MOSTLY AI review: the best open-source synthetic data company?

Answer in brief: MOSTLY AI, now branded MOSTLY AI powered by Syntho, gives AI teams an Apache 2.0 Synthetic Data SDK that runs locally with built-in differential privacy, plus an enterprise Data Intelligence Platform for synthetic, mock and simulated data. It is #10 in our data-sourcing ranking and the strongest choice for privacy-safe tabular data you can generate without sending it anywhere. Platform pricing is by demo only.

At a glance: Data-sourcing rank #10 of 14 · Segment: synthetic data · Best for: regulated tabular and text data · Pricing: free SDK; platform by demo.

What MOSTLY AI does for AI data buyers

The platform covers real-world data analyzed in place, mock data for prototyping, synthetic data that mimics real data without exposing records, and simulated data for edge cases. An AI assistant writes and runs Python against your data. The SDK uses MOSTLY AI's TabularARGN architecture, which the company says trains 100x faster.

Who it fits

Banks, insurers, telecoms and public bodies; data science teams wanting a local open-source workflow; and Databricks users sharing synthetic assets. For prompt-driven generation, compare Tonic.ai.

Why buyers shortlist it

• Open source and local. Apache 2.0, and data stays in your Python environment.
• Privacy built in. Differential privacy in the SDK.
• Customer proof. Swiss Post says synthetic data raised data access from 11% to 100% of its customer base; Erste Group uses synthetic data in every Databricks environment except production (testimonials on MOSTLY AI's site).
• Enterprise deployment on Kubernetes or OpenShift.

Honest drawbacks

• The terms of the Syntho combination are not disclosed.
• Platform pricing is not public.
• Focused on tabular and text, not images, video or sensors.
• It reports more than $31M in total historical funding, with no newer round in our sources.

Pricing model

Free open-source SDK; platform quoted by demo.

Best alternatives

• Tonic.ai: synthetic data with public prices.
• DatologyAI: synthetic rephrasing for corpora.
• Snowflake Marketplace: licensed real data.

FAQ

Is MOSTLY AI open source?

Its Synthetic Data SDK is open source under Apache 2.0 and runs locally.

What does powered by Syntho mean?

MOSTLY AI now brands itself MOSTLY AI powered by Syntho; its pages do not disclose the terms.

Does MOSTLY AI support differential privacy?

Yes. The SDK includes built-in differential privacy.

Sources

• MOSTLY AI powered by Syntho
• About MOSTLY AI

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