5
    YData—4 pts
    GPT —Claude #4Gemini #4· Strong data-centric platform pairing synthetic generation with quality profiling for ML teams.
  6. 6
    Synthesized—3 pts
    GPT #4Claude #5Gemini —· Excellent for QA-ready synthetic data and database testing pipelines.
  7. 7
    Mostly AI—3 pts
    GPT #3Claude —Gemini —· Mature enterprise synthetic data platform with strong privacy controls.
  8. 8
    Synthetic Data Vault—1 pts
    GPT —Claude —Gemini #5· Leading open-source Python framework for multi-table synthetic data.

Not ranked (incumbents): NVIDIA Omniverse Replicator

By model

ChatGPT

  1. 1.Gretel
  2. 2.Tonic.ai
  3. 3.Mostly AI
  4. 4.Synthesized
  5. 5.NVIDIA Omniverse Replicator

Claude

  1. 1.Gretel
  2. 2.MOSTLY AI
  3. 3.Tonic.ai
  4. 4.YData
  5. 5.Synthesized

Gemini

  1. 1.Tonic
  2. 2.Gretel
  3. 3.MOSTLY AI
  4. 4.YData
  5. 5.Synthetic Data Vault

Tracked by ModelsAgree · rank 1 = 5 pts … rank 5 = 1 pt · re-polled continuously