Data Maestro vs Tonic Structural

Data Maestro is a local Mac app for generating synthetic data, anonymizing personally identifiable information, seeding databases, and serving a mock REST API. Its generator provides more than 75 field types across five locales, with consistent related values, repeatable seeded output, and streaming or parallel processing for millions of rows. A scanner detects emails, phone numbers, SSNs, credit cards, and IP addresses; masking can preserve formats and relationships across live database tables. Connectors span relational, document, and other databases, while imports include common file types, schemas, and API specifications. More than 30 export formats are listed, including SQL dialects, Parquet, Avro, BSON, and OpenAI fine-tuning JSONL. The mock server can return JSON, XML, or CSV and supports pagination, custom headers, CORS, and OpenAPI import. The maker says processing happens locally and saved connections, templates, and datasets are encrypted at rest; license activation and update checks make network calls. The native app requires macOS 14 or later on Apple Silicon. After the 30-day full trial, the free tier limits exports or database pushes to 100 rows and saved connections to two.

Tonic Structural has no write-up on Specifiction yet; its figures are above.